| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | "Jonathan S(dot) Katz" <jkatz(at)postgresql(dot)org> |
| Cc: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Dave Cramer <davecramer(at)postgres(dot)rocks>, Michael Paquier <michael(at)paquier(dot)xyz>, Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com>, Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, Vladimir Sitnikov <sitnikov(dot)vladimir(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Peter Geoghegan <pg(at)bowt(dot)ie> |
| Subject: | Re: SIGSEGV from START_REPLICATION 0/XXXXXXX in XLogSendPhysical () at walsender.c:2762 |
| Date: | 2020-06-21 20:02:34 |
| Message-ID: | 20200621200234.k5bdlb2emegl7g2i@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2020-06-21 13:45:36 -0400, Jonathan S. Katz wrote:
> The PG13 RMT had a discussion about this thread, and while the initial
> crash has been fixed, we decided to re-open the Open Item around whether
> we should allow physical replication to be initiated in a logical
> replication session.
Since this is a long-time issue, this doesn't quite seem like an issue
for the RMT?
> We anticipate a resolution for PG13, whether it is explicitly
> disallowing physical replication from occurring on a logical replication
> slot, maintaining the status quo, or something else such that there is
> consensus on the approach.
s/logical replication slot/logical replication connection/?
I still maintain that adding restrictions here is a bad idea. Even
disregarding the discussion of running normal queries interspersed, it's
useful to be able to both request WAL and receive logical changes over
the same connection. E.g. for creating a logical replica by first doing
a physical base backup (vastly faster), or fetching WAL for decoding
large transactions onto a standby.
And I just don't see any reasons to disallow it. There's basically no
reduction in complexity by doing so.
Greetings,
Andres Freund
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