| pgpool-II 4.2.1 Documentation | |||
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Release Date: 2017-03-17
Add "Wants=network.target" to pgpool.service file. (bug 294) (Bo Peng)
Fix pcp_promote_node bug that fails promoting node 0. (Yugo Nagata)
The master node could not be promoted by pcp_promote_node with the following error;
FATAL: invalid pgpool mode for process recovery request
DETAIL: specified node is already primary node, can't promote node id 0
In streaming replication mode, there is a case that Pgpool-II regards the status of primary node as "standby" for some reasons, for example, when pg_ctl promote is executed manually during Pgpool-II is running, in which case, it seems to Pgpool-II that the primary node doesn't exist.
This status mismatch should be fixed by pcp_promote_node, but when the node is the master node (the first alive node), it fails as mentioned above.
The reason is as following. before changing the status, pcp_promote_node checks if the specified node is already primary or not by comparing the node id with PRIMARY_NODE_ID. However, if the primary doesn't exist from Pgpool-II's view, PRIMARY_NODE_ID is set to 0, which is same as MASTER_NODE_ID. Hence, when the master node is specified to be promoted, pcp_promote_node is confused that this node is already primary and doesn't have to be promoted, and it exits with the error.
To fix this, pcp_promote_node should check the node id by using REAL_PRIMARY_NODE_ID, which is set -1 when the primary doesn't exist, rather than PRIMARY_NODE_ID.
Add the latest release note link to README file.(Bo Peng)
Fix to release shared memory segments when Pgpool-IIexits. (bug 272) (Tatsuo Ishii)
Fix for [pgpool-general: 5315] pg_terminate_backend (Muhammad Usama)
Adding the missing ExecStop and ExecReload commands to the systemd service configuration file. (Muhammad Usama)
Fixing stack smashing detected. (bug 280) (Muhammad Usama)
It was a buffer overflow in wd_get_cmd function
Remove pool_log/pool_error calls from signal handlers. (Tatsuo Ishii)
See [pgpool-hackers: 1950] for details.
Fix for 0000249: watchdog sometimes fails de-escalation. (bug 249) (Muhammad Usama)
The solution is to use the waitpid() system call without WNOHANG option.
Fix connection_life_time broken by authentication_timeout. (Yugo Nagata)
Fix authentication timeout that can occur right after client connections. (Yugo Nagata)