mirrors/postgres
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Remove recovery test 011_crash_recovery.pl

Browse Source 
This test has been added as of 857ee8e that has introduced the SQL
function txid_status(), with the purpose of checking that a transaction
ID still in-progress during a crash is correctly marked as aborted after
recovery finishes.

This test is unstable, and some configuration scenarios may that easier
to reproduce (wal_level=minimal, wal_compression=on) because the WAL
holding the information about the in-progress transaction ID may not
have made it to disk yet, hence a post-crash recovery may cause the same
XID to be reused, triggering a test failure.

We have discussed a few approaches, like making this function force a
WAL flush to make it reliable across crashes, but we don't want to pay a
performance penalty in some scenarios, as well.  The test could have
been tweaked to enforce a checkpoint but that actually breaks the
promise of the test to rely on a stable result of txid_status() after
a crash.

This issue has been reported a few times across the past years, with an
original report from Kyotaro Horiguchi.  The buildfarm machines tanager,
hachi and gokiburi enable wal_compression, and fail on this test
periodically.

Discussion: https://postgr.es/m/3163112.1674762209@sss.pgh.pa.us
Discussion: https://postgr.es/m/20210305.115011.558061052471425531.horikyota.ntt@gmail.com
Backpatch-through: 11
This commit is contained in:
Michael Paquier 2023-01-31 12:47:15 +09:00
parent 1a5afe0077
commit ee11824ac4
1 changed files with 0 additions and 68 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

68
src/test/recovery/t/011_crash_recovery.pl
View File

@ -1,68 +0,0 @@
#
# Tests relating to PostgreSQL crash recovery and redo
#
use strict;
use warnings;
use PostgresNode;
use TestLib;
use Test::More;
use Config;
if ($Config{osname} eq 'MSWin32')
{
# some Windows Perls at least don't like IPC::Run's start/kill_kill regime.
plan skip_all => "Test fails on Windows perl";
}
else
{
plan tests => 3;
}
my $node = get_new_node('master');
$node->init(allows_streaming => 1);
$node->start;
my ($stdin, $stdout, $stderr) = ('', '', '');
# Ensure that pg_xact_status reports 'aborted' for xacts
# that were in-progress during crash. To do that, we need
# an xact to be in-progress when we crash and we need to know
# its xid.
my $tx = IPC::Run::start(
[
'psql', '-X', '-qAt', '-v', 'ON_ERROR_STOP=1', '-f', '-', '-d',
$node->connstr('postgres')
],
'<',
\$stdin,
'>',
\$stdout,
'2>',
\$stderr);
$stdin .= q[
BEGIN;
CREATE TABLE mine(x integer);
SELECT pg_current_xact_id();
];
$tx->pump until $stdout =~ /[[:digit:]]+[\r\n]$/;
# Status should be in-progress
my $xid = $stdout;
chomp($xid);
is($node->safe_psql('postgres', qq[SELECT pg_xact_status('$xid');]),
'in progress', 'own xid is in-progress');
# Crash and restart the postmaster
$node->stop('immediate');
$node->start;
# Make sure we really got a new xid
cmp_ok($node->safe_psql('postgres', 'SELECT pg_current_xact_id()'),
'>', $xid, 'new xid after restart is greater');
# and make sure we show the in-progress xact as aborted
is($node->safe_psql('postgres', qq[SELECT pg_xact_status('$xid');]),
'aborted', 'xid is aborted after crash');
$tx->kill_kill;