A.21. Release 4.0.6

Doc: Update "Pgpool-II + Watchdog Setup Example" to support PostgreSQL 12. (Bo Peng)

Import some of memory manager debug facilities from PostgreSQL. (Tatsuo Ishii)

Use pg_get_expr() instead of pg_attrdef.adsrc to support for PostgreSQL 12. (Bo Peng)

Enhance shutdown script of pgpool_setup. (Tatsuo Ishii)

• Make shutdownall to wait for completion of shutdown of Pgpool-II.

• If environment variable CHECK_TIME_WAIT is set to true, use netstat command to confirm usage of the TCP/IP port while executing shutdown script.

Deal pgpool_adm extension with PostgreSQL 12. (Tatsuo Ishii)

Doc: add description to pg_md5 man page how to show pool_passwd hashed string. (Tatsuo Ishii)

Doc: add general description about failover. (Tatsuo Ishii)

Test: Fix test failure of extended-query-test when disable_load_balance_on_write = off/transaction/always. (Tatsuo Ishii)

Fix "unable to bind. cannot get parse message" error. (bug 531) (Tatsuo Ishii)

Fix online-recovery is blocked after a child process exits abnormally with replication mode and watchdog. (bug 483) (Muhammad Usama)

Fix for keep the backend health check running on quarantined nodes. (Muhammad Usama)

Pgpool should keep the backend health check running on quarantined nodes so that when the connectivity resumes, they should automatically get removed from the quarantine.

See [pgpool-hackers: 3295] for more details.

Fix for no primary on standby pgpool when primary is quarantined on master. (Muhammad Usama)

Master watchdog Pgpool sends the backend status sync message if the primary node is quarantined on it. So standby watchdog pgpool must not update its status when the status of current primary node is not DOWN.

Fix watchdog_setup command mode option to work correctly. (Takuma Hoshiai)

Fix pgpool_setup to produce correct follow master command. (Tatsuo Ishii)

Fix in native replication mode Pgpool-II rewriting query error when the queries include GROUPS and EXCLUDE in frame clauses. (Bo Peng)

Fix query cache module so that it checks oid array's bound. (Tatsuo Ishii)

Fix off-by-one error in query cache module. (Tatsuo Ishii)

Allow health check process to reload. (Tatsuo Ishii)

Fix segfault when query cache is enabled. (bug 525) (Tatsuo Ishii)

Down grade LOG "checking zapping sent message ..." to DEBUG5. (Tatsuo Ishii)

Discussion: [pgpool-general: 6620]

Fix segfault when samenet is specified in pool_hba.conf. (Tatsuo Ishii)

Discussion: [pgpool-general: 6601].

Doc: Fix documentation mistakes in follow_master.sh script and typos. (Bo Peng)

Fix health check process is not shutting down in certain cases. (Tatsuo Ishii)

Fix to deal with backslashes according to the config of standard_conforming_strings in native replication mode. (bug 467) (Bo Peng)

Fix compile error on FreeBSD. (bug 512, bug 519) (Bo Peng)

Fix memory leaks. (Tatsuo Ishii)

Make failover in progress check more aggressively to avoid potential segfault. (Tatsuo Ishii)