[pgpool-committers: 8562] pgpool: Fix for [pgpool-general: 7896] Possible race condition..

[Muhammad Usama]

Fix for [pgpool-general: 7896] Possible race condition..

Watchdog does not allow the remote nodes reported lost by life-check to rejoin
the cluster until the life-check process confirms the existence of life in the
previously lost nodes. This is good enough except for the case when the
(lost by life-check) node tries to rejoin the cluster after it was restarted
(Pgpool-II service restarted).
What happens is the cluster keeps rejecting the restarted node because
the cluster's life-check doesn't agree while the restarted node's life-check
waits to be added to cluster before it can start sending the heart-beats.

The fix is to allow the previously lost remote node become the part of the
cluster after restart, no matter the lost-reason.

Issue report:
https://www.pgpool.net/pipermail/pgpool-general/2021-November/007954.html

Branch
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V3_7_STABLE

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=b66b73a2f46956ab6781acdf42a9f53b704a3f46

Modified Files
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src/watchdog/watchdog.c | 21 ++++++---------------
1 file changed, 6 insertions(+), 15 deletions(-)