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* Cleanup of same archive used by multiple standbys
@ 2011-08-10 16:41 A J <s5aly@yahoo.com>
0 siblings, 2 replies; 4+ messages in thread
From: A J @ 2011-08-10 16:41 UTC (permalink / raw)
To: pgsql-admin
What is the suggested technique for cleaning up an archive location shared by multiple standbys. Looks like pg_archivecleanup cannot be used as %r refers to last restartpoint of only a single standby server.
Do I need to create a custom script that somehow determines the latest common restartpoint of ALL the standbys and then manually run pg_archivecleanup with that value ?
Thanks.
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Cleanup of same archive used by multiple standbys
@ 2011-08-10 16:53 A J <s5aly@yahoo.com>
parent: A J <s5aly@yahoo.com>
1 sibling, 1 reply; 4+ messages in thread
From: A J @ 2011-08-10 16:53 UTC (permalink / raw)
To: pgsql-admin
Also couple of additional related question:
2. Am I correct in my assumption that if for some reason archive is not cleaned up and runs out of space, the WALs will accumulate in pg_xlog directory on the primary. If pg_xlog was to then run out of space, Primary server will stop accepting new writes and fail ?
3. If my standbys are in different datacenter, what is the suggested location of the archive directory ? Is it recommended to have it local in the data center of the primary server or somehow have it over in the remote data center.
Thanks for any pointers.
________________________________
From: A J <s5aly@yahoo.com>
To: PG Admin <pgsql-admin@postgresql.org>
Sent: Wednesday, August 10, 2011 12:41 PM
Subject: Cleanup of same archive used by multiple standbys
What is the suggested technique for cleaning up an archive location shared by multiple standbys. Looks like pg_archivecleanup cannot be used as %r refers to last restartpoint of only a single standby server.
Do I need to create a custom script that somehow determines the latest common restartpoint of ALL the standbys and then manually run pg_archivecleanup with that value ?
Thanks.
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Cleanup of same archive used by multiple standbys
@ 2011-08-10 16:53 Kevin Grittner <Kevin.Grittner@wicourts.gov>
parent: A J <s5aly@yahoo.com>
1 sibling, 0 replies; 4+ messages in thread
From: Kevin Grittner @ 2011-08-10 16:53 UTC (permalink / raw)
To: pgsql-admin; A J <s5aly@yahoo.com>
A J <s5aly@yahoo.com> wrote:
> What is the suggested technique for cleaning up an archive
> location shared by multiple standbys. Looks like pg_archivecleanup
> cannot be used as %r refers to last restartpoint of only a single
> standby server. Do I need to create a custom script that somehow
> determines the latest common restartpoint of ALL the standbys and
> then manually run pg_archivecleanup with that value ?
I seem to remember that in a previous discussion of this the best
idea seemed to be to create a hard link to the file for each
standby, such that when the last standby cleans up the file, it is
actually deleted.
-Kevin
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: Cleanup of same archive used by multiple standbys
@ 2011-08-10 17:00 Kevin Grittner <Kevin.Grittner@wicourts.gov>
parent: A J <s5aly@yahoo.com>
0 siblings, 0 replies; 4+ messages in thread
From: Kevin Grittner @ 2011-08-10 17:00 UTC (permalink / raw)
To: pgsql-admin; A J <s5aly@yahoo.com>
A J <s5aly@yahoo.com> wrote:
> Also couple of additional related question:
> 2. Am I correct in my assumption that if for some reason archive
> is not cleaned up and runs out of space, the WALs will accumulate
> in pg_xlog directory on the primary. If pg_xlog was to then run
> out of space, Primary server will stop accepting new writes and
> fail ?
That sounds correct to me. I've never seen it in practice, though;
we would need to ignore alerts from our monitoring for quite some
time before it got to that point.
> 3. If my standbys are in different datacenter, what is the
> suggested location of the archive directory ? Is it recommended to
> have it local in the data center of the primary server or somehow
> have it over in the remote data center.
In our shop we have found it advantageous to immediately write it
locally, and then use rsync (through ssh and a daemon) to bring the
remote site(s) into sync.
-Kevin
^ permalink raw reply [nested|flat] 4+ messages in thread
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2011-08-10 16:41 Cleanup of same archive used by multiple standbys A J <s5aly@yahoo.com>
2011-08-10 16:53 ` A J <s5aly@yahoo.com>
2011-08-10 17:00 ` Kevin Grittner <Kevin.Grittner@wicourts.gov>
2011-08-10 16:53 ` Kevin Grittner <Kevin.Grittner@wicourts.gov>
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