Re: [PATCH] Fix minor race in commit_ts SLRU truncation vs lookups

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>
Cc: Craig Ringer <craig(at)2ndquadrant(dot)com>, Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [PATCH] Fix minor race in commit_ts SLRU truncation vs lookups
Date: 2017-01-19 21:27:34
Message-ID: 20170119212734.z3diu76e6alwnek3@alvherre.pgsql
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Peter Eisentraut wrote:
> On 12/29/16 4:28 AM, Craig Ringer wrote:
> > On 29 December 2016 at 16:51, Craig Ringer <craig(at)2ndquadrant(dot)com> wrote:
> >> On 28 December 2016 at 22:16, Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com> wrote:
> >>
> >>> About the patch, it looks good to me for master with the minor exception
> >>> that:
> >>>> + appendStringInfo(buf, "pageno %d, xid %u",
> >>>> + trunc.pageno, trunc.oldestXid);
> >>>
> >>> This should probably say oldestXid instead of xid in the text description.
> >>
> >> Agreed.
> >
> > Slightly amended attached.
>
> I've looked over this. It looks correct to me in principle.

Thanks, pushed. I added a comment in vacuum.c, as well as removing the
memcpy()s of the xlog record, which were unnecessary now that there's an
intermediate struct. WAL version bumped.

--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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