From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Marko Tiikkaja <marko@joh.to>
Cc: Michael Paquier <michael.paquier@gmail.com>
Cc: PostgreSQL mailing lists <pgsql-bugs@postgresql.org>
Subject: Re: BUG #14830: Missed NOTIFications, PostgreSQL 9.1.24
Date: Tue, 10 Oct 2017 10:54:26 -0400
Message-ID: <18082.1507647266@sss.pgh.pa.us> (raw)
In-Reply-To: <16671.1507645188@sss.pgh.pa.us>
References: <20171010140621.u4avva4cxylwpyew@alvherre.pgsql>
<16671.1507645188@sss.pgh.pa.us>
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I wrote:
> ... I'm a bit hesitant to put a GetSnapshotData
> call into ProcessIncomingNotify, because of the possibility of adding a
> lot of contention on the ProcArray if there's very heavy notify traffic.
Wait, I have an idea. Let's fetch a snapshot at the top of
ProcessIncomingNotify, and then use the snapshot to decide whether
xids are running, instead of calling TransactionIdIsInProgress.
GetSnapshotData is probably a bit heavier than a single
TransactionIdIsInProgress call, but if we have to process multiple
messages then this should be a net savings in ProcArray traffic.
regards, tom lane
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To: pgsql-bugs@postgresql.org
Cc: tgl@sss.pgh.pa.us, alvherre@alvh.no-ip.org, marko@joh.to, michael.paquier@gmail.com
Subject: Re: BUG #14830: Missed NOTIFications, PostgreSQL 9.1.24
In-Reply-To: <18082.1507647266@sss.pgh.pa.us>
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