postgres-xc-developers Mailing List for Postgres-XC

Hi,

So what's the latest status of these HA activities for PGXC?

Like the coordinator/datanode agents being discussed here, do we have
agents for GTM for example? Also is this happening in some open source
group where we can participate and see the latest and greatest source
changes?

Regards,
Nikhils

On Mon, Jul 23, 2012 at 12:06 AM, Koichi Suzuki
<ko...@in...> wrote:
> Thanks.   I found the latter works for the master.
> ---
> Koichi
>
> On Mon, 23 Jul 2012 12:53:50 +0900
> Michael Paquier <mic...@gm...> wrote:
>
>> > 2. select application_name,upper(state),upper(sync_state) from
>> > pg_stat_replication;
>> >
>> > This does not work.  pg_stat_replication has zero row.
>> >
>> Because this is datanode slave, we don't have GTM connection or
>> > snapshot.  This might be a cause of the problem 2, or we might have
>> > blocked to update pg_stat_replication system catalog.
>> >
>> pg_stat_replication has by definition one row per wal sender process:
>> http://www.postgresql.org/docs/9.1/static/monitoring-stats.html#MONITORING-STATS-VIEWS-TABLE
>> AFAIK, slave has no wal sender processes running, so it is normal to see
>> nothing on the slave side, all the data is on the master side. The data is
>> only available on master, Am I missing smth?
>> You might be able to see rows in pg_stat_replication on a slave if you use
>> cascading replication however, but this feature is only available in 9.2.
>> Also, in the case of XC, you can use EXECUTE DIRECT to get the information
>> of pg_stat_replication from remote nodes, Coordinators and Datanodes
>> included.
>> --
>> Michael Paquier
>> http://michael.otacoo.com
>
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