Re: [BUG] Streaming replica sees the old max_connections value

On Fri, Mar 7, 2014 at 12:22 PM, Andres Freund <andres@2ndquadrant.com> wrote:
>> LOG:  database system is shut down
>> LOG:  database system was shut down in recovery at 2014-03-07 19:00:49 GMT
>> LOG:  entering standby mode
>> FATAL:  hot standby is not possible because max_connections = 100 is a
>> lower setting than on the master server (its value was 500)
>> LOG:  startup process (PID 12187) exited with exit code 1
>
> That's easy to explain. The check is done based on the control file and
> that's already on the standby in your case. You need to first replay a
> bit of WAL from the primary after lowering the value, triggering the
> standby to update what it knows about the master's settings. When
> lowering values, it's simplest to first restart the primary with the new
> values, wait for the standbys to catch up, and then restart them.

Thank you. It helped. Looks like 20 seconds of the delay between
restarts was not enough the first time.

--
Kind regards,
Sergey Konoplev
PostgreSQL Consultant and DBA

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