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Re: We should Axe /contrib/start-scripts

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: "Josh Berkus" <josh(at)agliodbs(dot)com>, "Chander Ganesan" <chander(at)otg-nc(dot)com>, "PostgreSQL-development" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: We should Axe /contrib/start-scripts
Date: 2009-08-19 22:13:00
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
"Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> writes:
> Right -- we did run into this in spades when our backup server,
> running dozens of instances of PostgreSQL in "warm standby" to confirm
> the integrity of the files received, crashed hard.  I wasn't sure if
> this was the problem being addressed.  One obvious solution, which we
> now rigorously observe, is to use a different OS user for each
> PostgreSQL instance.  I assume that pg_ctl is safe in such an
> environment?

Well, using a different user per instance is a good idea because then
the safety analysis I gave holds rigorously for each instance.  It
doesn't get you out of the problem by itself, because the problem as
described can happen with just one instance.
> It must buy something in our environment, because our attempts to use
> the sample script with minimal modification were problematic. 
> Unfortunately I forget the details, but our problems vanished when we
> switched to pg_ctl.  (Well, except for that one unfortunate episode
> mentioned above.)

Hmm.  As stated, I would expect pg_ctl to make it worse.  It would be
interesting to have a closer look at your before-and-after scripts.

			regards, tom lane

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