Re: postmaster.pid

From: Dan Langille <dan(at)langille(dot)org>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: am(at)fx(dot)ro, <pgsql-general(at)postgresql(dot)org>
Subject: Re: postmaster.pid
Date: 2003-01-03 22:38:47
Message-ID: 20030103173657.O91507-100000@m20.unixathome.org
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On Fri, 3 Jan 2003, Tom Lane wrote:

> Note also that under most circumstances, a stale postmaster.pid file
> should not prevent the postmaster from starting (because it will ignore
> the old .pid file if it can see that there is no process with that PID
> alive anymore). The case where you lose is only when there is another
> process running that by chance has the same PID that was assigned to the
> old postmaster on the system's previous uptime cycle. The postmaster
> can't tell that such a process isn't really a conflicting postmaster,
> so it gives up for safety's sake.

This is a situation which I've often wondered about, for other scripts,
not PostgreSQL. I've not found a happy solution yet.

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