| From: | Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> |
|---|---|
| To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Cc: | PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Peter Eisentraut <peter(at)eisentraut(dot)org>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Euler Taveira <euler(at)eulerto(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>, Hou, Zhijie/侯 志杰 <houzj(dot)fnst(at)fujitsu(dot)com>, Sawada Masahiko <sawada(dot)mshk(at)gmail(dot)com>, "Katz, Jonathan" <jkatz(at)amazon(dot)com> |
| Subject: | Re: Logical Replication of sequences |
| Date: | 2024-06-04 14:09:46 |
| Message-ID: | CAExHW5sOiopw80HVdRX0YRthc+V4=bLtv6GwEQtpE+5xxYpdTQ@mail.gmail.com |
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On Tue, Jun 4, 2024 at 4:27 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
>
> 3. Replicate published sequences via walsender at the time of shutdown
> or incrementally while decoding checkpoint record. The two ways to
> achieve this are: (a) WAL log a special NOOP record just before
> shutting down checkpointer. Then allow the WALsender to read the
> sequence data and send it to the subscriber while decoding the new
> NOOP record. (b) Similar to the previous idea but instead of WAL
> logging a new record directly invokes a decoding callback after
> walsender receives a request to shutdown which will allow pgoutput to
> read and send required sequences. This approach has a drawback that we
> are adding more work at the time of shutdown but note that we already
> waits for all the WAL records to be decoded and sent before shutting
> down the walsender during shutdown of the node.
>
> Any other ideas?
>
>
In case of primary crash the sequence won't get replicated. That is true
even with the previous approach in case walsender is shut down because of a
crash, but it is more serious with this approach. How about periodically
sending this information?
--
Best Wishes,
Ashutosh Bapat
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