| From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
|---|---|
| To: | Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> |
| Cc: | Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, "tanghy(dot)fnst(at)fujitsu(dot)com" <tanghy(dot)fnst(at)fujitsu(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Greg Nancarrow <gregn4422(at)gmail(dot)com>, "houzj(dot)fnst(at)fujitsu(dot)com" <houzj(dot)fnst(at)fujitsu(dot)com>, "osumi(dot)takamichi(at)fujitsu(dot)com" <osumi(dot)takamichi(at)fujitsu(dot)com>, Alexey Lesovsky <lesovsky(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Skipping logical replication transactions on subscriber side |
| Date: | 2022-01-25 14:58:00 |
| Message-ID: | CAKFQuwa4GUDTqkjdmhrt=4XREX=GTjFhfoRdG6X0uocwtpGvxA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Jan 25, 2022 at 7:47 AM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>
wrote:
> Yeah, I think it's a good idea to clear the subskipxid after the first
> transaction regardless of whether the worker skipped it.
>
>
So basically instead of stopping the worker with an error you suggest
having the worker continue applying changes (after resetting subskipxid,
and - arguably - the ?_error_* fields). Log the transaction xid mis-match
as a warning in the log file as opposed to an error.
I was supposing to make it an error and have the worker stop again since in
a system where the xid is verified and the code is bug-free I would expect
the situation to be a "can't happen" one and I'd rather error in that
circumstance than warn. The DBA will have to go and ALTER SUBSCRIPTION
SKIP (xid = NONE) to get the worker working again but I find that
acceptable in this case.
David J.
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