Re: WAL archive on slave - Mailing list pgsql-general
I can understand it will create duplicates, but it would also allow for recovery from backups.
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James Sewell,
PostgreSQL Team Lead / Solutions Architect
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If a backup was taken at midnight, and promotion happened at 6am then having archiving on the slave would allow log replay from the backup.
Log replay from the old master would potentially end up in the incorrect timeline.
Although potentially merging the archive logs favoring the new master's logs might fix this?
Either way, it seems the answer to my question is no.
Thanks for the help!
-James Sewell
On Monday, 10 February 2014, Albe Laurenz <laurenz.albe@wien.gv.at> wrote:
James Sewell wrote:
> If it is the the only way that I could achieve what I wanted would be to set
> wal_keep_segments high enough then they will all be archived on promotion?
Even if you set wal_keep_segments high I don't think that the replayed
WAL will be archived.
> I'm still not sure why they wouldn't be archived on the slave, seen as they show up in the directory?
> Is there a limitation I'm not thinking about here?
I guess that the idea is that a cluster will only archive the WAL it
generates. Typically, the primary would archive these (if you don't archive
WAL on the primary, you're probably doing something wrong).
So this would only lead to duplicates.
Yours,
Laurenz Albe
--
James Sewell,
PostgreSQL Team Lead / Solutions Architect
______________________________________
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