Re: PostgreSQL Failback without rebuild
I've just noticed that on PostgreSQL 9.3 I can do the following with a master node A and a slave node B (as long as I have set recovery_target_timeline = 'latest'):
- Stop Node A
- Promote Node B
- Attach Node A as slave
This is sufficient for my needs (I know it doesn't cover a crash), can anyone see any potential problems with this approach?
Cheers,
James Sewell,
PostgreSQL Team Lead / Solutions Architect
______________________________________
On Wed, Feb 5, 2014 at 6:03 PM, Michael Paquier <michael.paquier@gmail.com> wrote:
On Wed, Feb 5, 2014 at 3:14 PM, Amit Kapila <amit.kapila16@gmail.com> wrote:
> On Wed, Feb 5, 2014 at 10:30 AM, James Sewell <james.sewell@lisasoft.com>>> I've seen some proposals and a tool (pg_rewind), but all seem to have drawFor 9.3, pg_rewind is only safe with page checksums enabled. For 9.4,
>> backs.
>
> As far as I remember, one of the main drawbacks for pg_rewind was related to
> hint bits which can be avoided by wal_log_hints. pg_rewind is not part of
> core
> PostgreSQL code, however if you wish, you can try that tool to see if can it
> solve your purpose.
yes wal_log_hints or checksums is mandatory. The code contains as well
some safety checks as well to ensure that a node not using those
parameters cannot be rewinded.
Regards,
--
Michael
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