Re: Disable Streaming Replication without restarting either master or slave
| От | Samba |
|---|---|
| Тема | Re: Disable Streaming Replication without restarting either master or slave |
| Дата | |
| Msg-id | CAKgWO9JXan4iAHHCq5iN9aBENxBRaWmf=y673NUghiOAHfxBMg@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Disable Streaming Replication without restarting either master or slave (Fujii Masao <masao.fujii@gmail.com>) |
| Список | pgsql-general |
I understand the way things work currently, but would it not be more convenient to let the replication be stopped and started from SQL commands like:
On Master:
On Slave:
If Cascaded Streaming Replication is confugured, then
On Slave:
Or an OS executable [ either in the core or a contrib module] like
[ the last one would awesome; and i do not think that it is impossible, and would be loved by one and all ]
Regards,
Samba
========================================================
On Master:
select pg_pause_streaming_replication(slave_fqdn);
select pg_resume_streaming_replication(slave_fqdn);
On Slave:
select pg_pause_streaming_replication();
select pg_pause_streaming_replication();
If Cascaded Streaming Replication is confugured, then
On Slave:
select pg_start_streaming_replication(cascaded_slave_fqdn);
select pg_stop_streaming_replication(cascaded_slave_fqdn);
Or an OS executable [ either in the core or a contrib module] like
pg_replication -p primary_fqdn -s slave_fqdn -a pause
pg_replication -p primary_fqdn -s slave_fqdn -a resume
pg_replication -p primary_fqdn -s slave_fqdn -a setup
[ the last one would awesome; and i do not think that it is impossible, and would be loved by one and all ]
Regards,
Samba
========================================================
On Wed, May 30, 2012 at 12:07 AM, Fujii Masao <masao.fujii@gmail.com> wrote:
You'd like to restart the *promoted* standby server as the standby again?On Wed, May 30, 2012 at 2:38 AM, Michael Nolan <htfoot@gmail.com> wrote:
>
>
> ---------- Forwarded message ----------
> From: Michael Nolan <htfoot@gmail.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.fujii@gmail.com>
>
>
>
>
> On Tue, May 29, 2012 at 1:15 PM, Fujii Masao <masao.fujii@gmail.com> wrote:
>>
>> On Tue, May 29, 2012 at 10:17 PM, François Beausoleil
>> <francois@teksol.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?
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
--
Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general
В списке pgsql-general по дате отправления: