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# Copyright (c) 2021-2022, PostgreSQL Global Development Group
# Test for timeline switch
use strict;
use warnings;
use File::Path qw(rmtree);
use PostgreSQL::Test::Cluster;
use PostgreSQL::Test::Utils;
use Test::More;
$ENV{PGDATABASE} = 'postgres';
# Ensure that a cascading standby is able to follow a newly-promoted standby
# on a new timeline.
# Initialize primary node
my $node_primary = PostgreSQL::Test::Cluster->new('primary');
$node_primary->init(allows_streaming => 1);
$node_primary->start;
# Take backup
my $backup_name = 'my_backup';
$node_primary->backup($backup_name);
# Create two standbys linking to it
my $node_standby_1 = PostgreSQL::Test::Cluster->new('standby_1');
$node_standby_1->init_from_backup($node_primary, $backup_name,
has_streaming => 1);
$node_standby_1->start;
my $node_standby_2 = PostgreSQL::Test::Cluster->new('standby_2');
$node_standby_2->init_from_backup($node_primary, $backup_name,
has_streaming => 1);
$node_standby_2->start;
# Create some content on primary
$node_primary->safe_psql('postgres',
"CREATE TABLE tab_int AS SELECT generate_series(1,1000) AS a");
# Wait until standby has replayed enough data on standby 1
$node_primary->wait_for_catchup($node_standby_1);
# Stop and remove primary
$node_primary->teardown_node;
# promote standby 1 using "pg_promote", switching it to a new timeline
my $psql_out = '';
$node_standby_1->psql(
'postgres',
"SELECT pg_promote(wait_seconds => 300)",
stdout => \$psql_out);
is($psql_out, 't', "promotion of standby with pg_promote");
# Switch standby 2 to replay from standby 1
my $connstr_1 = $node_standby_1->connstr;
$node_standby_2->append_conf(
'postgresql.conf', qq(
primary_conninfo='$connstr_1'
));
$node_standby_2->restart;
# Insert some data in standby 1 and check its presence in standby 2
# to ensure that the timeline switch has been done.
$node_standby_1->safe_psql('postgres',
"INSERT INTO tab_int VALUES (generate_series(1001,2000))");
$node_standby_1->wait_for_catchup($node_standby_2);
my $result =
$node_standby_2->safe_psql('postgres', "SELECT count(*) FROM tab_int");
is($result, qq(2000), 'check content of standby 2');
# Ensure that a standby is able to follow a primary on a newer timeline
# when WAL archiving is enabled.
# Initialize primary node
my $node_primary_2 = PostgreSQL::Test::Cluster->new('primary_2');
$node_primary_2->init(allows_streaming => 1, has_archiving => 1);
$node_primary_2->append_conf(
'postgresql.conf', qq(
wal_keep_size = 512MB
));
$node_primary_2->start;
# Take backup
$node_primary_2->backup($backup_name);
# Create standby node
my $node_standby_3 = PostgreSQL::Test::Cluster->new('standby_3');
$node_standby_3->init_from_backup($node_primary_2, $backup_name,
has_streaming => 1);
# Restart primary node in standby mode and promote it, switching it
# to a new timeline.
$node_primary_2->set_standby_mode;
$node_primary_2->restart;
$node_primary_2->promote;
# Start standby node, create some content on primary and check its presence
# in standby, to ensure that the timeline switch has been done.
$node_standby_3->start;
$node_primary_2->safe_psql('postgres',
"CREATE TABLE tab_int AS SELECT 1 AS a");
$node_primary_2->wait_for_catchup($node_standby_3);
my $result_2 =
$node_standby_3->safe_psql('postgres', "SELECT count(*) FROM tab_int");
is($result_2, qq(1), 'check content of standby 3');
done_testing();
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