A.51. Release 4.2.1

Change the socket path to "/var/run/postgresql" in all of the pgpool.conf samples. (Bo Peng)

Use single shared memory segment for all shared variables in Pgpool parent process (Muhammad Usama)

Shared memory segments is a limited resource and opening too many segments should be avoided.

Delete any pre-existing watchdog command socket file at startup (Muhammad Usama)

Patch provided by Masaya Kawamoto

Doc: Add missing raw mode to "5.3. Clustering mode" and fix typos. (Bo Peng)

Fix incorrect heartbeat related results of pcp_pool_status and SHOW POOL_STATUS commands. (Bo Peng)

Doc: fix usage of firewall-cmd in the installation tips section. (Tatsuo Ishii)

firewall-cmd opened unnecessary ports in the example.

Fix segfault that may occur when backend_flag = 'ALWAYS_PRIMARY|ALLOW_TO_FAILOVER' or failover_command = ''. (bug 672) (Tatsuo Ishii)

Fix for inconsistent watchdog node_id problem in wd_cli and watchdog lifecheck mechanism. (Muhammad Usama)

When pgpool node 0 (leader watchdog) is shutdown, all of the pgpool nodes terminate abnormally. This commit fixed this issue.

Fix error if watchdog is disabled and wd_port is not defined. (Tatsuo Ishii)

Fix compiler error on FreeBSD. (bug 670) (Tatsuo Ishii)

Patch is provided by ajs.

Fix file swapping race condition in pool_passwd. (Tatsuo Ishii)

Patch is provided by Masaya Kawamoto.