Re: Disable Streaming Replication without restarting either master or slave

On Wed, May 30, 2012 at 2:38 AM, Michael Nolan <htfoot(at)gmail(dot)com> wrote:
>
>
> ---------- Forwarded message ----------
> From: Michael Nolan <htfoot(at)gmail(dot)com>
> Date: Tue, May 29, 2012 at 1:37 PM
> Subject: Re: [GENERAL] Disable Streaming Replication without restarting
> either master or slave
> To: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
>
>
>
>
> On Tue, May 29, 2012 at 1:15 PM, Fujii Masao <masao(dot)fujii(at)gmail(dot)com> wrote:
>>
>> On Tue, May 29, 2012 at 10:17 PM, François Beausoleil
>> <francois(at)teksol(dot)info> wrote:
>
>
>>
>> > Are per-chance looking for pg_xlog_replay_pause() and
>> > pg_xlog_replay_resume() ?
>>
>> Those can pause and resume WAL replay in the standby, but not streaming
>> replication. Even while WAL replay is being paused, WAL can be streamed
>> from the master to the standby.
>>
>> Regards,
>>
>> --
>> Fujii Masao
>
>
> So, that means that the only ways to stop streaming replication are to stop
> the slave server, to disable access to the master via the pg_hba.conf file
> (requiring the master configs be reloaded) or to set the trigger file on the
> slave to tell it to stop replicating the master.
>
> And if the master/slave are set to synchronous streaming replication, your
> options are more limited, since the master has to know to stop waiting for
> the synchronous slave to respond.
>
> Once the slave has gone out of asynchronous replication mode, wuld it be
> possible to resume asynchronous replication by stopping the slave server,
> removing the trigger file, and restarting it in asynchronous streaming
> replication mode?  This would, at a minimum, depend on how many updates have
> occurred on the master during the time streaming replication was disabled
> and having all the WAL files available, right?

You'd like to restart the *promoted* standby server as the standby again?
To do this, a fresh base backup must be taken from the master onto
the standby before restarting it, even if there has been no update since
the standby had been promoted.

Regards,

--
Fujii Masao