From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Amit Kapila <amit.kapila16@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Michael Paquier <michael.paquier@gmail.com>
Cc: Dilip Kumar <dilipbalaut@gmail.com>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: Jim Nasby <Jim.Nasby@bluetreble.com>
Cc: Andres Freund <andres@anarazel.de>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: Speed up Clog Access by increasing CLOG buffers
Date: Fri, 10 Mar 2017 19:19:17 -0300
Message-ID: <20170310221917.dijugbcqym35of7o@alvherre.pgsql> (raw)
In-Reply-To: <CA+TgmoanXMjxnr6whEXMpc9Nts2L_sztDV5ck4pviGQ++TNP5A@mail.gmail.com>
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Robert Haas wrote:
> The smoking gun was in 009_twophase_slave.log:
>
> TRAP: FailedAssertion("!(nsubxids == MyPgXact->nxids)", File:
> "clog.c", Line: 288)
>
> ...and then the node shuts down, which is why this hangs forever.
> (Also... what's up with it hanging forever instead of timing out or
> failing or something?)
This bit my while messing with 2PC tests recently. I think it'd be
worth doing something about this, such as causing the test to die if we
request a server to (re)start and it doesn't start or it immediately
crashes. This doesn't solve the problem of a server crashing at a point
not immediately after start, though.
(It'd be very annoying to have to sprinkle the Perl test code with
"assert $server->islive", but perhaps we can add assertions of some kind
in PostgresNode itself).
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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Cc: alvherre@2ndquadrant.com, robertmhaas@gmail.com, amit.kapila16@gmail.com, tgl@sss.pgh.pa.us, michael.paquier@gmail.com, dilipbalaut@gmail.com, tomas.vondra@2ndquadrant.com, Jim.Nasby@bluetreble.com, andres@anarazel.de
Subject: Re: Speed up Clog Access by increasing CLOG buffers
In-Reply-To: <20170310221917.dijugbcqym35of7o@alvherre.pgsql>
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