From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Robert Haas <robertmhaas@gmail.com>
Cc: Michael Paquier <michael@paquier.xyz>
Cc: Andres Freund <andres@anarazel.de>
Cc: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Subject: Re: TopoSort() fix
Date: Tue, 30 Jul 2019 00:06:02 -0400
Message-ID: <19329.1564459562@sss.pgh.pa.us> (raw)
In-Reply-To: <20190730032157.GA652@alvherre.pgsql>
References: <20190730032157.GA652@alvherre.pgsql>
Alvaro Herrera <alvherre@2ndquadrant.com> writes:
> On 2019-Jul-29, Tom Lane wrote:
>> FYI, I just got done inventing a way to reach that code, and I have
>> to suspect that it's impossible to do so in production, because under
>> ordinary circumstances no parallel worker will take any exclusive lock
>> that isn't already held by its leader.
> Hmm, okay, so this wasn't a bug that would have bit anyone in practice,
> yeah? That's reassuring.
At the least, you'd have to go well out of your way to make it happen.
regards, tom lane
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To: pgsql-hackers@postgresql.org
Cc: tgl@sss.pgh.pa.us, alvherre@2ndquadrant.com, robertmhaas@gmail.com, michael@paquier.xyz, andres@anarazel.de
Subject: Re: TopoSort() fix
In-Reply-To: <19329.1564459562@sss.pgh.pa.us>
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