WAL archive on slave
Hello,
My understanding is that WAL archiving can not be enabled on the slave in a streaming replication pair.
If this is correct, is there a reason behind it? I can see logs showing up in pg_xlog, so could they not be archived?
The reason I ask is if this happened it would allow the following with a streaming replication pair (A,B):
- Start A as master
- Attach B as slave using basebackup
- work ....
- Promote B to master
- Restore A from a scheduled backup to a time before promotion
- Attach A as slave pointing at B's WAL archive
If we used A's WAL archive in this case and A had writes after the promotion then we would get timeline errors.
As far as I can tell, using the WAL archive from B would resolve this issue.
Or have I missed something here?
Cheers,
Cheers,
James Sewell,
PostgreSQL Team Lead / Solutions Architect
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PostgreSQL Team Lead / Solutions Architect
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