| From: | shveta malik <shveta(dot)malik(at)gmail(dot)com> |
|---|---|
| To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Cc: | Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com>, "Zhijie Hou (Fujitsu)" <houzj(dot)fnst(at)fujitsu(dot)com>, Bertrand Drouvot <bertranddrouvot(dot)pg(at)gmail(dot)com>, Ajin Cherian <itsajin(at)gmail(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Nisha Moond <nisha(dot)moond412(at)gmail(dot)com>, "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, shveta malik <shveta(dot)malik(at)gmail(dot)com> |
| Subject: | Re: Synchronizing slots from primary to standby |
| Date: | 2024-04-04 12:01:45 |
| Message-ID: | CAJpy0uC9vTE0Ms-=fhr0RFMABKgzqfvfoNXgnbJ=ENrhT-q86A@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Apr 4, 2024 at 2:59 PM shveta malik <shveta(dot)malik(at)gmail(dot)com> wrote:
>
>
> Prior to commit 2ec005b, this check was okay, as we did not expect
> restart_lsn of the synced slot to be ahead of remote since we were
> directly copying the lsns. But now when we use 'advance' to do logical
> decoding on standby, there is a possibility that restart lsn of the
> synced slot is ahead of remote slot, if there are running txns records
> found after reaching consistent-point while consuming WALs from
> restart_lsn till confirmed_lsn. In such a case, slot-sync's advance
> may end up serializing snapshots and setting restart_lsn to the
> serialized snapshot point, ahead of remote one.
>
> Fix:
> The sanity check needs to be corrected. Attached a patch to address the issue.
Please find v2 which has detailed commit-msg and some more comments in code.
thanks
Shveta
| Attachment | Content-Type | Size |
|---|---|---|
| v2-0001-Correct-sanity-check-to-compare-confirmed_lsn.patch | application/octet-stream | 5.0 KB |
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