Re: Operating of synchronous master when no standby is available

I already have rep_mode set to "sync", but the primary node switches to
async mode only if the replica is shutted down correctly. When I shut down
the replica by powering it off to emulate power unit failure, primary
remains in sync mode until "pcs resource cleanup" is performed. I think it
is possible to run resource cleanup in script on cluster alert.

вт, 3 окт. 2023 г. в 05:13, MATSUO Takatoshi <matsuo(dot)tak(at)gmail(dot)com>:

> Pgsql RA has rep_mode=sync parameter.
> https://wiki.clusterlabs.org/wiki/PgSQL_Replicated_Cluster
>
> 2023年10月2日(月) 23:48 Sergey Cherukhin <sergey(dot)cherukhin(at)gmail(dot)com>:
>
>> Hello!
>>
>> I use Postgresql+Pacemaker+Corosync cluster with 2 Postgresql instances
>> in synchronous replication mode. When one of the nodes is down, clients
>> hang on INSERT operations because the primary server waits until standby
>> confirms that it got the data, but the standby node is down.
>>
>> I need clients to feel no difference when they operate with a fully
>> operational cluster or with a degraded cluster containing primary
>> node alone.
>>
>> Is it possible to configure synchronous replication to operate normally
>> when primary and replica are online, but primary no waits confirmation from
>> replica if replica is not connected?
>>
>> Best regards,
>> Sergey Cherukhin
>>
>>