> > What happen if in heath check, a backend is ok, soon
> after health check, backend will unpluged ( so there is an
> error backend ).
> > is there any query will failed ?
>
> No problem.
>
> Health checking is done by a separate process, i.e. pgpool
> parent. So
> even if pgpool children are blocked by read/write, next
> round health
> checking will detect the failure and do fail over.
What happen first query after last health check before next health check ( of
course before next failover ) ?. will success or fail ?.
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