From: | Michael Beattie <mtbeedee(at)gmail(dot)com> |
---|---|
To: | Magnus Hagander <magnus(at)hagander(dot)net> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: FATAL: bogus data in lock file "postmaster.pid": "" |
Date: | 2012-01-06 13:28:48 |
Message-ID: | CAJ=Gs0Kjw9iEnuxOL6J_8NvR6SH6rrsSbL9Gy1t_-pFKNR8dtg@mail.gmail.com |
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On Fri, Jan 6, 2012 at 6:13 AM, Magnus Hagander <magnus(at)hagander(dot)net> wrote:
> On Thu, Jan 5, 2012 at 23:19, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> > Magnus Hagander <magnus(at)hagander(dot)net> writes:
> >> On Thu, Jan 5, 2012 at 17:13, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> >>> I think link(2) would create race conditions of its own. I'd be
> >>> inclined to suggest that maybe we should just special-case a zero
> length
> >>> postmaster.pid file as meaning "okay to proceed". In general, garbage
> >
> >> That's pretty much what I meant - but with a warning message.
> >
> > Actually ... wait a minute. If we allow that, don't we create a race
> > condition between two postmasters starting at almost the same instant?
> > The second one could see the lock file when the first has created but
> > not yet filled it.
>
> Good point, yeah, it should do that. But I still think it's rare
> enough that just special-casing the error message should be enough...
>
>
so just something that does like
stat(filename, &st);
size = st.st_size;
if (size == 0)
elog(ERROR, "lock file \"%s\" has 0 length.", filename);
somewhere in CreateLockFile in miscinit.c?
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