From: Tom Lane <tgl@sss.pgh.pa.us>
To: pgsql-hackers@postgresql.org
Subject: Re: Race-like failure in recovery/t/009_twophase.pl
Date: Sun, 02 Jul 2017 17:10:31 -0400
Message-ID: <14837.1499029831@sss.pgh.pa.us> (raw)
In-Reply-To: <2588.1499028049@sss.pgh.pa.us>
References: <908.1498965681@sss.pgh.pa.us>
<2588.1499028049@sss.pgh.pa.us>
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I wrote:
> Any ideas what's wrong there?
Hah: the answer is that query_hash's split() call is broken.
"man perlfunc" quoth
split Splits the string EXPR into a list of strings and returns that
list. By default, empty leading fields are preserved, and
empty trailing ones are deleted.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
In the case at hand, the SQL query returns something like
"|physical|||t|10338|||0/302B7E8" with normal timing, but with
enough delay in there, you get "|physical|||t|11542|||" which
triggers split's default behavior of ignoring the trailing empty
fields. It looks like the way to get split to not do that is
to pass it a "limit" of -1.
regards, tom lane
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To: pgsql-hackers@postgresql.org
Cc: tgl@sss.pgh.pa.us
Subject: Re: Race-like failure in recovery/t/009_twophase.pl
In-Reply-To: <14837.1499029831@sss.pgh.pa.us>
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