Re: allow online change primary_conninfo

From: Andres Freund <andres(at)anarazel(dot)de>
To: Sergei Kornilov <sk(at)zsrv(dot)org>
Cc: PostgreSQL mailing lists <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: allow online change primary_conninfo
Date: 2018-11-26 17:46:36
Message-ID: 20181126174636.pf5i4md7ptbsgnq5@alap3.anarazel.de
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Hi,

On 2018-11-26 12:30:06 +0300, Sergei Kornilov wrote:
> Hmm... I considered SIGHUP processing was in fast loop and therefore shutdown should be fast. But i recheck code and found a possible long loop without processing SIGHUP (in case we receive new data faster than writes to disk). Ok, i will revert back.
> How about write to WalRcvData only clobbered conninfo?

I'm not sure I understand what you mean? The way I'd solve this is that
that only walreceiver, at startup, writes out its conninfo/slot_name,
sourcing the values from the GUCs. That way there's no issue with values
being overwritten early.

- Andres

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