Horton

Re: Offline enabling/disabling of data checksums

Michael Banck <michael.banck@credativ.de>

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From: Michael Banck <michael.banck@credativ.de>
To: Magnus Hagander <magnus@hagander.net>, Sergei Kornilov <sk@zsrv.org>
Cc: Michael Paquier <michael@paquier.xyz>, Fabien COELHO <coelho@cri.ensmp.fr>, PostgreSQL Developers <pgsql-hackers@lists.postgresql.org>
Date: 2019-03-13T15:46:19Z
Lists: pgsql-hackers 
Hi,

Am Mittwoch, den 13.03.2019, 12:24 +0100 schrieb Magnus Hagander:
> On Wed, Mar 13, 2019 at 11:54 AM Sergei Kornilov <sk@zsrv.org> wrote:
> > One new question from me: how about replication?
> > Case: primary+replica, we shut down primary and enable checksum, and
> > "started streaming WAL from primary" without any issue. I have
> > master with checksums, but replica without.
> > Or cluster with checksums, then disable checksums on primary, but
> > standby think we have checksums.
> 
> Enabling or disabling the checksums offline on the master quite
> clearly requires a rebuild of the standby, there is no other way

What about shutting down both and running pg_checksums --enable on the
standby as well?


Michael

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Commits

  1. Reorganize Notes section in documentation of pg_checksums

  2. Add option -N/--no-sync to pg_checksums

  3. Add options to enable and disable checksums in pg_checksums

  4. Refactor more code logic to update the control file

  5. Rename pg_verify_checksums to pg_checksums

  6. Fix cross-version compatibility checks of pg_verify_checksums

  7. Add routine able to update the control file to src/common/