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* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
 
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
 
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The pgpool.net server will be shut down for maintenance work
 
The pgpool.net server will be shut down for maintenance work
from 04:00 JST (UTC+0900) to 21:00 JST (UTC+0900), Sat, 16 November 2020.
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from 12:00 JST (UTC+0900) to 13:00 JST (UTC+0900), Tue, 28 May 2024.
 
All services on pgpool.net will be unavailable for the maintenance period.
 
All services on pgpool.net will be unavailable for the maintenance period.
 
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Sorry for inconvenience.
 
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The pgpool.net server will be shut down for maintenance work
 
The pgpool.net server will be shut down for maintenance work
from 11:00 JST (UTC+0900) to 13:00 JST (UTC+0900), Thu, 26 November 2020.
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from 12:00 JST (UTC+0900) to 13:00 JST (UTC+0900), Tuesday, June 28, 2022.
 
All services on pgpool.net will be unavailable for the maintenance period.
 
All services on pgpool.net will be unavailable for the maintenance period.
 
Sorry for inconvenience.
 
Sorry for inconvenience.
 
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: In memory query cache allows to save a pair of SELECT statement and its result. If an identical SELECTs comes in, Pgpool-II returns the value from cache. Since no SQL parsing nor access to PostgreSQL are involved, using in memory cache is extremely fast. On the other hand, it might be slower than the normal path in some cases, because it adds some overhead of storing cache data.  
 
: In memory query cache allows to save a pair of SELECT statement and its result. If an identical SELECTs comes in, Pgpool-II returns the value from cache. Since no SQL parsing nor access to PostgreSQL are involved, using in memory cache is extremely fast. On the other hand, it might be slower than the normal path in some cases, because it adds some overhead of storing cache data.  
  
Pgpool-II speaks PostgreSQL's backend and frontend protocol, and relays messages between a backend and a frontend. Therefore, a database application (frontend) thinks that Pgpool-II is the actual PostgreSQL server, and the server (backend) sees Pgpool-II as one of its clients. Because Pgpool-II is transparent to both the server and the client, an existing database application can be used with Pgpool-II almost without a
+
Pgpool-II speaks PostgreSQL's backend and frontend protocol, and relays messages between a backend and a frontend. Therefore, a database application (frontend) thinks that Pgpool-II is the actual PostgreSQL server, and the server (backend) sees Pgpool-II as one of its clients. Because Pgpool-II is transparent to both the server and the client, an existing database application can be used with Pgpool-II almost without a change to its sources.
 
 
Pgpool-II talks PostgreSQL's backend and frontend protocol, and relays a connection between them. Therefore, a database application (frontend) thinks that Pgpool-II is the actual PostgreSQL server, and the server (backend) sees Pgpool-II as one of its clients. Because Pgpool-II is transparent to both the server and the client, an existing database application can be used with Pgpool-II almost without a change to its sources.
 
  
 
== Pgpool-II License ==
 
== Pgpool-II License ==
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== Stable versions ==
 
== Stable versions ==
  
* Pgpool-II: 4.2, 4.1, 4.0, 3.7, 3.6
+
* Pgpool-II: 4.5, 4.4, 4.3, 4.2, 4.1
* pgpoolAdmin: 4.2, 4.1, 4.0, 3.7, 3.6
 
  
 
== Contacts ==
 
== Contacts ==
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* If you have technical questions regarding Pgpool-II, please subscribe [https://pgpool.net/mediawiki/index.php/Mailing_lists Pgpool-II mailing lists] and send questions to it (pgpool-general will be a starter). Please '''do not''' send technical questions via private email. We will not respond such that messages.
 
* If you have technical questions regarding Pgpool-II, please subscribe [https://pgpool.net/mediawiki/index.php/Mailing_lists Pgpool-II mailing lists] and send questions to it (pgpool-general will be a starter). Please '''do not''' send technical questions via private email. We will not respond such that messages.
  
* If you believe that you found a vulnerability/security issues with Pgpool-II, please send a '''private email''' to ishii at sraoss.co.jp (he is the project leader).
+
* If you believe that you found a vulnerability/security issues with Pgpool-II, please send a '''private email''' to ishii at postgresql.org (he is the project leader).
  
 
= What's new =
 
= What's new =
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== News ==
 
== News ==
  
=== Pgpool-II 4.3 beta1 released (2021/11/09) ===
+
=== Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 officially released (2024/09/09) ===
 
 
Pgpool-II 4.3 beta1 is now released.
 
  
Note that this is not a stable version but just for developers.
+
Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 officially released.
  
V4.3 contains new features and enhancements, including:
+
This release contains a security fix.  
* A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
 
  
* Allow to choose the least replication delay standby node when selecting the load balance node.  
+
When the query cache feature is enabled, it was possible that a database user can read rows from tables that should not be visible for the user through query cache (CVE-2024-45624).
  
* Allow to specify the node id to be promoted in pcp_promote_node.  
+
All versions of Pgpool-II older than 4.5.4, 4.4.9, 4.3.12, 4.2.19, 4.1.22, and all older versions that has the query cache feature (the query cache feature was implemented in 3.2) are affected by the vulnerability.
 +
It is strongly recommend to upgrade to Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 or later. Or you should better turn off the query cache feature.  
  
* Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.  
+
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
+
* 4.5.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-5-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-5-4.html Japanese]
 
+
* 4.4.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-9.html Japanese]
* Allow pcp_node_info to list all backend nodes information.
+
* 4.3.12 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-12.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-12.html Japanese]
 
+
* 4.2.19 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-19.html Japanese]
* Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
+
* 4.1.22 : [https://www.pgpool.net/docs/latest/en/html/release-4-1-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-22.html Japanese]
 
 
* Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.  
 
 
 
* Add support for log time stamp with milliseconds.
 
 
 
* Import PostgreSQL 14's SQL parser.
 
 
 
* Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
 
 
 
* pgpool.conf sample files are unified into single sample file for easier configuration.
 
 
 
* All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.
 
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
 
Release notes:
 
[https://www.pgpool.net/docs/43/en/html/release-4-3-0.html English]
 
  
 
== Events ==
 
== Events ==
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We had the very first time pgpool-II decicated conference. See the [https://pgpool.net/mediawiki/index.php/pgpool-II_Day_2015 event report].
 
We had the very first time pgpool-II decicated conference. See the [https://pgpool.net/mediawiki/index.php/pgpool-II_Day_2015 event report].
  
== New docs ==
+
== Stable ==
  
=== pgpool-II 3.5 is coming soon! ===
+
=== Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 officially released (2024/09/09) ===
  
pgpool-II 3.5 alpha1 has been out. Tatsuo introduces [https://pgpool.net/mediawiki/index.php?title=pgpool-II_3.5_features&redirect=no "new features of pgpool-II 3.5."]
+
Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 officially released.
  
== Stable ==
+
This release contains a security fix.
  
=== Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released (2021/11/18) ===
+
When the query cache feature is enabled, it was possible that a database user can read rows from tables that should not be visible for the user through query cache (CVE-2024-45624).
  
Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released.
+
All versions of Pgpool-II older than 4.5.4, 4.4.9, 4.3.12, 4.2.19, 4.1.22, and all older versions that has the query cache feature (the query cache feature was implemented in 3.2) are affected by the vulnerability.
 +
It is strongly recommend to upgrade to Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 or later. Or you should better turn off the query cache feature.  
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 4.2.6 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-6.html Japanese]
+
* 4.5.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-5-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-5-4.html Japanese]
* 4.1.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-9.html Japanese]
+
* 4.4.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-9.html Japanese]
* 4.0.16 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-16.html Japanese]
+
* 4.3.12 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-12.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-12.html Japanese]
* 3.7.21 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-21.html Japanese]
+
* 4.2.19 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-19.html Japanese]
* 3.6.28 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-28.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-28.html Japanese]
+
* 4.1.22 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-22.html Japanese]
  
=== Pgpool-II 4.2.5 released (2021/09/14) ===
+
=== Pgpool-II 4.5.3, 4.4.8, 4.3.11, 4.2.18 and 4.1.21 officially released (2024/08/15) ===
  
Pgpool Global Development Group is pleased to announce the availability of Pgpool-II 4.2.5.
+
Pgpool-II 4.5.3, 4.4.8, 4.3.11, 4.2.18 and 4.1.21 officially released.
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 4.2.5 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-5.html Japanese]
+
* 4.5.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-5-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-5-3.html Japanese]
 +
* 4.4.8 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-8.html Japanese]
 +
* 4.3.11 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-11.html Japanese]
 +
* 4.2.18 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-18.html Japanese]
 +
* 4.1.21 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-21.html Japanese]
  
=== Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released (2021/08/05) ===
+
=== Pgpool-II 4.5.2, 4.4.7, 4.3.10, 4.2.17 and 4.1.20 officially released (2024/05/16) ===
  
Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released.
+
Pgpool-II 4.5.2, 4.4.7, 4.3.10, 4.2.17 and 4.1.20 officially released.
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 4.2.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-4.html Japanese]
+
* 4.5.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-5-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-5-2.html Japanese]
* 4.1.8 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-8.html Japanese]
+
* 4.4.7 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-7.html Japanese]
* 4.0.15 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-15.html Japanese]
+
* 4.3.10 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-10.html Japanese]
* 3.7.20 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-20.html Japanese]
+
* 4.2.17 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-17.html Japanese]
* 3.6.27 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-27.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-27.html Japanese]
+
* 4.1.20 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-20.html Japanese]
  
=== pgpoolAdmin 4.2.0 officially released (2021/06/17) ===
+
=== Pgpool-II 4.5.1, 4.4.6, 4.3.9, 4.2.16 and 4.1.19 officially released (2024/02/29) ===
  
pgpoolAdmin 4.2.0 officially released.
+
Pgpool-II 4.5.1, 4.4.6, 4.3.9, 4.2.16 and 4.1.19 officially released.
 
 
pgpoolAdmin 4.2.0 adds support for Pgpool-II 4.2.
 
Please take a look at [https://www.pgpool.net/docs/pgpoolAdmin/NEWS release notes].
 
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
=== Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released (2021/05/20) ===
+
* 4.5.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-5-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-5-1.html Japanese]
 +
* 4.4.6 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-6.html Japanese]
 +
* 4.3.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-9.html Japanese]
 +
* 4.2.16 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-16.html Japanese]
 +
* 4.1.19 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-19.html Japanese]
  
Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released.
+
=== Pgpool-II 4.5.0 released (2023/12/12) ===
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
Pgpool-II 4.5.0 is now released. This is the first stable release of Pgpool-II 4.5.x.  
  
* 4.2.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-3.html Japanese]
+
V4.5 contains new features and enhancements, including:
* 4.1.7 : [https://www.pgpool.net/docs/latest/en/html/release-4-1-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-7.html Japanese]
 
* 4.0.14 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-14.html Japanese]
 
* 3.7.19 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-19.html Japanese]
 
* 3.6.26 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-26.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-26.html Japanese]
 
  
=== Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released (2021/02/18) ===
+
* Allow to use more kind of multiple statements in a query string.
  
Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released.
+
* Allow to load balance PREPARE/EXECUTE/DEALLOCATE.  
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Allow to set delay_threshold_by_time in milliseconds.
  
* 4.2.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-2.html Japanese]
+
* Avoid session disconnection issue in failover/failback/backend error in some cases.
* 4.1.6 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-6.html Japanese]
 
* 4.0.13 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-13.html Japanese]
 
* 3.7.18 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-18.html Japanese]
 
* 3.6.25 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-25.html Japanese]
 
  
=== Pgpool-II 4.2.1 released (2020/12/23) ===
+
* Allow to route queries to a specific backend node for a specific user connection.
  
Pgpool-II 4.2.1 is now released.  
+
* Support multiple directories specification for pcp_socket_dir.
  
You can download them from [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Import PostgreSQL 16's SQL parser.  
  
* 4.2.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-1.html Japanese]
+
You can download it from [https://www.pgpool.net/mediawiki/index.php/Downloads here].
  
=== Pgpool-II 4.2.0 released (2020/11/26) ===
+
Release notes:
 +
[https://www.pgpool.net/docs/45/en/html/release-4-5-0.html English]
  
Pgpool-II 4.2.0 is now released.
+
=== Pgpool-II 4.4.5, 4.3.8, 4.2.15, 4.1.18 and 4.0.25 officially released (2023/11/30) ===
  
V4.2 contains new features and enhancements, including:
+
Pgpool-II 4.4.5, 4.3.8, 4.2.15, 4.1.18 and 4.0.25 officially released.
  
* Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.
+
Please note that 4.0.25 is the last release of the 4.0.x series.
  
* Implement logging_collector for easier log management.
+
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* Implement log_disconnections to collect disconnection logs.
+
* 4.4.5 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-5.html Japanese]
 +
* 4.3.8 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-8.html Japanese]
 +
* 4.2.15 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-15.html Japanese]
 +
* 4.1.18 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-18.html Japanese]
 +
* 4.0.25 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-25.html Japanese]
  
* Implement pg_enc and pg_md5 to allow to register multiple passwords at once.
+
=== Pgpool-II 4.4.4, 4.3.7, 4.2.14, 4.1.17 and 4.0.24 officially released (2023/08/17) ===
  
* Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.
+
Pgpool-II 4.4.4, 4.3.7, 4.2.14, 4.1.17 and 4.0.24 officially released.
  
* New PCP command pcp_reload_config is added.
+
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.
+
* 4.4.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-4.html Japanese]
 +
* 4.3.7 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-7.html Japanese]
 +
* 4.2.14 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-14.html Japanese]
 +
* 4.1.17 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-17.html Japanese]
 +
* 4.0.24 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-24.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-24.html Japanese]
  
* Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.
+
=== Pgpool-II 4.4.3, 4.3.6, 4.2.13, 4.1.16 and 4.0.23 officially released (2023/05/18) ===
  
* Support LDAP authentication between clients and Pgpool-II.
+
Pgpool-II 4.4.3, 4.3.6, 4.2.13, 4.1.16 and 4.0.23 officially released.
  
* Add ssl_crl_file and ssl_passphrase_command to SSL configuration.
+
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* Import PostgreSQL 13's SQL parser.  
+
* 4.4.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-3.html Japanese]
 +
* 4.3.6 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-6.html Japanese]
 +
* 4.2.13 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-13.html Japanese]
 +
* 4.1.16 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-16.html Japanese]
 +
* 4.0.23 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-23.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-23.html Japanese]
  
You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
+
=== End-of-Life (EOL) Announcement for pgpoolAdmin (2023/02/17) ===
  
Release notes:
+
Pgpool Global Development Group announces end-of-life date for pgpoolAdmin, which is the management tool for Pgpool-II.
[https://www.pgpool.net/docs/42/en/html/release-4-2-0.html English]
 
  
=== Pgpool-II 4.1.5, 4.0.12, 3.7.17, 3.6.24 and 3.5.28 officially released (2020/11/19) ===
+
Pgpool Global Development Group will provide maintenance for pgpoolAdmin 4.0, 4.1 and 4.2 until December 31, 2023.  
 +
After this date, bug fixes and security fixes for these versions will no longer be provided.
  
Pgpool-II 4.1.5, 4.0.12, 3.7.17, 3.6.24 and 3.5.28 officially released
+
In addition, pgpoolAdmin for Pgpool-II 4.3 or later will not be released.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
We would like to thank you for using pgpoolAdmin over the years.
  
* 4.1.5 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-5.html Japanese]
+
=== Pgpool-II 4.4.2, 4.3.5, 4.2.12, 4.1.15 and 4.0.22 officially released (2023/01/23) ===
* 4.0.12 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-12.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-12.html Japanese]
 
* 3.7.17 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-17.html Japanese]
 
* 3.6.24 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-24.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-24.html Japanese]
 
* 3.5.28 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-28.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-28.html Japanese]
 
  
=== Pgpool-II 4.1.4, 4.0.11, 3.7.16, 3.6.23 and 3.5.27 officially released (2020/09/17) ===
+
Pgpool-II 4.4.2, 4.3.5, 4.2.12, 4.1.15 and 4.0.22 officially released.
  
Pgpool-II 4.1.4, 4.0.11, 3.7.16, 3.6.23 and 3.5.27 officially released
+
This release contains a security fix.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
If following conditions are all met, the password of "wd_lifecheck_user" is exposed by "SHOW POOL STATUS" command.
 +
The command can be executed by any user who can connect to Pgpool-II. (CVE-2023-22332)
 +
* Version 3.3 or later
 +
* use_watchdog = on
 +
* wd_lifecheck_method = 'query'
 +
* A plain text password is set to wd_lifecheck_password
  
* 4.1.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-4.html Japanese]
+
In this case it is strongly recommended to upgrade to this version (we do not expose wd_lifecheck_password in show pool_status command any more), or use one of following workarounds.
* 4.0.11 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-11.html Japanese]
 
* 3.7.16 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-16.html Japanese]
 
* 3.6.23 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-23.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-23.html Japanese]
 
* 3.5.27 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-27.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-27.html Japanese]
 
  
=== Pgpool-II 4.1.3, 4.0.10, 3.7.15, 3.6.22 and 3.5.26 officially released (2020/08/20) ===
+
Workarounds for 4.0.x to 4.4.x users:
 +
* Disable watchdog. Set use_watchdog to off.
 +
* Change wd_lifecheck_method to heartbeat.
 +
* Set an empty string to wd_lifecheck_password. This will use password in the pool_passwd file.
 +
* Set an AES encrypted password to wd_lifecheck_password.  
  
Pgpool-II 4.1.3, 4.0.10, 3.7.15, 3.6.22 and 3.5.26 officially released
+
In any case we recommend to change "wd_lifecheck_password" in PostgreSQL.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
Workarounds for 3.0.x to 3.7.x users:
 +
* Disable watchdog. Set use_watchdog to off.
 +
* Change wd_lifecheck_method to heartbeat.  
  
* 4.1.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-3.html Japanese]
+
In any case we recommend to change "wd_lifecheck_password" in PostgreSQL.
* 4.0.10 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-10.html Japanese]
 
* 3.7.15 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-15.html Japanese]
 
* 3.6.22 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-22.html Japanese]
 
* 3.5.26 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-26.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-26.html Japanese]
 
 
 
=== Pgpool-II 4.1.2, 4.0.9, 3.7.14, 3.6.21 and 3.5.25 officially released (2020/05/21) ===
 
  
Pgpool-II 4.1.2, 4.0.9, 3.7.14, 3.6.21 and 3.5.25 officially released
+
Please note that Pgpool-II 3.7.x or before are end of life and no minor updates are provided for those versions.  
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 4.1.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-2.html Japanese]
+
* 4.4.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-2.html Japanese]
* 4.0.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-9.html Japanese]
+
* 4.3.5 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-5.html Japanese]
* 3.7.14 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-14.html Japanese]
+
* 4.2.12 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-12.html Japanese]
* 3.6.21 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-21.html Japanese]
+
* 4.1.15 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-15.html Japanese]
* 3.5.25 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-25.html Japanese]
+
* 4.0.22 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-22.html Japanese]
  
=== Pgpool-II 4.1.1, 4.0.8, 3.7.13, 3.6.20, 3.5.24 and pgpoolAdmin 4.1.0 officially released (2020/02/20) ===
+
=== Pgpool-II 4.4.1, 4.3.4, 4.2.11, 4.1.14, 4.0.21 and 3.7.26 officially released (2022/12/22) ===
  
Pgpool-II 4.1.1, 4.0.8, 3.7.13, 3.6.20, 3.5.24 and pgpoolAdmin 4.1.0 officially released
+
Pgpool-II 4.4.1, 4.3.4, 4.2.11, 4.1.14, 4.0.21 and 3.7.26 officially released.
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 4.1.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-1.html Japanese]
+
* 4.4.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-4-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-4-1.html Japanese]
* 4.0.8 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-8.html Japanese]
+
* 4.3.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-4.html Japanese]
* 3.7.13 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-13.html Japanese]
+
* 4.2.11 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-11.html Japanese]
* 3.6.20 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-20.html Japanese]
+
* 4.1.14 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-14.html Japanese]
* 3.5.24 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-24.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-24.html Japanese]
+
* 4.0.21 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-21.html Japanese]
 +
* 3.7.26 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-26.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-26.html Japanese]
  
=== Pgpool-II 4.1.0, 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 RPMs Update 2 officially released (2019/11/19) ===
+
=== Pgpool-II 4.4.0 released (2022/12/06) ===
  
Pgpool-II 4.1.0, 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 RPMs Update 2 are officially released.
+
Pgpool-II 4.4.0 is now released. This is the first stable release of Pgpool-II 4.4.x.
The updated RPM packages fixed the bug which logs are not output, when log_destination = 'syslog' is configured.
 
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
V4.4 contains new features and enhancements, including:
  
=== Pgpool-II 4.1.0 released (2019/10/31) ===
+
* Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
  
Pgpool-II 4.1.0 is now relased.  
+
* Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
  
Major enhancements in Pgpool-II 4.1 include:
+
* As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
  
* Statement level load balancing.
+
* Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
* Auto failback.
 
* Enhance performance in number of areas.
 
** Shared relation cache allows to reuse relation cache among sessions to reduce internal queries against PostgreSQL system catalogs.
 
** Have separate SQL parser for DML statements to eliminate unnecessary parsing effort.
 
** Load balancing control for specific queries.
 
* Reduce Internal Queries against System Catalogs.
 
* Import PostgreSQL 12 SQL parser.
 
* etc.
 
  
You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
  
Release notes:
+
* Import PostgreSQL 15's SQL parser.
[https://www.pgpool.net/docs/latest/en/html/ English]
 
[https://www.pgpool.net/docs/latest/ja/html/ Japanese]
 
  
=== Pgpool-II 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 officially released (2019/10/31) ===
+
* Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.  
  
Pgpool-II 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 officially released
+
You can download it from [https://www.pgpool.net/mediawiki/index.php/Downloads here].
  
Please note that 3.4.26 is the last release of 3.4 series
+
Release notes:
because 5 years has passed since 3.4 was out (2014/11).
+
[https://www.pgpool.net/docs/44/en/html/release-4-4-0.html English] [https://www.pgpool.net/docs/44/ja/html/release-4-4-0.html Japanese]
 
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
  
* 4.0.7 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-6.html Japanese]
+
=== Pgpool-II 4.3.3, 4.2.10, 4.1.13, 4.0.20 and 3.7.25 officially released (2022/08/18) ===
* 3.7.12 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-11.html Japanese]
 
* 3.6.19 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-18.html Japanese]
 
* 3.5.23 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-22.html Japanese]
 
* 3.4.26:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-25.html Japanese]
 
  
=== Pgpool-II 4.0.6, 3.7.11, 3.6.18, 3.5.22 and 3.4.25 officially released (2019/08/15) ===
+
Pgpool-II 4.3.3, 4.2.10, 4.1.13, 4.0.20 and 3.7.25 officially released.
 
 
Pgpool-II 4.0.6, 3.7.11, 3.6.18, 3.5.22 and 3.4.25 officially released
 
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 4.0.6 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-6.html Japanese]
+
* 4.3.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-3.html Japanese]
* 3.7.11 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-11.html Japanese]
+
* 4.2.10 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-10.html Japanese]
* 3.6.18 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-18.html Japanese]
+
* 4.1.13 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-13.html Japanese]
* 3.5.22 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-22.html Japanese]
+
* 4.0.20 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-20.html Japanese]
* 3.4.25:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-25.html Japanese]
+
* 3.7.25 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-25.html Japanese]
  
=== Pgpool-II 4.0.5, 3.7.10, 3.6.17, 3.5.21 and 3.4.24 officially released (2019/05/16) ===
+
=== Pgpool-II 4.3.2, 4.2.9, 4.1.12, 4.0.19 and 3.7.24 officially released (2022/05/19) ===
  
Pgpool-II 4.0.5, 3.7.10, 3.6.17, 3.5.21 and 3.4.24 officially released
+
Pgpool-II 4.3.2, 4.2.9, 4.1.12, 4.0.19 and 3.7.24 officially released.
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 4.0.5 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-5.html Japanese]
+
* 4.3.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-2.html Japanese]
* 3.7.10 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-10.html Japanese]
+
* 4.2.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-9.html Japanese]
* 3.6.17 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-17.html Japanese]
+
* 4.1.12 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-12.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-12.html Japanese]
* 3.5.21 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-21.html Japanese]
+
* 4.0.19 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-19.html Japanese]
* 3.4.24:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-24.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-24.html Japanese]
+
* 3.7.24 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-24.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-24.html Japanese]
  
=== Pgpool-II 4.0.4, 3.7.9, 3.6.16, 3.5.20 and 3.4.23 officially released (2019/03/29) ===
+
=== Pgpool-II 4.3.1, 4.2.8, 4.1.11, 4.0.18 and 3.7.23 officially released (2022/02/17) ===
  
Pgpool-II 4.0.4, 3.7.9, 3.6.16, 3.5.20 and 3.4.23 officially released
+
Pgpool-II 4.3.1, 4.2.8, 4.1.11, 4.0.18 and 3.7.23 officially released.
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 4.0.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-4.html Japanese]
+
* 4.3.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-1.html Japanese]
* 3.7.9 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-9.html Japanese]
+
* 4.2.8 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-8.html Japanese]
* 3.6.16 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-16.html Japanese]
+
* 4.1.11 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-11.html Japanese]
* 3.5.20 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-20.html Japanese]
+
* 4.0.18 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-18.html Japanese]
* 3.4.23:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-23.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-23.html Japanese]
+
* 3.7.23 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-23.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-23.html Japanese]
  
=== Pgpool-II 4.0.3, 3.7.8, 3.6.15, 3.5.19 and 3.4.22 officially released (2019/02/21) ===
+
=== Pgpool-II 4.2.7, 4.1.10, 4.0.17 and 3.7.22 officially released (2021/12/23) ===
  
Pgpool-II 4.0.3, 3.7.8, 3.6.15, 3.5.19 and 3.4.22 officially released
+
Pgpool-II 4.2.7, 4.1.10, 4.0.17 and 3.7.22 officially released.
 +
 
 +
The purpose of this release is to provide packages for PostgreSQL 14.
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 4.0.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-3.html Japanese]
+
* 4.2.7 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-7.html Japanese]
* 3.7.8 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-8.html Japanese]
+
* 4.1.10 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-10.html Japanese]
* 3.6.15 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-15.html Japanese]
+
* 4.0.17 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-17.html Japanese]
* 3.5.19 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-19.html Japanese]
+
* 3.7.22 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-22.html Japanese]
* 3.4.22:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-22.html Japanese]
 
  
=== pgpoolAdmin 4.0.1 officially released (2018/12/20) ===
+
=== Pgpool-II 4.3.0 released (2021/12/07) ===
  
PgPool Global Development Group has released a Security Update of pgpoolAdmin.
+
Pgpool-II 4.3.0 is now released. Please take a look at [https://www.pgpool.net/docs/43/en/html/release-4-3-0.html 4.3.0]
  
The purpose of this release is to address CVE-2018-16203, which
+
V4.3.0 contains new features and enhancements, including:
allow an attacker to login without properly checking the authorization.
+
* A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
Once getting into gpoolAdmin, the attacker can control Pgpool-II.
 
Also it may be possible to obtain the superuser role of a PostgreSQL database.  
 
  
This vulnability affects all versions of pgpoolAdmin. We recommend
+
* Allow to choose the least replication delay standby node when selecting the load balance node.  
upgrade pgpoolAdmin to 4.0.1 immediately (remember that PgpoolAdmin
 
4.0.1 is compatible with Pgpool-II 3.4 or later).
 
  
PgPool Global Development Group would like to thank Fotios Rogkotis
+
* Allow to specify the node id to be promoted in pcp_promote_node.  
of DarkMatter for finding the security issue and giving us the
 
detailed studies on it.  
 
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.  
  
=== Pgpool-II 4.0.2, 3.7.7, 3.6.14, 3.5.18 and 3.4.21 officially released (2018/11/22) ===
+
* Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
  
Pgpool-II 4.0.2, 3.7.7, 3.6.14, 3.5.18 and 3.4.21 officially released
+
* Allow pcp_node_info to list all backend nodes information.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  
* 4.0.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-2.html Japanese]
+
* Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.  
* 3.7.7 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-7.html Japanese]
 
* 3.6.14 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-14.html Japanese]
 
* 3.5.18 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-18.html Japanese]
 
* 3.4.21:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-21.html Japanese]
 
  
=== Pgpool-II 4.0.1, 3.7.6, 3.6.13, 3.5.17 and 3.4.20 officially released (2018/10/31) ===
+
* Add support for log time stamp with milliseconds.
  
Pgpool-II 4.0.1, 3.7.6, 3.6.13, 3.5.17 and 3.4.20 officially released
+
* Import PostgreSQL 14's SQL parser.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
  
* 4.0.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-1.html Japanese]
+
* pgpool.conf sample files are unified into single sample file for easier configuration.
* 3.7.6 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-6.html Japanese]
 
* 3.6.13 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-13.html Japanese]
 
* 3.5.17 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-17.html Japanese]
 
* 3.4.20:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-20.html Japanese]
 
  
=== Pgpool-II 4.0.0 and pgpoolAdmin 4.0.0 officially released (2018/10/19) ===
+
* All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.
 
 
Pgpool-II 4.0.0 and pgpoolAdmin 4.0.0 are now relased.
 
 
 
V4.0 has new features:
 
 
 
* Add SCRAM and Certificate authentication support.
 
* Detecting "false" primary server of PostgreSQL.
 
* Improvements to load balancing:
 
** More load balancing fine control after write queries.
 
** Load balancing control for specific queries.
 
** Allow to specify load balance weight ratio for load balance parameters.
 
* Add last state change timestamp to SHOW POOL NODES.
 
* Import PostgreSQL 11 SQL parser.
 
* Logging client messages.
 
* etc.
 
  
 
You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
  
 
Release notes:
 
Release notes:
[https://www.pgpool.net/docs/latest/en/html/release-4-0.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0.html Japanese]
+
[https://www.pgpool.net/docs/43/en/html/release-4-3-0.html English]
  
=== Pgpool-II 3.7.5, 3.6.12, 3.5.16, 3.4.19 and 3.3.22 officially released (2018/07/31) ===
+
=== Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released (2021/11/18) ===
  
Pgpool-II 3.7.5, 3.6.12, 3.5.16, 3.4.19 and 3.3.22 officially released
+
Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released.
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.7.5 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-5.html Japanese]
+
* 4.2.6 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-6.html Japanese]
* 3.6.12 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-12.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-12.html Japanese]
+
* 4.1.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-9.html Japanese]
* 3.5.16 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-16.html Japanese]
+
* 4.0.16 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-16.html Japanese]
* 3.4.19:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-19.html Japanese]
+
* 3.7.21 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-21.html Japanese]
* 3.3.22:  [https://www.pgpool.net/docs/latest/en/html/release-3-3-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-22.html Japanese]
+
* 3.6.28 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-28.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-28.html Japanese]
  
Please note that 3.3.22 is the last release of 3.3 series because 5 years has passed since 3.3 was out (2013/07/30).
+
=== Pgpool-II 4.2.5 released (2021/09/14) ===
  
=== Pgpool-II 3.7.4, 3.6.11, 3.5.15 and 3.4.18 officially released (2018/06/12) ===
+
Pgpool Global Development Group is pleased to announce the availability of Pgpool-II 4.2.5.
 
 
Pgpool-II 3.7.4, 3.6.11, 3.5.15 and 3.4.18 officially released
 
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.7.4 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-4.html Japanese]
+
* 4.2.5 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-5.html Japanese]
* 3.6.11 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-11.html Japanese]
 
* 3.5.15 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-15.html Japanese]
 
* 3.4.18:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-18.html Japanese]
 
  
=== Pgpool-II 3.7.3, 3.6.10, 3.5.14, 3.4.17 and 3.3.21 officially released (2018/04/17) ===
+
=== Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released (2021/08/05) ===
  
Pgpool-II 3.7.3, 3.6.10, 3.5.14, 3.4.17 and 3.3.21 officially released
+
Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released.
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.7.3 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-3.html Japanese]
+
* 4.2.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-4.html Japanese]
* 3.6.10 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-10.html Japanese]
+
* 4.1.8 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-8.html Japanese]
* 3.5.14 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-14.html Japanese]
+
* 4.0.15 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-15.html Japanese]
* 3.4.17:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-17.html Japanese]
+
* 3.7.20 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-20.html Japanese]
* 3.3.21:  [https://www.pgpool.net/docs/latest/en/html/release-3-3-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-21.html Japanese]
+
* 3.6.27 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-27.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-27.html Japanese]
  
=== Pgpool-II 3.7.2-2 RPMs are released. (2018/03/14) ===
+
=== pgpoolAdmin 4.2.0 officially released (2021/06/17) ===
  
Pgpool-II 3.7.2-2 RPMs are released.
+
pgpoolAdmin 4.2.0 officially released.
 +
 
 +
pgpoolAdmin 4.2.0 adds support for Pgpool-II 4.2.
 +
Please take a look at [https://www.pgpool.net/docs/pgpoolAdmin/NEWS release notes].
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
=== Pgpool-II 3.7.2, 3.6.9, 3.5.13, 3.4.16 and 3.3.20 officially released (2018/02/13) ===
+
=== Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released (2021/05/20) ===
  
Pgpool-II 3.7.2, 3.6.9, 3.5.13, 3.4.16 and 3.3.20 officially released
+
Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released.
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.7.2 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-2.html Japanese]
+
* 4.2.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-3.html Japanese]
* 3.6.9 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-9.html Japanese]
+
* 4.1.7 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-7.html Japanese]
* 3.5.13 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-13.html Japanese]
+
* 4.0.14 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-14.html Japanese]
* 3.4.16:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-16.html Japanese]
+
* 3.7.19 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-19.html Japanese]
* 3.3.20:  [https://www.pgpool.net/docs/latest/en/html/release-3-3-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-20.html Japanese]
+
* 3.6.26 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-26.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-26.html Japanese]
  
=== pgpoolAdmin 3.7.1 officially released (2018/02/05) ===
+
=== Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released (2021/02/18) ===
  
pgpoolAdmin 3.7.1 is officially released.
+
Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released.
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
[https://www.pgpool.net/docs/pgpoolAdmin/NEWS Release notes]
+
* 4.2.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-2.html Japanese]
 +
* 4.1.6 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-6.html Japanese]
 +
* 4.0.13 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-13.html Japanese]
 +
* 3.7.18 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-18.html Japanese]
 +
* 3.6.25 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-25.html Japanese]
  
=== Pgpool-II 3.7.1, 3.6.8, 3.5.12, 3.4.15 and 3.3.19 officially released (2018/01/09) ===
+
=== Pgpool-II 4.2.1 released (2020/12/23) ===
  
Pgpool-II 3.7.1, 3.6.8, 3.5.12, 3.4.15 and 3.3.19 officially released
+
Pgpool-II 4.2.1 is now released.  
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
You can download them from [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.7.1 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-1.html Japanese]
+
* 4.2.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-1.html Japanese]
* 3.6.8 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-8.html Japanese]
 
* 3.5.12 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-12.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-12.html Japanese]
 
* 3.4.15:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-15.html Japanese]
 
* 3.3.19:  [https://www.pgpool.net/docs/latest/en/html/release-3-3-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-19.html Japanese]
 
  
=== Pgpool-II 3.7.0 and pgpoolAdmin 3.7.0 officially released (2017/11/22) ===
+
=== Pgpool-II 4.2.0 released (2020/11/26) ===
  
Pgpool-II 3.7.0 and pgpoolAdmin 3.7.0 are now relased.  
+
Pgpool-II 4.2.0 is now released.  
  
V3.7 has new features:
+
V4.2 contains new features and enhancements, including:
* Quorum aware failover feature.
 
* Allow specifying the hostnames in pool_hba.
 
* Allow to specify per node health check parameters.
 
* Support AWS Aurora.
 
* Import PostgreSQL 10 SQL parser.
 
* Support logical replication.
 
* etc.
 
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.
  
Release notes:
+
* Implement logging_collector for easier log management.
[https://www.pgpool.net/docs/latest/en/html/release-3-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7.html Japanese]
 
  
=== Pgpool-II 3.6.7, 3.5.11, 3.4.14 and 3.3.18 officially released (2017/11/01) ===
+
* Implement log_disconnections to collect disconnection logs.
  
Pgpool-II 3.6.7, 3.5.11, 3.4.14 and 3.3.18 officially released
+
* Implement pg_enc and pg_md5 to allow to register multiple passwords at once.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.
  
* 3.6.7 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-7.html Japanese]
+
* New PCP command pcp_reload_config is added.
* 3.5.11 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-11.html Japanese]
 
* 3.4.14:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-14.html Japanese]
 
* 3.3.18:  [https://www.pgpool.net/docs/latest/en/html/release-3-3-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-18.html Japanese]
 
  
=== Pgpool-II 3.6.6, 3.5.10, 3.4.13, 3.3.17 and 3.2.22 officially released (2017/09/05) ===
+
* Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.
  
Pgpool-II 3.6.6, 3.5.10, 3.4.13, 3.3.17, 3.2.22 and pgpoolAdmin 3.6.2 officially released
+
* Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Support LDAP authentication between clients and Pgpool-II.
  
* 3.6.6 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-6.html Japanese]
+
* Add ssl_crl_file and ssl_passphrase_command to SSL configuration.
* 3.5.10 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-10.html Japanese]
 
* 3.4.13:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-13.html Japanese]
 
* 3.3.17:  [https://www.pgpool.net/docs/latest/en/html/release-3-3-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-17.html Japanese]
 
* 3.2.22:  [https://www.pgpool.net/docs/latest/en/html/release-3-2-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-2-22.html Japanese]
 
  
=== Pgpool-II 3.6.5, 3.5.9, 3.4.12, 3.3.16 and 3.2.21 officially released (2017/07/11) ===
+
* Import PostgreSQL 13's SQL parser.  
  
Pgpool-II 3.6.5, 3.5.9, 3.4.12, 3.3.16 and 3.2.21 officially released
+
You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
Release notes:
 +
[https://www.pgpool.net/docs/42/en/html/release-4-2-0.html English]
  
* 3.6.5 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-5.html Japanese]
+
=== Pgpool-II 4.1.5, 4.0.12, 3.7.17, 3.6.24 and 3.5.28 officially released (2020/11/19) ===
* 3.5.9 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-9.html Japanese]
 
* 3.4.12:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-12.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-12.html Japanese]
 
* 3.3.16:  [https://www.pgpool.net/docs/latest/en/html/release-3-3-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-16.html Japanese]
 
* 3.2.21:  [https://www.pgpool.net/docs/latest/en/html/release-3-2-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-2-21.html Japanese]
 
  
=== Pgpool-II 3.6.4, 3.5.8 officially released (2017/05/11) ===
+
Pgpool-II 4.1.5, 4.0.12, 3.7.17, 3.6.24 and 3.5.28 officially released
 
 
Pgpool-II 3.6.4, 3.5.8 officially released
 
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.6.4:  [https://www.pgpool.net/docs/latest/en/html/release-3-6-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-4.html Japanese]
+
* 4.1.5 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-5.html Japanese]
* 3.5.8:  [https://www.pgpool.net/docs/latest/en/html/release-3-5-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-8.html Japanese]
+
* 4.0.12 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-12.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-12.html Japanese]
 +
* 3.7.17 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-17.html Japanese]
 +
* 3.6.24 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-24.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-24.html Japanese]
 +
* 3.5.28 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-28.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-28.html Japanese]
  
=== Pgpool-II 3.6.3, 3.5.7, 3.4.11, 3.3.15, 3.2.20 and pgpoolAdmin 3.6.1 officially released (2017/04/28) ===
+
=== Pgpool-II 4.1.4, 4.0.11, 3.7.16, 3.6.23 and 3.5.27 officially released (2020/09/17) ===
  
Pgpool-II 3.6.3, 3.5.7, 3.4.11, 3.3.15, 3.2.20 and pgpoolAdmin 3.6.1 officially released
+
Pgpool-II 4.1.4, 4.0.11, 3.7.16, 3.6.23 and 3.5.27 officially released
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.6.3:  [https://www.pgpool.net/docs/latest/en/html/release-3-6-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-3.html Japanese]
+
* 4.1.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-4.html Japanese]
* 3.5.7:  [https://www.pgpool.net/docs/latest/en/html/release-3-5-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-7.html Japanese]
+
* 4.0.11 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-11.html Japanese]
* 3.4.11:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-11.html Japanese]
+
* 3.7.16 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-16.html Japanese]
* 3.3.15:  [https://www.pgpool.net/docs/latest/ja/html/release-3-3-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-15.html Japanese]
+
* 3.6.23 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-23.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-23.html Japanese]
* 3.2.20:  [https://www.pgpool.net/docs/latest/ja/html/release-3-2-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-2-20.html Japanese]
+
* 3.5.27 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-27.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-27.html Japanese]
  
=== Pgpool-II 3.6.2, 3.5.6, 3.4.10, 3.3.14 and 3.2.19 officially released (2017/03/17) ===
+
=== Pgpool-II 4.1.3, 4.0.10, 3.7.15, 3.6.22 and 3.5.26 officially released (2020/08/20) ===
  
Pgpool-II 3.6.2, 3.5.6, 3.4.10, 3.3.14 and 3.2.19 officially released
+
Pgpool-II 4.1.3, 4.0.10, 3.7.15, 3.6.22 and 3.5.26 officially released
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.6.2:  [https://www.pgpool.net/docs/latest/en/html/release-3-6-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-2.html Japanese]
+
* 4.1.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-3.html Japanese]
* 3.5.6:  [https://www.pgpool.net/docs/latest/en/html/release-3-5-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-6.html Japanese]
+
* 4.0.10 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-10.html Japanese]
* 3.4.10:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-10.html Japanese]
+
* 3.7.15 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-15.html Japanese]
* 3.3.14:  [https://www.pgpool.net/docs/latest/ja/html/release-3-3-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-14.html Japanese]
+
* 3.6.22 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-22.html Japanese]
* 3.2.19:  [https://www.pgpool.net/docs/latest/ja/html/release-3-2-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-2-19.html Japanese]
+
* 3.5.26 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-26.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-26.html Japanese]
  
=== pgpoolAdmin 3.6.0 officially released (2017/02/28) ===
+
=== Pgpool-II 4.1.2, 4.0.9, 3.7.14, 3.6.21 and 3.5.25 officially released (2020/05/21) ===
  
pgpoolAdmin 3.6.0 is officially released.
+
Pgpool-II 4.1.2, 4.0.9, 3.7.14, 3.6.21 and 3.5.25 officially released
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
=== pgpool-II 3.6.1, 3.5.5, 3.4.9, 3.3.13, 3.2.18 and 3.1.21 officially released (2016/12/26) ===
+
* 4.1.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-2.html Japanese]
 +
* 4.0.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-9.html Japanese]
 +
* 3.7.14 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-14.html Japanese]
 +
* 3.6.21 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-21.html Japanese]
 +
* 3.5.25 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-25.html Japanese]
  
These are the latest stable versions of each major branches.  
+
=== Pgpool-II 4.1.1, 4.0.8, 3.7.13, 3.6.20, 3.5.24 and pgpoolAdmin 4.1.0 officially released (2020/02/20) ===
 +
 
 +
Pgpool-II 4.1.1, 4.0.8, 3.7.13, 3.6.20, 3.5.24 and pgpoolAdmin 4.1.0 officially released
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.6.1:  [https://www.pgpool.net/docs/latest/en/html/release-3-6-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-1.html Japanese]
+
* 4.1.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-1.html Japanese]
* 3.5.5:  [https://www.pgpool.net/docs/latest/en/html/release-3-5-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-5.html Japanese]
+
* 4.0.8 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-8.html Japanese]
* 3.4.9:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-9.html Japanese]
+
* 3.7.13 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-13.html Japanese]
* 3.3.13:  [https://www.pgpool.net/docs/latest/en/html/release-3-3-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-13.html Japanese]
+
* 3.6.20 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-20.html Japanese]
* 3.2.18:  [https://www.pgpool.net/docs/latest/en/html/release-3-2-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-2-18.html Japanese]
+
* 3.5.24 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-24.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-24.html Japanese]
* 3.1.21:  [https://www.pgpool.net/docs/latest/en/html/release-3-1-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-1-21.html Japanese]
 
  
pgpool-II 3.1.21 is the final release of the 3.1.x. This series has reached "End of Life", and is no longer maintained and does not receive any updates.  
+
=== Pgpool-II 4.1.0, 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 RPMs Update 2 officially released (2019/11/19) ===
  
=== pgpool-II 3.6.0 officially released (2016/11/21) ===
+
Pgpool-II 4.1.0, 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 RPMs Update 2 are officially released.
 
+
The updated RPM packages fixed the bug which logs are not output, when log_destination = 'syslog' is configured.
Pgpool-II 3.6.0 is now officially released.
 
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
V3.6's new features are:
+
=== Pgpool-II 4.1.0 released (2019/10/31) ===
  
* Improve the behavior of fail-over.
+
Pgpool-II 4.1.0 is now relased.  
* New PGPOOL SET command has been introduced.
 
* Watchdog is significantly enhanced.
 
* Handling of extended query protocol (e.g. used by Java applications) in streaming replication mode speeds up if many rows are returned in a result set.
 
* Import parser of PostgreSQL 9.6.
 
* In some cases pg_terminate_backend() now does not trigger a fail-over.
 
* Change documentation format from raw HTML to SGML.
 
* etc.
 
  
=== pgpool-II 3.5.4, 3.4.8, 3.3.12, 3.2.17 and 3.1.20 officially released (2016/08/31) ===
+
Major enhancements in Pgpool-II 4.1 include:
  
These are the latest stable versions of each major branches.  
+
* Statement level load balancing.
 +
* Auto failback.
 +
* Enhance performance in number of areas.
 +
** Shared relation cache allows to reuse relation cache among sessions to reduce internal queries against PostgreSQL system catalogs.
 +
** Have separate SQL parser for DML statements to eliminate unnecessary parsing effort.
 +
** Load balancing control for specific queries.
 +
* Reduce Internal Queries against System Catalogs.
 +
* Import PostgreSQL 12 SQL parser.
 +
* etc.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.5.4: [https://www.pgpool.net/docs/pgpool-II-3.5.4/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.5.4/doc/pgpool-ja.html#release3.5.4 Japanese]
+
Release notes:
* 3.4.8:  [https://www.pgpool.net/docs/pgpool-II-3.4.8/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.4.8/doc/pgpool-ja.html#release3.4.8 Japanese]
+
[https://www.pgpool.net/docs/latest/en/html/ English]
* 3.3.12:  [https://www.pgpool.net/docs/pgpool-II-3.3.12/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.3.12/doc/pgpool-ja.html#release3.3.12 Japanese]
+
[https://www.pgpool.net/docs/latest/ja/html/ Japanese]
* 3.2.17:  [https://www.pgpool.net/docs/pgpool-II-3.2.17/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.2.17/doc/pgpool-ja.html#release3.2.17 Japanese]
 
* 3.1.20: [https://www.pgpool.net/docs/pgpool-II-3.1.20/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.1.20/doc/pgpool-ja.html#release3.1.20 Japanese]
 
  
=== pgpool-II 3.5.3, 3.4.7, 3.3.11, 3.2.16, 3.1.19, and pgpoolAdmin 3.5.3 officially released (2016/06/17) ===
+
== Development ==
  
These are the latest stable versions of each major branches.  
+
=== Pgpool-II 4.5 RC1 released (2023/11/28) ===
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
Pgpool-II 4.5 RC1 is now released.  
  
* 3.5.3:  [https://www.pgpool.net/docs/pgpool-II-3.5.3/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.5.3/doc/pgpool-ja.html#release3.5.3 Japanese]
+
Note that this is not a stable version but just for developers.
* 3.4.7:  [https://www.pgpool.net/docs/pgpool-II-3.4.7/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.4.7/doc/pgpool-ja.html#release3.4.7 Japanese]
 
* 3.3.11:  [https://www.pgpool.net/docs/pgpool-II-3.3.11/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.3.11/doc/pgpool-ja.html#release3.3.11 Japanese]
 
* 3.2.16:  [https://www.pgpool.net/docs/pgpool-II-3.2.16/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.2.16/doc/pgpool-ja.html#release3.2.16 Japanese]
 
* 3.1.19: [https://www.pgpool.net/docs/pgpool-II-3.1.19/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.1.19/doc/pgpool-ja.html#release3.1.19 Japanese]
 
  
=== pgpool-II 3.5.2, 3.4.6, 3.3.10, 3.2.15, 3.1.18, and pgpoolAdmin 3.5.2 officially released (2016/04/26) ===
+
V4.5 contains new features and enhancements, including:
  
These are the latest stable versions of each major branches.  
+
* Allow to use multiple statements in a query string.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Allow to set delay_threshold_by_time in milliseconds.
  
* 3.5.2:  [https://www.pgpool.net/docs/pgpool-II-3.5.2/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.5.2/doc/pgpool-ja.html#release3.5.2 Japanese]
+
* Avoid session disconnection issue in failover/failback/backend error in some cases.
* 3.4.6:  [https://www.pgpool.net/docs/pgpool-II-3.4.6/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.4.6/doc/pgpool-ja.html#release3.4.6 Japanese]
 
* 3.3.10:  [https://www.pgpool.net/docs/pgpool-II-3.3.10/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.3.10/doc/pgpool-ja.html#release3.3.10 Japanese]
 
* 3.2.15:  [https://www.pgpool.net/docs/pgpool-II-3.2.15/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.2.15/doc/pgpool-ja.html#release3.2.15 Japanese]
 
* 3.1.18: [https://www.pgpool.net/docs/pgpool-II-3.1.18/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.1.18/doc/pgpool-ja.html#release3.1.18 Japanese]
 
  
=== pgpool-II 3.5.1, 3.4.5, 3.3.9, 3.2.14, 3.1.17, and pgpoolAdmin 3.5.1 officially released (2016/04/04) ===
+
* Allow to route queries to a specific backend node for a specific user connection.
  
These are the latest stable versions of each major branches.  
+
* Support multiple directories specification for pcp_socket_dir.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Import PostgreSQL 16's SQL parser.  
  
* 3.5.1:  [https://www.pgpool.net/docs/pgpool-II-3.5.1/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.5.1/doc/pgpool-ja.html#release3.5.1 Japanese]
+
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
* 3.4.5:  [https://www.pgpool.net/docs/pgpool-II-3.4.5/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.4.5/doc/pgpool-ja.html#release3.4.5 Japanese]
 
* 3.3.9:  [https://www.pgpool.net/docs/pgpool-II-3.3.9/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.3.9/doc/pgpool-ja.html#release3.3.9 Japanese]
 
* 3.2.14:  [https://www.pgpool.net/docs/pgpool-II-3.2.14/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.2.14/doc/pgpool-ja.html#release3.2.14 Japanese]
 
* 3.1.17: [https://www.pgpool.net/docs/pgpool-II-3.1.17/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.1.17/doc/pgpool-ja.html#release3.1.17 Japanese]
 
  
=== pgpool-II 3.4.4, 3.3.8, 3.2.13, 3.1.16, and 3.0.20 officially released (2016/02/05) ===
+
Release notes:
 +
[https://www.pgpool.net/docs/45/en/html/release-4-5-0.html English]
  
These are the latest stable versions of each major branches.  
+
=== Pgpool-II 4.5 beta1 released (2023/11/14) ===
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
Pgpool-II 4.5 beta1 is now released.  
  
* 3.4.4:  [https://www.pgpool.net/docs/pgpool-II-3.4.4/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.4.4/doc/pgpool-ja.html#release3.4.4 Japanese]
+
Note that this is not a stable version but just for developers.
* 3.3.8:  [https://www.pgpool.net/docs/pgpool-II-3.3.8/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.3.8/doc/pgpool-ja.html#release3.3.8 Japanese]
 
* 3.2.13:  [https://www.pgpool.net/docs/pgpool-II-3.2.13/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.2.13/doc/pgpool-ja.html#release3.2.13 Japanese]
 
* 3.1.16: [https://www.pgpool.net/docs/pgpool-II-3.1.16/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.1.16/doc/pgpool-ja.html#release3.1.16 Japanese]
 
* 3.0.20: [https://www.pgpool.net/docs/pgpool-II-3.0.20/doc/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.0.20/doc/pgpool-ja.html#release3.0.20 Japanese]
 
  
pgpool-II 3.0.20 is the final release of the 3.0.x. This series has reached "End of Life", and is no longer maintained and does not receive any updates.
+
V4.5 contains new features and enhancements, including:
  
=== pgpool-II 3.5.0 and pgpoolAdmin 3.5.0 officially released (2016/01/29) ===
+
* Allow to use multiple statements in a query string.
  
Pgpool-II 3.5.0 and pgpoolAdmin 3.5.0 are now officially released.
+
* Allow to set delay_threshold_by_time in milliseconds.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Avoid session disconnection issue in failover/failback/backend error in some cases.
  
 +
* Allow to route queries to a specific backend node for a specific user connection.
  
V3.5's new features are:
+
* Support multiple directories specification for pcp_socket_dir.
  
* Improved performance in extended query protocol
+
* Import PostgreSQL 16's SQL parser.  
* Overcoming the thundering herd problem
 
* watchdog feature enhancements to be more robust and adaptable
 
* PCP command enhancements
 
* Import PostgreSQL 9.5 parser
 
* etc.
 
  
Please see [https://pgpool.net/mediawiki/index.php?title=pgpool-II_3.5_features&redirect=no this] for details.
+
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
  
 +
Release notes:
 +
[https://www.pgpool.net/docs/45/en/html/release-4-5-0.html English]
  
3.5.0 release note:  [https://www.pgpool.net/docs/pgpool-II-3.5.0/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.5.0/doc/pgpool-ja.html#release3.5.0 Japanese]
+
=== Pgpool-II 4.4 RC1 released (2022/11/22) ===
  
=== pgpool-II 3.4.3, 3.3.7, 3.2.12, 3.1.15, and 3.0.19 officially released (2015/07/24) ===
+
Pgpool-II 4.4 RC1 is now released.  
  
These are the latest stable versions of each major branches.  
+
Note that this is not a stable version but just for developers.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
V4.4 contains new features and enhancements, including:
  
* 3.4.3:  [https://www.pgpool.net/docs/pgpool-II-3.4.3/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.4.3/doc/pgpool-ja.html#release3.4.3 Japanese]
+
* Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
* 3.3.7:  [https://www.pgpool.net/docs/pgpool-II-3.3.7/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.3.7/doc/pgpool-ja.html#release3.3.7 Japanese]
 
* 3.2.12:  [https://www.pgpool.net/docs/pgpool-II-3.2.12/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.2.12/doc/pgpool-ja.html#release3.2.12 Japanese]
 
* 3.1.15: [https://www.pgpool.net/docs/pgpool-II-3.1.15/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.1.15/doc/pgpool-ja.html#release3.1.15 Japanese]
 
* 3.0.19: [https://www.pgpool.net/docs/pgpool-II-3.0.19/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.0.19/doc/pgpool-ja.html#release3.0.19 Japanese]
 
  
 +
* Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
  
=== pgpool-II 3.4.2, 3.3.6, 3.2.11, 3.1.14, and 3.0.18 officially released (2015/04/08) ===
+
* As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
  
These are the latest stable versions of each major branches.  
+
* Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
  
* 3.4.2:  [https://www.pgpool.net/docs/pgpool-II-3.4.2/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.4.2/doc/pgpool-ja.html#release3.4.2 Japanese]
+
* Import PostgreSQL 15's SQL parser.
* 3.3.6:  [https://www.pgpool.net/docs/pgpool-II-3.3.6/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.3.6/doc/pgpool-ja.html#release3.3.6 Japanese]
 
* 3.2.11:  [https://www.pgpool.net/docs/pgpool-II-3.2.11/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.2.11/doc/pgpool-ja.html#release3.2.11 Japanese]
 
* 3.1.14: [https://www.pgpool.net/docs/pgpool-II-3.1.14/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.1.14/doc/pgpool-ja.html#release3.1.14 Japanese]
 
* 3.0.18: [https://www.pgpool.net/docs/pgpool-II-3.0.18/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.0.18/doc/pgpool-ja.html#release3.0.18 Japanese]
 
  
=== pgpool-II 3.4.1, 3.3.5, 3.2.10, 3.1.13, 3.0.17  and pgpoolAdmin 3.4.1 officially released (2015/02/05) ===
+
* Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.  
  
These are the latest stable versions of each major branches.  
+
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
Release notes:
 +
[https://www.pgpool.net/docs/44/en/html/release-4-4-0.html English]
  
* 3.4.1:  [https://www.pgpool.net/docs/pgpool-II-3.4.1/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.4.1/doc/pgpool-ja.html#release3.4.1 Japanese]
+
=== Pgpool-II 4.4 beta1 released (2022/11/14) ===
* 3.3.5:  [https://www.pgpool.net/docs/pgpool-II-3.3.5/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.3.5/doc/pgpool-ja.html#release3.3.5 Japanese]
 
* 3.2.10:  [https://www.pgpool.net/docs/pgpool-II-3.2.10/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.2.10/doc/pgpool-ja.html#release3.2.10 Japanese]
 
* 3.1.13: [https://www.pgpool.net/docs/pgpool-II-3.1.13/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.1.13/doc/pgpool-ja.html#release3.1.13 Japanese]
 
* 3.0.17: [https://www.pgpool.net/docs/pgpool-II-3.0.17/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.0.17/doc/pgpool-ja.html#release3.0.17 Japanese]
 
  
* pgpoolAdmin 3.4.1: [https://www.pgpool.net/docs/pgpoolAdmin-3.4.1/NEWS.txt English]
+
Pgpool-II 4.4 beta1 is now released.  
  
=== The pgpool-II official yum repository released (2014/12/16) ===
+
Note that this is not a stable version but just for developers.
  
PgPool Global Development Group announced the pgpool-II official yum repository.  
+
V4.4 contains new features and enhancements, including:
With this repository, you will be able to install or update pgpool-II and pgpoolAdmin etc. by using yum.
 
  
https://www.pgpool.net/yum/
+
* Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
  
The yum repository currently supports pgpool-II 3.3 or above with RHEL6 x86_64.  
+
* Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
  
See [[Yum Repository]] for detail.
+
* As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
  
=== pgpool-II 3.4.0 and pgpoolAdmin 3.4.0 officially released (2014/11/07) ===
+
* Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
  
Pgpool-II 3.4.0 is now officially released.
+
* Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Import PostgreSQL 15's SQL parser.
  
 +
* Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.
  
V3.4's new features are:
+
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
  
* Allow fine control of load balancing by using application name or database name
+
Release notes:
* New features about log output
+
[https://www.pgpool.net/docs/44/en/html/release-4-4-0.html English]
** Allow to print pgpool-II process names
 
**  Allow to control log verbosity like PostgreSQL
 
* SQL parser compatible with PostgreSQL 9.4
 
* Import PostgreSQL's memory manager and exception manager
 
* Support IPv6 address
 
* Reorganize source code tree
 
* etc.  
 
  
 +
=== Pgpool-II 4.3 RC1 released (2021/11/25) ===
  
* 3.4.0 release note:  [https://www.pgpool.net/docs/pgpool-II-3.4.0/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.4.0/doc/pgpool-ja.html#release3.4.0 Japanese]
+
Pgpool-II 4.3 RC1 is now released. Please take a look at [https://www.pgpool.net/docs/43/en/html/release-4-3rc1.html 4.3 RC1]
  
=== pgpool-II 3.3.4, 3.2.9, 3.1.12, and 3.0.16 are officially released (2014/09/05) ===
+
Note that this is not a stable version but just for developers.
  
These are the latest stable versions of each major branches.  
+
V4.3 contains new features and enhancements, including:
 +
* A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Allow to choose the least replication delay standby node when selecting the load balance node.  
  
* 3.3.4:  [https://www.pgpool.net/docs/pgpool-II-3.3.4/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.3.4/doc/pgpool-ja.html#release3.3.4 Japanese]
+
* Allow to specify the node id to be promoted in pcp_promote_node.  
* 3.2.9:  [https://www.pgpool.net/docs/pgpool-II-3.2.9/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.2.9/doc/pgpool-ja.html#release3.2.9 Japanese]
 
* 3.1.12: [https://www.pgpool.net/docs/pgpool-II-3.1.12/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.1.12/doc/pgpool-ja.html#release3.1.12 Japanese]
 
* 3.0.16: [https://www.pgpool.net/docs/pgpool-II-3.0.16/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.0.16/doc/pgpool-ja.html#release3.0.16 Japanese]
 
  
=== pgpool-ha 2.2 released (2014/04/01) ===
+
* Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.  
  
This is the latest stable version.
+
* Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads#pgpool-HA here].
+
* Allow pcp_node_info to list all backend nodes information.
  
 +
* Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  
=== pgpool-II 3.3.3, 3.2.8, 3.1.11, 3.0.15  and pgpoolAdmin 3.3.1 officially released (2014/03/24) ===
+
* Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.  
  
These are the latest stable versions of each major branches.  
+
* Add support for log time stamp with milliseconds.
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Import PostgreSQL 14's SQL parser.
  
* 3.3.3:  [https://www.pgpool.net/docs/pgpool-II-3.3.3/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.3.3/doc/pgpool-ja.html#release3.3.3 Japanese]
+
* Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
* 3.2.8:  [https://www.pgpool.net/docs/pgpool-II-3.2.8/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.2.8/doc/pgpool-ja.html#release3.2.8 Japanese]
 
* 3.1.11: [https://www.pgpool.net/docs/pgpool-II-3.1.11/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.1.11/doc/pgpool-ja.html#release3.1.11 Japanese]
 
* 3.0.15: [https://www.pgpool.net/docs/pgpool-II-3.0.15/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.0.15/doc/pgpool-ja.html#release3.0.15 Japanese]
 
  
* pgpoolAdmin 3.3.1: [https://www.pgpool.net/docs/pgpoolAdmin-3.3.1/NEWS.txt English]
+
* pgpool.conf sample files are unified into single sample file for easier configuration.
  
=== pgpool-II 3.2.7, 3.1.10, 3.0.14 officially released (2013/12/06) ===
+
* All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.
  
These are the latest stable versions of each major branches.  
+
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
Release notes:
 +
[https://www.pgpool.net/docs/43/en/html/release-4-3-0.html English]
  
* 3.2.7:  [https://www.pgpool.net/docs/pgpool-II-3.2.7/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.2.7/doc/pgpool-ja.html#release3.2.7 Japanese]
 
* 3.1.10: [https://www.pgpool.net/docs/pgpool-II-3.1.10/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.1.10/doc/pgpool-ja.html#release3.1.10 Japanese]
 
* 3.0.14: [https://www.pgpool.net/docs/pgpool-II-3.0.14/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.0.14/doc/pgpool-ja.html#release3.0.14 Japanese]
 
  
=== pgpool-II 3.3.2 officially released (2013/11/29) ===
+
=== Pgpool-II 4.3 beta2 released (2021/11/18) ===
  
These are the latest stable version of 3.3.
+
Pgpool-II 4.3 beta2 is now released. Please take a look at [https://www.pgpool.net/docs/43/en/html/release-4-3beta2.html 4.3 beta2]
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
Note that this is not a stable version but just for developers.
  
* 3.3.2: [https://www.pgpool.net/docs/pgpool-II-3.3.2/NEWS.txt English] [https://www.pgpool.net/docs/pgpool-II-3.3.2/doc/pgpool-ja.html#release3.0.7 Japanese]
+
V4.3 contains new features and enhancements, including:
 +
* A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
  
=== pgpool-II 3.3.1, 3.2.6, 3.1.9, 3.0.13 officially released (2013/09/06) ===
+
* Allow to choose the least replication delay standby node when selecting the load balance node.  
  
These are the latest stable versions of each major branches.  
+
* Allow to specify the node id to be promoted in pcp_promote_node.  
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.  
  
=== Missing regression test suite in pgpool-II 3.3.0.tar.gz (2013/07/31) ===
+
* Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
  
New regression test suite was not accidentally included in the pgpool-II 3.3.0.tar.gz tar ball.
+
* Allow pcp_node_info to list all backend nodes information.
You can get it from git repository or download from
 
[https://www.pgpool.net/download.php?f=regression-3.3.0.tar.gz here].
 
  
=== pgpool-II 3.3 and pgpoolAdmin 3.3 officially released (2013/07/30) ===
+
* Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  
Pgpool-II 3.3 is now officially released.
+
* Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.  
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* Add support for log time stamp with milliseconds.
  
V3.3's new features are:
+
* Import PostgreSQL 14's SQL parser.
  
* Enhancements for watchdog
+
* Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
** New monitoring method of watchdog lifecheck using heartbeat signal
 
** Interlocking of failover/failback script
 
** Secure watchdog communication
 
** PCP command for retrieving the watchdog status
 
** etc.  
 
* Othres
 
** Import PostgreSQL 9.2 raw parser
 
** New pgpool_setup tool
 
** Support for using CREATE EXTENSION to install pgpool specific extensions
 
** regression test suit
 
** etc.  
 
  
* [https://www.pgpool.net/docs/pgpool-II-3.3.0/NEWS.txt pgpool-II 3.3 release note (English)]
+
* pgpool.conf sample files are unified into single sample file for easier configuration.
* [https://www.pgpool.net/docs/pgpool-II-3.3.0/pgpool-ja.html#release3.3.0 pgpool-II 3.3 release note (Japanese)]
 
  
=== pgpool-II 3.2.5, 3.1.8, 3.0.12 officially released (2013/07/10) ===
+
* All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.
  
These are the latest stable versions of each major branches.  
+
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
Release notes:
 
+
[https://www.pgpool.net/docs/43/en/html/release-4-3-0.html English]
== Development ==
 
  
 
=== Pgpool-II 4.3 beta1 released (2021/11/09) ===
 
=== Pgpool-II 4.3 beta1 released (2021/11/09) ===
Line 1,090: Line 957:
 
Release notes:
 
Release notes:
 
[https://www.pgpool.net/docs/41/en/html/ English]
 
[https://www.pgpool.net/docs/41/en/html/ English]
 
=== Pgpool-II 4.0 RC1 released (2018/10/03) ===
 
 
Pgpool-II 4.0 RC1 is now released.
 
 
This is not intended to be used in production but is close to the release version. So users are encouraged to test it out.
 
 
V4.0 has new features:
 
 
* Add SCRAM and Certificate authentication support.
 
* Detecting "false" primary server of PostgreSQL.
 
* Improvements to load balancing:
 
** More load balancing fine control after write queries.
 
** Load balancing control for specific queries.
 
** Allow to specify load balance weight ratio for load balance parameters.
 
* Add last state change timestamp to SHOW POOL NODES.
 
* Import PostgreSQL 11 SQL parser.
 
* Logging client messages.
 
* etc.
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
Release notes:
 
[https://www.pgpool.net/docs/pgpool-II-4.0/en/html/release-4-0.html English]
 
 
=== Pgpool-II 4.0 beta1 released (2018/09/19) ===
 
 
Pgpool-II 4.0 beta1 is now released.
 
 
This is not a stable version but just for developers.
 
 
V4.0 has new features:
 
 
* Add SCRAM and Certificate authentication support.
 
* Detecting "false" primary server of PostgreSQL.
 
* Improvements to load balancing:
 
** More load balancing fine control after write queries.
 
** Load balancing control for specific queries.
 
** Allow to specify load balance weight ratio for load balance parameters.
 
* Add last state change timestamp to SHOW POOL NODES.
 
* Import PostgreSQL 11 SQL parser.
 
* Logging client messages.
 
* etc.
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
Release notes:
 
[https://www.pgpool.net/docs/pgpool-II-4.0/en/html/release-4-0.html English]
 
 
=== Pgpool-II 4.0 alpha2 released (2018/09/06) ===
 
 
Pgpool-II 4.0 alpha2 is now released.
 
 
This is not a stable version but just for developers.
 
 
V4.0 has new features:
 
 
* Add SCRAM and Certificate authentication support.
 
* Detecting "false" primary server of PostgreSQL.
 
* Improvements to load balancing:
 
** More load balancing fine control after write queries.
 
** Load balancing control for specific queries.
 
** Allow to specify load balance weight ratio for load balance parameters.
 
* Add last state change timestamp to SHOW POOL NODES.
 
* Import PostgreSQL 11 SQL parser.
 
* Logging client messages.
 
* etc.
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
Release notes:
 
[https://www.pgpool.net/docs/pgpool-II-4.0/en/html/release-4-0.html English]
 
 
=== Pgpool-II 4.0 alpha1 released (2018/08/20) ===
 
 
Pgpool-II 4.0 alpha1 is now released.
 
 
This is not a stable version but just for developers.
 
 
V4.0 has new features:
 
 
* Add SCRAM and Certificate authentication support.
 
* Detecting "false" primary server of PostgreSQL.
 
* Improvements to load balancing:
 
** More load balancing fine control after write queries.
 
** Load balancing control for specific queries.
 
** Allow to specify load balance weight ratio for load balance parameters.
 
* Add last state change timestamp to SHOW POOL NODES.
 
*Logging client messages.
 
* etc.
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
Release notes:
 
[https://www.pgpool.net/docs/pgpool-II-4.0/en/html/release-4-0.html English]
 
 
=== Pgpool-II 3.7 RC1 and pgpoolAdmin 3.7 RC1 released (2017/11/13) ===
 
 
Pgpool-II 3.7 RC1 and pgpoolAdmin 3.7 RC1 are now released.
 
 
This is not intended to be used in production but is close to the
 
release version. So users are encouraged to test it out.
 
 
V3.7 has new features:
 
* Quorum aware failover feature.
 
* Allow specifying the hostnames in pool_hba.
 
* Allow to specify per node health check parameters.
 
* Support AWS Aurora.
 
* Import PostgreSQL 10 SQL parser.
 
* Support logical replication.
 
* etc.
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
Release notes:
 
[https://www.pgpool.net/docs/pgpool-II-3.7.0/doc/en/html/release-3-7.html English] [https://www.pgpool.net/docs/pgpool-II-3.7.0/doc/ja/html/release-3-7.html Japanese]
 
 
=== Pgpool-II 3.7 beta1 released (2017/10/17) ===
 
 
Pgpool-II 3.7 beta1 is now released. This is not a stable version but just for developers.
 
 
V3.7 has new features:
 
* Quorum aware failover feature.
 
* Allow specifying the hostnames in pool_hba.
 
* Allow to specify per node health check parameters.
 
* Support AWS Aurora.
 
* Import PostgreSQL 10 SQL parser.
 
* Support logical replication.
 
* etc.
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.6 RC1 released (2016/11/16) ===
 
 
pgpool-II 3.6 RC1 is now released. This is not a stable version but just for developers.
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.6 beta2 released (2016/11/08) ===
 
 
pgpool-II 3.6 beta2 is now released. This is not a stable version but just for developers.
 
 
Users are encouraged to take part in our beta test program. Please help us in testing and making pgpool-II 3.6 better!
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.6 beta1 released (2016/11/02) ===
 
 
pgpool-II 3.6 beta1 is now released. This is not a stable version but just for developers.
 
 
Users are encouraged to take part in our beta test program. Please help us in testing and making pgpool-II 3.6 better!
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== Pgpool-II 3.6 alpha1 released (2016/10/19) ===
 
 
Pgpool-II 3.6 alpha1 is now released. This is not a stable version but just for developers.
 
 
V3.6 has a new feature:
 
* Improve the behavior of fail-over.
 
* New PGPOOL SET command has been introduced.
 
* Watchdog is significantly enhanced.
 
* Handling of extended query protocol (e.g. used by Java applications) in streaming replication mode speeds up if many rows are returned in a result set.
 
* Import parser of PostgreSQL 9.6.
 
* In some cases pg_terminate_backend() now does not trigger a fail-over.
 
* Change documentation format from raw HTML to SGML.
 
* etc.
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.5 RC1 released (2016/1/14) ===
 
 
pgpool-II 3.5 RC1 and pgpoolAdmin 3.5 RC1 are now relased. This is not a stable version but just for developers.
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.5 beta1 released (2015/12/14) ===
 
 
pgpool-II 3.5 beta1 and pgpoolAdmin 3.5 beta1 are now released. This is not a stable version but just for developers.
 
 
Users are encouraged to take part in our beta test program. Please help us in testing and making pgpool-II 3.5 better!
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.5 alpha1 released (2015/11/16) ===
 
 
Pgpool-II 3.5 alpha1 is now released. This is not a stable version but just for developers.
 
 
V3.5 has a new feature:
 
* Improved performance in extended query protocol
 
* Overcoming the thundering herd problem
 
* watchdog feature enhancements to be more robust and adaptable
 
* PCP command enhancements
 
* Import PostgreSQL 9.5 parser
 
* etc.
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
 
=== pgpool-II 3.3 RC1 released (2013/07/25) ===
 
 
Pgpool-II 3.3 RC1 is now released. This is not a stable version but just for developers.
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.3 beta1 released (2013/06/12) ===
 
 
Pgpool-II 3.3 beta1 is now relased. This is not a stable version but just for developers.
 
 
Users are encouraged to take part in our beta test program. Please help us in testing and making pgpool-II 3.3 better!
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.3 alpha1 released (2013/05/17) ===
 
 
Pgpool-II 3.3 alpha1 is now released. This is not a stable version but just for developers.
 
 
V3.3 has a new feature:
 
* Enhancements for watchdog
 
** New monitoring method of watchdog lifecheck using heartbeat signal
 
** Interlocking of failover/failback script
 
** Secure watchdog communication
 
** etc.
 
* Othres
 
** Import PostgreSQL 9.2 raw parser
 
** New pgpool_setup tool
 
** Support for using CREATE EXTENSION to install pgpool specific extensions
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
  
 
== Old ==
 
== Old ==
 
See [[Old news|this page]].
 
See [[Old news|this page]].
  
= Where can I get commercial support for pgpool-II? =
+
= Where can I get commercial support for Pgpool-II? =
  
Some commercial packages include pgpool-II support. Consulting and annual support can be purchased from SRA OSS, Inc. Japan (https://www.sraoss.co.jp/index_en.php).
+
Some commercial packages include Pgpool-II support. Consulting and annual support can be purchased from SRA OSS LLC (https://www.sraoss.co.jp/index_en.php).

Latest revision as of 00:12, 9 September 2024


Contents

Welcome to Pgpool Wiki!

What is Pgpool-II?

Pgpool-II is a middleware that works between PostgreSQL servers and a PostgreSQL database client. It is distributed under a license similar to BSD and MIT. It provides the following features.

  • Connection Pooling
Pgpool-II saves connections to the PostgreSQL servers, and reuse them whenever a new connection with the same properties (i.e. username, database, protocol version) comes in. It reduces connection overhead, and improves system's overall throughput.
  • Replication
Pgpool-II can manage multiple PostgreSQL servers. Using the replication function enables creating a realtime backup on 2 or more physical disks, so that the service can continue without stopping servers in case of a disk failure.
  • Load Balancing
If a database is replicated, executing a SELECT query on any server will return the same result. Pgpool-II takes an advantage of the replication feature to reduce the load on each PostgreSQL server by distributing SELECT queries among multiple servers, improving system's overall throughput. At best, performance improves proportionally to the number of PostgreSQL servers. Load balance works best in a situation where there are a lot of users executing many queries at the same time.
  • Limiting Exceeding Connections
There is a limit on the maximum number of concurrent connections with PostgreSQL, and connections are rejected after this many connections. Setting the maximum number of connections, however, increases resource consumption and affect system performance. pgpool-II also has a limit on the maximum number of connections, but extra connections will be queued instead of returning an error immediately.
  • Watchdog
Watchdog can coordinate multiple Pgpool-II, create a robust cluster system and avoid the single point of failure or split brain. Watchdog can perform lifecheck against other pgpool-II nodes, to detect a fault of Pgpoll-II. If active Pgpool-II goes down, standby Pgpool-II can be promoted to active, and take over Virtual IP.
  • In Memory Query Cache
In memory query cache allows to save a pair of SELECT statement and its result. If an identical SELECTs comes in, Pgpool-II returns the value from cache. Since no SQL parsing nor access to PostgreSQL are involved, using in memory cache is extremely fast. On the other hand, it might be slower than the normal path in some cases, because it adds some overhead of storing cache data.

Pgpool-II speaks PostgreSQL's backend and frontend protocol, and relays messages between a backend and a frontend. Therefore, a database application (frontend) thinks that Pgpool-II is the actual PostgreSQL server, and the server (backend) sees Pgpool-II as one of its clients. Because Pgpool-II is transparent to both the server and the client, an existing database application can be used with Pgpool-II almost without a change to its sources.

Pgpool-II License

See License.

Stable versions

  • Pgpool-II: 4.5, 4.4, 4.3, 4.2, 4.1

Contacts

  • If you have technical questions regarding Pgpool-II, please subscribe Pgpool-II mailing lists and send questions to it (pgpool-general will be a starter). Please do not send technical questions via private email. We will not respond such that messages.
  • If you believe that you found a vulnerability/security issues with Pgpool-II, please send a private email to ishii at postgresql.org (he is the project leader).

What's new

News

Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 officially released (2024/09/09)

Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 officially released.

This release contains a security fix.

When the query cache feature is enabled, it was possible that a database user can read rows from tables that should not be visible for the user through query cache (CVE-2024-45624).

All versions of Pgpool-II older than 4.5.4, 4.4.9, 4.3.12, 4.2.19, 4.1.22, and all older versions that has the query cache feature (the query cache feature was implemented in 3.2) are affected by the vulnerability. It is strongly recommend to upgrade to Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 or later. Or you should better turn off the query cache feature.

You can download them here.

Events

PGConf.ASIA 2019 in Bali

Bo Peng is going to give a presentation Setup a High-Availability and Load Balancing PostgreSQL Cluster: New Features of Pgpool-II 4.1 at "PGConf.ASIA 2019" held in Bali from September 8th to 11st.

PGConf.ASIA 2018 in Tokyo

Tatsuo Ishii and Bo Peng are going to give a presentation Celebrating its 15th Anniversary Pgpool-II Past Present and Future Celebrating its 15th Anniversary Pgpool-II Past Present and Future part2 at "PGConf.ASIA 2018" held in Tokyo from December 10th to 12th.

PGConf.ASIA 2017 in Tokyo

Tatsuo Ishii is going to give a presentation "More reliability and support for PostgreSQL 10: Introducing Pgpool-II 3.7" at "PGConf.ASIA 2017", held in Tokyo from December 4th to 6th.

PostgreSQL Conference in Russia 2016

Tatsuo gave a talk "How to manage a herd of elephants" at "PostgreSQL Conference in Russia 2016", held in Moscow from February 4th to 5th. The slides are available in Developer's documentation.

PostgreSQL Conference in China 2015

Tatsuo gave a talk "How to manage a herd of elephants" at "PostgreSQL Conference in China 2015", held in Beijing from November 21th to 22th. The slides are available in Developer's documentation.

pgCon 2015 Cluster Hacker Summit

We participated "6th Postgres Cluster Hacker Summit" which was held as a part of PgCon 2015 Developer Unconference. We reported about Development Status Updates and pgpool-II 3.5 features. The slides are available in Developer's documentation.

Pgpool-II Day 2015 in Tokyo

We had the very first time pgpool-II decicated conference. See the event report.

Stable

Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 officially released (2024/09/09)

Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 officially released.

This release contains a security fix.

When the query cache feature is enabled, it was possible that a database user can read rows from tables that should not be visible for the user through query cache (CVE-2024-45624).

All versions of Pgpool-II older than 4.5.4, 4.4.9, 4.3.12, 4.2.19, 4.1.22, and all older versions that has the query cache feature (the query cache feature was implemented in 3.2) are affected by the vulnerability. It is strongly recommend to upgrade to Pgpool-II 4.5.4, 4.4.9, 4.3.12, 4.2.19 and 4.1.22 or later. Or you should better turn off the query cache feature.

You can download them here.

Pgpool-II 4.5.3, 4.4.8, 4.3.11, 4.2.18 and 4.1.21 officially released (2024/08/15)

Pgpool-II 4.5.3, 4.4.8, 4.3.11, 4.2.18 and 4.1.21 officially released.

You can download them here.

Pgpool-II 4.5.2, 4.4.7, 4.3.10, 4.2.17 and 4.1.20 officially released (2024/05/16)

Pgpool-II 4.5.2, 4.4.7, 4.3.10, 4.2.17 and 4.1.20 officially released.

You can download them here.

Pgpool-II 4.5.1, 4.4.6, 4.3.9, 4.2.16 and 4.1.19 officially released (2024/02/29)

Pgpool-II 4.5.1, 4.4.6, 4.3.9, 4.2.16 and 4.1.19 officially released.

You can download them here.

Pgpool-II 4.5.0 released (2023/12/12)

Pgpool-II 4.5.0 is now released. This is the first stable release of Pgpool-II 4.5.x.

V4.5 contains new features and enhancements, including:

  • Allow to use more kind of multiple statements in a query string.
  • Allow to load balance PREPARE/EXECUTE/DEALLOCATE.
  • Allow to set delay_threshold_by_time in milliseconds.
  • Avoid session disconnection issue in failover/failback/backend error in some cases.
  • Allow to route queries to a specific backend node for a specific user connection.
  • Support multiple directories specification for pcp_socket_dir.
  • Import PostgreSQL 16's SQL parser.

You can download it from here.

Release notes: English

Pgpool-II 4.4.5, 4.3.8, 4.2.15, 4.1.18 and 4.0.25 officially released (2023/11/30)

Pgpool-II 4.4.5, 4.3.8, 4.2.15, 4.1.18 and 4.0.25 officially released.

Please note that 4.0.25 is the last release of the 4.0.x series.

You can download them here.

Pgpool-II 4.4.4, 4.3.7, 4.2.14, 4.1.17 and 4.0.24 officially released (2023/08/17)

Pgpool-II 4.4.4, 4.3.7, 4.2.14, 4.1.17 and 4.0.24 officially released.

You can download them here.

Pgpool-II 4.4.3, 4.3.6, 4.2.13, 4.1.16 and 4.0.23 officially released (2023/05/18)

Pgpool-II 4.4.3, 4.3.6, 4.2.13, 4.1.16 and 4.0.23 officially released.

You can download them here.

End-of-Life (EOL) Announcement for pgpoolAdmin (2023/02/17)

Pgpool Global Development Group announces end-of-life date for pgpoolAdmin, which is the management tool for Pgpool-II.

Pgpool Global Development Group will provide maintenance for pgpoolAdmin 4.0, 4.1 and 4.2 until December 31, 2023. After this date, bug fixes and security fixes for these versions will no longer be provided.

In addition, pgpoolAdmin for Pgpool-II 4.3 or later will not be released.

We would like to thank you for using pgpoolAdmin over the years.

Pgpool-II 4.4.2, 4.3.5, 4.2.12, 4.1.15 and 4.0.22 officially released (2023/01/23)

Pgpool-II 4.4.2, 4.3.5, 4.2.12, 4.1.15 and 4.0.22 officially released.

This release contains a security fix.

If following conditions are all met, the password of "wd_lifecheck_user" is exposed by "SHOW POOL STATUS" command. The command can be executed by any user who can connect to Pgpool-II. (CVE-2023-22332)

  • Version 3.3 or later
  • use_watchdog = on
  • wd_lifecheck_method = 'query'
  • A plain text password is set to wd_lifecheck_password

In this case it is strongly recommended to upgrade to this version (we do not expose wd_lifecheck_password in show pool_status command any more), or use one of following workarounds.

Workarounds for 4.0.x to 4.4.x users:

  • Disable watchdog. Set use_watchdog to off.
  • Change wd_lifecheck_method to heartbeat.
  • Set an empty string to wd_lifecheck_password. This will use password in the pool_passwd file.
  • Set an AES encrypted password to wd_lifecheck_password.

In any case we recommend to change "wd_lifecheck_password" in PostgreSQL.

Workarounds for 3.0.x to 3.7.x users:

  • Disable watchdog. Set use_watchdog to off.
  • Change wd_lifecheck_method to heartbeat.

In any case we recommend to change "wd_lifecheck_password" in PostgreSQL.

Please note that Pgpool-II 3.7.x or before are end of life and no minor updates are provided for those versions.

You can download them here.

Pgpool-II 4.4.1, 4.3.4, 4.2.11, 4.1.14, 4.0.21 and 3.7.26 officially released (2022/12/22)

Pgpool-II 4.4.1, 4.3.4, 4.2.11, 4.1.14, 4.0.21 and 3.7.26 officially released.

You can download them here.

Pgpool-II 4.4.0 released (2022/12/06)

Pgpool-II 4.4.0 is now released. This is the first stable release of Pgpool-II 4.4.x.

V4.4 contains new features and enhancements, including:

  • Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
  • Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
  • As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
  • Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
  • Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
  • Import PostgreSQL 15's SQL parser.
  • Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.

You can download it from here.

Release notes: English Japanese

Pgpool-II 4.3.3, 4.2.10, 4.1.13, 4.0.20 and 3.7.25 officially released (2022/08/18)

Pgpool-II 4.3.3, 4.2.10, 4.1.13, 4.0.20 and 3.7.25 officially released.

You can download them here.

Pgpool-II 4.3.2, 4.2.9, 4.1.12, 4.0.19 and 3.7.24 officially released (2022/05/19)

Pgpool-II 4.3.2, 4.2.9, 4.1.12, 4.0.19 and 3.7.24 officially released.

You can download them here.

Pgpool-II 4.3.1, 4.2.8, 4.1.11, 4.0.18 and 3.7.23 officially released (2022/02/17)

Pgpool-II 4.3.1, 4.2.8, 4.1.11, 4.0.18 and 3.7.23 officially released.

You can download them here.

Pgpool-II 4.2.7, 4.1.10, 4.0.17 and 3.7.22 officially released (2021/12/23)

Pgpool-II 4.2.7, 4.1.10, 4.0.17 and 3.7.22 officially released.

The purpose of this release is to provide packages for PostgreSQL 14.

You can download them here.

Pgpool-II 4.3.0 released (2021/12/07)

Pgpool-II 4.3.0 is now released. Please take a look at 4.3.0

V4.3.0 contains new features and enhancements, including:

  • A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
  • Allow to choose the least replication delay standby node when selecting the load balance node.
  • Allow to specify the node id to be promoted in pcp_promote_node.
  • Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.
  • Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
  • Allow pcp_node_info to list all backend nodes information.
  • Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  • Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.
  • Add support for log time stamp with milliseconds.
  • Import PostgreSQL 14's SQL parser.
  • Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
  • pgpool.conf sample files are unified into single sample file for easier configuration.
  • All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.

You can download it from here.

Release notes: English

Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released (2021/11/18)

Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released.

You can download them here.

Pgpool-II 4.2.5 released (2021/09/14)

Pgpool Global Development Group is pleased to announce the availability of Pgpool-II 4.2.5.

You can download them here.

Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released (2021/08/05)

Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released.

You can download them here.

pgpoolAdmin 4.2.0 officially released (2021/06/17)

pgpoolAdmin 4.2.0 officially released.

pgpoolAdmin 4.2.0 adds support for Pgpool-II 4.2. Please take a look at release notes.

You can download them here.

Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released (2021/05/20)

Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released.

You can download them here.

Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released (2021/02/18)

Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released.

You can download them here.

Pgpool-II 4.2.1 released (2020/12/23)

Pgpool-II 4.2.1 is now released.

You can download them from here.

Pgpool-II 4.2.0 released (2020/11/26)

Pgpool-II 4.2.0 is now released.

V4.2 contains new features and enhancements, including:

  • Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.
  • Implement logging_collector for easier log management.
  • Implement log_disconnections to collect disconnection logs.
  • Implement pg_enc and pg_md5 to allow to register multiple passwords at once.
  • Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.
  • New PCP command pcp_reload_config is added.
  • Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.
  • Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.
  • Support LDAP authentication between clients and Pgpool-II.
  • Add ssl_crl_file and ssl_passphrase_command to SSL configuration.
  • Import PostgreSQL 13's SQL parser.

You can download it from here.

Release notes: English

Pgpool-II 4.1.5, 4.0.12, 3.7.17, 3.6.24 and 3.5.28 officially released (2020/11/19)

Pgpool-II 4.1.5, 4.0.12, 3.7.17, 3.6.24 and 3.5.28 officially released

You can download them here.

Pgpool-II 4.1.4, 4.0.11, 3.7.16, 3.6.23 and 3.5.27 officially released (2020/09/17)

Pgpool-II 4.1.4, 4.0.11, 3.7.16, 3.6.23 and 3.5.27 officially released

You can download them here.

Pgpool-II 4.1.3, 4.0.10, 3.7.15, 3.6.22 and 3.5.26 officially released (2020/08/20)

Pgpool-II 4.1.3, 4.0.10, 3.7.15, 3.6.22 and 3.5.26 officially released

You can download them here.

Pgpool-II 4.1.2, 4.0.9, 3.7.14, 3.6.21 and 3.5.25 officially released (2020/05/21)

Pgpool-II 4.1.2, 4.0.9, 3.7.14, 3.6.21 and 3.5.25 officially released

You can download them here.

Pgpool-II 4.1.1, 4.0.8, 3.7.13, 3.6.20, 3.5.24 and pgpoolAdmin 4.1.0 officially released (2020/02/20)

Pgpool-II 4.1.1, 4.0.8, 3.7.13, 3.6.20, 3.5.24 and pgpoolAdmin 4.1.0 officially released

You can download them here.

Pgpool-II 4.1.0, 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 RPMs Update 2 officially released (2019/11/19)

Pgpool-II 4.1.0, 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 RPMs Update 2 are officially released. The updated RPM packages fixed the bug which logs are not output, when log_destination = 'syslog' is configured.

You can download them here.

Pgpool-II 4.1.0 released (2019/10/31)

Pgpool-II 4.1.0 is now relased.

Major enhancements in Pgpool-II 4.1 include:

  • Statement level load balancing.
  • Auto failback.
  • Enhance performance in number of areas.
    • Shared relation cache allows to reuse relation cache among sessions to reduce internal queries against PostgreSQL system catalogs.
    • Have separate SQL parser for DML statements to eliminate unnecessary parsing effort.
    • Load balancing control for specific queries.
  • Reduce Internal Queries against System Catalogs.
  • Import PostgreSQL 12 SQL parser.
  • etc.

You can download it from here.

Release notes: English Japanese

Development

Pgpool-II 4.5 RC1 released (2023/11/28)

Pgpool-II 4.5 RC1 is now released.

Note that this is not a stable version but just for developers.

V4.5 contains new features and enhancements, including:

  • Allow to use multiple statements in a query string.
  • Allow to set delay_threshold_by_time in milliseconds.
  • Avoid session disconnection issue in failover/failback/backend error in some cases.
  • Allow to route queries to a specific backend node for a specific user connection.
  • Support multiple directories specification for pcp_socket_dir.
  • Import PostgreSQL 16's SQL parser.

You can download it from here.

Release notes: English

Pgpool-II 4.5 beta1 released (2023/11/14)

Pgpool-II 4.5 beta1 is now released.

Note that this is not a stable version but just for developers.

V4.5 contains new features and enhancements, including:

  • Allow to use multiple statements in a query string.
  • Allow to set delay_threshold_by_time in milliseconds.
  • Avoid session disconnection issue in failover/failback/backend error in some cases.
  • Allow to route queries to a specific backend node for a specific user connection.
  • Support multiple directories specification for pcp_socket_dir.
  • Import PostgreSQL 16's SQL parser.

You can download it from here.

Release notes: English

Pgpool-II 4.4 RC1 released (2022/11/22)

Pgpool-II 4.4 RC1 is now released.

Note that this is not a stable version but just for developers.

V4.4 contains new features and enhancements, including:

  • Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
  • Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
  • As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
  • Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
  • Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
  • Import PostgreSQL 15's SQL parser.
  • Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.

You can download it from here.

Release notes: English

Pgpool-II 4.4 beta1 released (2022/11/14)

Pgpool-II 4.4 beta1 is now released.

Note that this is not a stable version but just for developers.

V4.4 contains new features and enhancements, including:

  • Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
  • Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
  • As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
  • Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
  • Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
  • Import PostgreSQL 15's SQL parser.
  • Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.

You can download it from here.

Release notes: English

Pgpool-II 4.3 RC1 released (2021/11/25)

Pgpool-II 4.3 RC1 is now released. Please take a look at 4.3 RC1

Note that this is not a stable version but just for developers.

V4.3 contains new features and enhancements, including:

  • A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
  • Allow to choose the least replication delay standby node when selecting the load balance node.
  • Allow to specify the node id to be promoted in pcp_promote_node.
  • Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.
  • Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
  • Allow pcp_node_info to list all backend nodes information.
  • Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  • Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.
  • Add support for log time stamp with milliseconds.
  • Import PostgreSQL 14's SQL parser.
  • Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
  • pgpool.conf sample files are unified into single sample file for easier configuration.
  • All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.

You can download it from here.

Release notes: English


Pgpool-II 4.3 beta2 released (2021/11/18)

Pgpool-II 4.3 beta2 is now released. Please take a look at 4.3 beta2

Note that this is not a stable version but just for developers.

V4.3 contains new features and enhancements, including:

  • A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
  • Allow to choose the least replication delay standby node when selecting the load balance node.
  • Allow to specify the node id to be promoted in pcp_promote_node.
  • Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.
  • Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
  • Allow pcp_node_info to list all backend nodes information.
  • Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  • Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.
  • Add support for log time stamp with milliseconds.
  • Import PostgreSQL 14's SQL parser.
  • Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
  • pgpool.conf sample files are unified into single sample file for easier configuration.
  • All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.

You can download it from here.

Release notes: English

Pgpool-II 4.3 beta1 released (2021/11/09)

Pgpool-II 4.3 beta1 is now released.

Note that this is not a stable version but just for developers.

V4.3 contains new features and enhancements, including:

  • A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
  • Allow to choose the least replication delay standby node when selecting the load balance node.
  • Allow to specify the node id to be promoted in pcp_promote_node.
  • Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.
  • Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
  • Allow pcp_node_info to list all backend nodes information.
  • Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  • Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.
  • Add support for log time stamp with milliseconds.
  • Import PostgreSQL 14's SQL parser.
  • Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
  • pgpool.conf sample files are unified into single sample file for easier configuration.
  • All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.

You can download it from here.

Release notes: English

Pgpool-II 4.2 beta1 released (2020/10/27)

Pgpool-II 4.2 beta1 is now released.

Note that this is not a stable version but just for developers.

V4.2 contains new features and enhancements, including:

  • Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.
  • Implement logging_collector for easier log management.
  • Implement log_disconnections to collect disconnection logs.
  • Implement pg_enc and pg_md5 to allow to register multiple passwords at once.
  • Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.
  • New PCP command pcp_reload_config is added.
  • Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.
  • Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.
  • Support LDAP authentication between clients and Pgpool-II.
  • Add ssl_crl_file and ssl_passphrase_command to SSL configuration.
  • Import PostgreSQL 13's SQL parser.

You can download it from here.

Release notes: English

Pgpool-II 4.2 alpha1 released (2020/10/06)

Pgpool-II 4.2 alpha1 is now released.

Note that this is not a stable version but just for developers.

V4.2 contains new features and enhancements, including:

  • Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.
  • Implement logging_collector for easier log management.
  • Implement log_disconnections to collect disconnection logs.
  • Implement pg_enc and pg_md5 to allow to register multiple passwords at once.
  • Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.
  • New PCP command pcp_reload_config is added.
  • Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.
  • Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.
  • Support LDAP authentication between clients and Pgpool-II.
  • Add ssl_crl_file and ssl_passphrase_command to SSL configuration.
  • Import PostgreSQL 13's SQL parser.

You can download it from here.

Release notes: English

Pgpool-II 4.1 RC1 released (2019/10/16)

Pgpool-II 4.1 RC1 is now released.

This is not intended to be used in production but is close to the release version. So users are encouraged to test it out.

Major enhancements in Pgpool-II 4.1 include:

  • Statement level load balancing.
  • Auto failback.
  • Enhance performance in number of areas.
    • Shared relation cache allows to reuse relation cache among sessions to reduce internal queries against PostgreSQL system catalogs.
    • Have separate SQL parser for DML statements to eliminate unnecessary parsing effort.
    • Load balancing control for specific queries.
  • Reduce Internal Queries against System Catalogs.
  • Import PostgreSQL 12 SQL parser.
  • etc.

You can download it from here.

Release notes: English

Pgpool-II 4.1 beta1 released (2019/09/06)

Pgpool-II 4.1 beta1 is now released.

This is not a stable version but just for developers.

Major enhancements in Pgpool-II 4.1 include:

  • Statement level load balancing.
  • Auto failback.
  • Enhance performance in number of areas.
    • Shared relation cache allows to reuse relation cache among sessions to reduce internal queries against PostgreSQL system catalogs.
    • Have separate SQL parser for DML statements to eliminate unnecessary parsing effort.
    • Load balancing control for specific queries.
  • Reduce Internal Queries against System Catalogs.
  • Import PostgreSQL 12 SQL parser.
  • etc.

You can download it from here.

Release notes: English

Old

See this page.

Where can I get commercial support for Pgpool-II?

Some commercial packages include Pgpool-II support. Consulting and annual support can be purchased from SRA OSS LLC (https://www.sraoss.co.jp/index_en.php).