On 07/21/2015 01:37 PM, William Dunn wrote:
But it appears that the fail condition for "watchdog" is the failure of
a pgpool-II instance. In the configuration described in the wiki you
would put a pgpool-II instance on each Postgres node, and if one of the
pgpool-II instances fails it executes a script (which can create the
trigger file to promote the standby to master). However, if the fail
condition for watchdog is a failure of the pgpool-II instance what
happens if the DBMS has availability issues but the pgpool-II process on
that server is ok? The fail condition would never be triggered, right?
What I am going off of is:
"When backend node status changes by failover etc., watchdog notifies
the information to other pgpool-IIs and synchronizes them. When online
recovery occurs, watchdog restricts client connections to other
pgpool-IIs for avoiding inconsistency between backends."
A backend node status would change if say the master went down, at that
point pgpool can be instructed either automatically or manually to
failover (depending on configuration) and allow the slave to failover.
Sincerely,
JD
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