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|
use strict;
use warnings;
use PostgreSQL::Test::Cluster;
use PostgreSQL::Test::Utils;
use Test::More;
use File::Basename;
my $node_primary = PostgreSQL::Test::Cluster->new('primary');
$node_primary->init(allows_streaming => 1);
$node_primary->append_conf(
'postgresql.conf', q[
allow_in_place_tablespaces = true
log_connections=on
# to avoid "repairing" corruption
full_page_writes=off
log_min_messages=debug2
shared_buffers=1MB
]);
$node_primary->start;
# Create streaming standby linking to primary
my $backup_name = 'my_backup';
$node_primary->backup($backup_name);
my $node_standby = PostgreSQL::Test::Cluster->new('standby');
$node_standby->init_from_backup($node_primary, $backup_name,
has_streaming => 1);
$node_standby->start;
# We'll reset this timeout for each individual query we run.
my $psql_timeout = IPC::Run::timer($PostgreSQL::Test::Utils::timeout_default);
my %psql_primary = (stdin => '', stdout => '', stderr => '');
$psql_primary{run} = IPC::Run::start(
[ 'psql', '-XA', '-f', '-', '-d', $node_primary->connstr('postgres') ],
'<',
\$psql_primary{stdin},
'>',
\$psql_primary{stdout},
'2>',
\$psql_primary{stderr},
$psql_timeout);
my %psql_standby = ('stdin' => '', 'stdout' => '', 'stderr' => '');
$psql_standby{run} = IPC::Run::start(
[ 'psql', '-XA', '-f', '-', '-d', $node_standby->connstr('postgres') ],
'<',
\$psql_standby{stdin},
'>',
\$psql_standby{stdout},
'2>',
\$psql_standby{stderr},
$psql_timeout);
# Create template database with a table that we'll update, to trigger dirty
# rows. Using a template database + preexisting rows makes it a bit easier to
# reproduce, because there's no cache invalidations generated.
$node_primary->safe_psql('postgres',
"CREATE DATABASE conflict_db_template OID = 50000;");
$node_primary->safe_psql(
'conflict_db_template', q[
CREATE TABLE large(id serial primary key, dataa text, datab text);
INSERT INTO large(dataa, datab) SELECT g.i::text, 1 FROM generate_series(1, 4000) g(i);]
);
$node_primary->safe_psql('postgres',
"CREATE DATABASE conflict_db TEMPLATE conflict_db_template OID = 50001;");
$node_primary->safe_psql(
'postgres', q[
CREATE EXTENSION pg_prewarm;
CREATE TABLE replace_sb(data text);
INSERT INTO replace_sb(data) SELECT random()::text FROM generate_series(1, 15000);]
);
$node_primary->wait_for_catchup($node_standby);
# Use longrunning transactions, so that AtEOXact_SMgr doesn't close files
send_query_and_wait(\%psql_primary, q[BEGIN;], qr/BEGIN/m);
send_query_and_wait(\%psql_standby, q[BEGIN;], qr/BEGIN/m);
# Cause lots of dirty rows in shared_buffers
$node_primary->safe_psql('conflict_db', "UPDATE large SET datab = 1;");
# Now do a bunch of work in another database. That will end up needing to
# write back dirty data from the previous step, opening the relevant file
# descriptors
cause_eviction(\%psql_primary, \%psql_standby);
# drop and recreate database
$node_primary->safe_psql('postgres', "DROP DATABASE conflict_db;");
$node_primary->safe_psql('postgres',
"CREATE DATABASE conflict_db TEMPLATE conflict_db_template OID = 50001;");
verify($node_primary, $node_standby, 1, "initial contents as expected");
# Again cause lots of dirty rows in shared_buffers, but use a different update
# value so we can check everything is OK
$node_primary->safe_psql('conflict_db', "UPDATE large SET datab = 2;");
# Again cause a lot of IO. That'll again write back dirty data, but uses newly
# opened file descriptors, so we don't confuse old files with new files despite
# recycling relfilenodes.
cause_eviction(\%psql_primary, \%psql_standby);
verify($node_primary, $node_standby, 2,
"update to reused relfilenode (due to DB oid conflict) is not lost");
$node_primary->safe_psql('conflict_db', "VACUUM FULL large;");
$node_primary->safe_psql('conflict_db', "UPDATE large SET datab = 3;");
verify($node_primary, $node_standby, 3, "restored contents as expected");
# Test for old filehandles after moving a database in / out of tablespace
$node_primary->safe_psql('postgres',
q[CREATE TABLESPACE test_tablespace LOCATION '']);
# cause dirty buffers
$node_primary->safe_psql('conflict_db', "UPDATE large SET datab = 4;");
# cause files to be opened in backend in other database
cause_eviction(\%psql_primary, \%psql_standby);
# move database back / forth
$node_primary->safe_psql('postgres',
'ALTER DATABASE conflict_db SET TABLESPACE test_tablespace');
$node_primary->safe_psql('postgres',
'ALTER DATABASE conflict_db SET TABLESPACE pg_default');
# cause dirty buffers
$node_primary->safe_psql('conflict_db', "UPDATE large SET datab = 5;");
cause_eviction(\%psql_primary, \%psql_standby);
verify($node_primary, $node_standby, 5, "post move contents as expected");
$node_primary->safe_psql('postgres',
'ALTER DATABASE conflict_db SET TABLESPACE test_tablespace');
$node_primary->safe_psql('conflict_db', "UPDATE large SET datab = 7;");
cause_eviction(\%psql_primary, \%psql_standby);
$node_primary->safe_psql('conflict_db', "UPDATE large SET datab = 8;");
$node_primary->safe_psql('postgres', 'DROP DATABASE conflict_db');
$node_primary->safe_psql('postgres', 'DROP TABLESPACE test_tablespace');
$node_primary->safe_psql('postgres', 'REINDEX TABLE pg_database');
# explicitly shut down psql instances gracefully - to avoid hangs
# or worse on windows
$psql_primary{stdin} .= "\\q\n";
$psql_primary{run}->finish;
$psql_standby{stdin} .= "\\q\n";
$psql_standby{run}->finish;
$node_primary->stop();
$node_standby->stop();
# Make sure that there weren't crashes during shutdown
command_like(
[ 'pg_controldata', $node_primary->data_dir ],
qr/Database cluster state:\s+shut down\n/,
'primary shut down ok');
command_like(
[ 'pg_controldata', $node_standby->data_dir ],
qr/Database cluster state:\s+shut down in recovery\n/,
'standby shut down ok');
done_testing();
sub verify
{
my ($primary, $standby, $counter, $message) = @_;
my $query =
"SELECT datab, count(*) FROM large GROUP BY 1 ORDER BY 1 LIMIT 10";
is($primary->safe_psql('conflict_db', $query),
"$counter|4000", "primary: $message");
$primary->wait_for_catchup($standby);
is($standby->safe_psql('conflict_db', $query),
"$counter|4000", "standby: $message");
}
sub cause_eviction
{
my ($psql_primary, $psql_standby) = @_;
send_query_and_wait(
$psql_primary,
q[SELECT SUM(pg_prewarm(oid)) warmed_buffers FROM pg_class WHERE pg_relation_filenode(oid) != 0;],
qr/warmed_buffers/m);
send_query_and_wait(
$psql_standby,
q[SELECT SUM(pg_prewarm(oid)) warmed_buffers FROM pg_class WHERE pg_relation_filenode(oid) != 0;],
qr/warmed_buffers/m);
}
# Send query, wait until string matches
sub send_query_and_wait
{
my ($psql, $query, $untl) = @_;
my $ret;
# For each query we run, we'll restart the timeout. Otherwise the timeout
# would apply to the whole test script, and would need to be set very high
# to survive when running under Valgrind.
$psql_timeout->reset();
$psql_timeout->start();
# send query
$$psql{stdin} .= $query;
$$psql{stdin} .= "\n";
# wait for query results
$$psql{run}->pump_nb();
while (1)
{
last if $$psql{stdout} =~ /$untl/;
if ($psql_timeout->is_expired)
{
BAIL_OUT("aborting wait: program timed out\n"
. "stream contents: >>$$psql{stdout}<<\n"
. "pattern searched for: $untl\n");
return 0;
}
if (not $$psql{run}->pumpable())
{
BAIL_OUT("aborting wait: program died\n"
. "stream contents: >>$$psql{stdout}<<\n"
. "pattern searched for: $untl\n");
return 0;
}
$$psql{run}->pump();
}
$$psql{stdout} = '';
return 1;
}
|
