Horton

Re: Skipping logical replication transactions on subscriber side

Amit Kapila <amit.kapila16@gmail.com>

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From: Amit Kapila <amit.kapila16@gmail.com>
To: Masahiko Sawada <sawada.mshk@gmail.com>
Cc: Peter Eisentraut <peter.eisentraut@enterprisedb.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2021-07-05T10:24:57Z
Lists: pgsql-hackers 
On Mon, Jul 5, 2021 at 3:16 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
>
> On Thu, Jul 1, 2021 at 6:31 PM Masahiko Sawada <sawada.mshk@gmail.com> wrote:
> >
> > On Thu, Jul 1, 2021 at 12:56 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
>
> Instead of using the syntax "ALTER SUBSCRIPTION name SET SKIP
> TRANSACTION Iconst", isn't it better to use it as a subscription
> option like Mark has done for his patch (disable_on_error)?
>
> I am slightly nervous about this way of allowing the user to skip the
> errors because if it is not used carefully then it can easily lead to
> inconsistent data on the subscriber. I agree that as only superusers
> will be allowed to use this option and we can document clearly the
> side-effects, the risk could be reduced but is that sufficient?
>

I see that users can create a similar effect by using
pg_replication_origin_advance() and it is mentioned in the docs that
careless use of this function can lead to inconsistently replicated
data. So, this new way doesn't seem to be any more dangerous than what
we already have.

-- 
With Regards,
Amit Kapila.

Commits

  1. Test ALIGNOF_DOUBLE==4 compatibility under ALIGNOF_DOUBLE==8.

  2. Reorder subskiplsn in pg_subscription to avoid alignment issues.

  3. Add ALTER SUBSCRIPTION ... SKIP.

  4. Optionally disable subscriptions on error.

  5. Update docs of logical replication for commit 8d74fc96db.

  6. Respect permissions within logical replication.

  7. Fix regression test failure caused by commit 8d74fc96db.

  8. Add a view to show the stats of subscription workers.

  9. Add logical change details to logical replication worker errcontext.

  10. Rename LOGICAL_REP_MSG_STREAM_END to LOGICAL_REP_MSG_STREAM_STOP.

  11. Fix typo in protocol.sgml.

  12. Remove unused argument in apply_handle_commit_internal().

  13. Fix replication of in-progress transactions in tablesync worker.

  14. Reorder pg_sequence columns to avoid alignment issue