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Add more tests for commit_timestamp feature

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These tests verify that 1) WAL replay preserves the stored value,
2) a streaming standby server replays the value obtained from the
master, and 3) the behavior is sensible in the face of repeated
configuration changes.

One annoyance is that tmp_check/ subdir from the TAP tests is clobbered
when the pg_regress test runs in the same subdirectory.  This is
bothersome but not too terrible a problem, since the pg_regress test is
not run anyway if the TAP tests fail (unless "make -k" is used).

I had these tests around since commit 69e7235c93e2; add them now that we
have the recovery test framework in place.
This commit is contained in:
Alvaro Herrera 2016-03-01 19:53:18 -03:00
parent 88802e0680
commit 9def031bd2
4 changed files with 145 additions and 0 deletions
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5
src/test/modules/commit_ts/Makefile
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@ -3,6 +3,11 @@
REGRESS = commit_timestamp
REGRESS_OPTS = --temp-config=$(top_srcdir)/src/test/modules/commit_ts/commit_ts.conf
check: prove-check
prove-check:
$(prove_check)
ifdef USE_PGXS
PG_CONFIG = pg_config
PGXS := $(shell $(PG_CONFIG) --pgxs)

29
src/test/modules/commit_ts/t/001_base.pl Normal file
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@ -0,0 +1,29 @@
# Single-node test: value can be set, and is still present after recovery
use strict;
use warnings;
use TestLib;
use Test::More tests => 2;
use PostgresNode;
my $node = get_new_node();
$node->init;
$node->append_conf('postgresql.conf', 'track_commit_timestamp = on');
$node->start;
# Create a table, compare "now()" to the commit TS of its xmin
$node->psql('postgres', 'create table t as select now from (select now(), pg_sleep(1)) f');
my $true = $node->psql('postgres',
'select t.now - ts.* < \'1s\' from t, pg_class c, pg_xact_commit_timestamp(c.xmin) ts where relname = \'t\'');
is($true, 't', 'commit TS is set');
my $ts = $node->psql('postgres',
'select ts.* from pg_class, pg_xact_commit_timestamp(xmin) ts where relname = \'t\'');
# Verify that we read the same TS after crash recovery
$node->stop('immediate');
$node->start;
my $recovered_ts = $node->psql('postgres',
'select ts.* from pg_class, pg_xact_commit_timestamp(xmin) ts where relname = \'t\'');
is($recovered_ts, $ts, 'commit TS remains after crash recovery');

55
src/test/modules/commit_ts/t/002_standby.pl Normal file
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@ -0,0 +1,55 @@
# Test simple scenario involving a standby
use strict;
use warnings;
use TestLib;
use Test::More tests => 2;
use PostgresNode;
my $bkplabel = 'backup';
my $master = get_new_node('master');
$master->init(allows_streaming => 1);
$master->append_conf('postgresql.conf', qq{
track_commit_timestamp = on
max_wal_senders = 5
wal_level = hot_standby
});
$master->start;
$master->backup($bkplabel);
my $standby = get_new_node('standby');
$standby->init_from_backup($master, $bkplabel, has_streaming => 1);
$standby->start;
for my $i (1 .. 10)
{
$master->psql('postgres', "create table t$i()");
}
my $master_ts = $master->psql('postgres',
qq{SELECT ts.* FROM pg_class, pg_xact_commit_timestamp(xmin) AS ts WHERE relname = 't10'});
my $master_lsn = $master->psql('postgres',
'select pg_current_xlog_location()');
$standby->poll_query_until('postgres',
qq{SELECT '$master_lsn'::pg_lsn <= pg_last_xlog_replay_location()})
or die "slave never caught up";
my $standby_ts = $standby->psql('postgres',
qq{select ts.* from pg_class, pg_xact_commit_timestamp(xmin) ts where relname = 't10'});
is($master_ts, $standby_ts, "standby gives same value as master");
$master->append_conf('postgresql.conf', 'track_commit_timestamp = off');
$master->restart;
$master->psql('postgres', 'checkpoint');
$master_lsn = $master->psql('postgres',
'select pg_current_xlog_location()');
$standby->poll_query_until('postgres',
qq{SELECT '$master_lsn'::pg_lsn <= pg_last_xlog_replay_location()})
or die "slave never caught up";
$standby->psql('postgres', 'checkpoint');
# This one should raise an error now
$standby_ts = $standby->psql('postgres',
'select ts.* from pg_class, pg_xact_commit_timestamp(xmin) ts where relname = \'t10\'');
is($standby_ts, '', "standby gives no value when master turned feature off");

56
src/test/modules/commit_ts/t/003_standby_2.pl Normal file
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@ -0,0 +1,56 @@
# Test master/standby scenario where the track_commit_timestamp GUC is
# repeatedly toggled on and off.
use strict;
use warnings;
use TestLib;
use Test::More tests => 2;
use PostgresNode;
my $bkplabel = 'backup';
my $master = get_new_node('master');
$master->init(allows_streaming => 1);
$master->append_conf('postgresql.conf', qq{
track_commit_timestamp = on
max_wal_senders = 5
wal_level = hot_standby
});
$master->start;
$master->backup($bkplabel);
my $standby = get_new_node('standby');
$standby->init_from_backup($master, $bkplabel, has_streaming => 1);
$standby->start;
for my $i (1 .. 10)
{
$master->psql('postgres', "create table t$i()");
}
$master->append_conf('postgresql.conf', 'track_commit_timestamp = off');
$master->restart;
$master->psql('postgres', 'checkpoint');
my $master_lsn = $master->psql('postgres',
'select pg_current_xlog_location()');
$standby->poll_query_until('postgres',
qq{SELECT '$master_lsn'::pg_lsn <= pg_last_xlog_replay_location()})
or die "slave never caught up";
$standby->psql('postgres', 'checkpoint');
$standby->restart;
my $standby_ts = $standby->psql('postgres',
qq{SELECT ts.* FROM pg_class, pg_xact_commit_timestamp(xmin) AS ts WHERE relname = 't10'});
is($standby_ts, '', "standby does not return a value after restart");
$master->append_conf('postgresql.conf', 'track_commit_timestamp = on');
$master->restart;
$master->append_conf('postgresql.conf', 'track_commit_timestamp = off');
$master->restart;
system_or_bail('pg_ctl', '-w', '-D', $standby->data_dir, 'promote');
$standby->poll_query_until('postgres', "SELECT pg_is_in_recovery() <> true");
$standby->psql('postgres', "create table t11()");
$standby_ts = $standby->psql('postgres',
qq{SELECT ts.* FROM pg_class, pg_xact_commit_timestamp(xmin) AS ts WHERE relname = 't11'});
isnt($standby_ts, '', "standby gives valid value ($standby_ts) after promotion");