From fcd77d53217b4c4049d176072a1763d6e11ca478 Mon Sep 17 00:00:00 2001 From: Andres Freund Date: Sat, 8 Apr 2023 02:24:50 -0700 Subject: [PATCH] TAP test for logical decoding on standby MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Author: "Drouvot, Bertrand" Author: Amit Khandekar Author: Craig Ringer (in an older version) Author: Andres Freund Reviewed-by: "Drouvot, Bertrand" Reviewed-by: Andres Freund Reviewed-by: Robert Haas Reviewed-by: Amit Kapila Reviewed-by: Fabrízio de Royes Mello --- src/test/perl/PostgreSQL/Test/Cluster.pm | 37 + src/test/recovery/meson.build | 1 + .../t/035_standby_logical_decoding.pl | 734 ++++++++++++++++++ 3 files changed, 772 insertions(+) create mode 100644 src/test/recovery/t/035_standby_logical_decoding.pl diff --git a/src/test/perl/PostgreSQL/Test/Cluster.pm b/src/test/perl/PostgreSQL/Test/Cluster.pm index f3e36538d7..6f7f4e5de4 100644 --- a/src/test/perl/PostgreSQL/Test/Cluster.pm +++ b/src/test/perl/PostgreSQL/Test/Cluster.pm @@ -3029,6 +3029,43 @@ $SIG{TERM} = $SIG{INT} = sub { =pod +=item $node->create_logical_slot_on_standby(self, primary, slot_name, dbname) + +Create logical replication slot on given standby + +=cut + +sub create_logical_slot_on_standby +{ + my ($self, $primary, $slot_name, $dbname) = @_; + my ($stdout, $stderr); + + my $handle; + + $handle = IPC::Run::start(['pg_recvlogical', '-d', $self->connstr($dbname), '-P', 'test_decoding', '-S', $slot_name, '--create-slot'], '>', \$stdout, '2>', \$stderr); + + # Once the slot's restart_lsn is determined, the standby looks for + # xl_running_xacts WAL record from the restart_lsn onwards. First wait + # until the slot restart_lsn is determined. + + $self->poll_query_until( + 'postgres', qq[ + SELECT restart_lsn IS NOT NULL + FROM pg_catalog.pg_replication_slots WHERE slot_name = '$slot_name' + ]) or die "timed out waiting for logical slot to calculate its restart_lsn"; + + # Then arrange for the xl_running_xacts record for which pg_recvlogical is + # waiting. + $primary->safe_psql('postgres', 'SELECT pg_log_standby_snapshot()'); + + $handle->finish(); + + is($self->slot($slot_name)->{'slot_type'}, 'logical', $slot_name . ' on standby created') + or die "could not create slot" . $slot_name; +} + +=pod + =back =cut diff --git a/src/test/recovery/meson.build b/src/test/recovery/meson.build index 59465b97f3..e834ad5e0d 100644 --- a/src/test/recovery/meson.build +++ b/src/test/recovery/meson.build @@ -40,6 +40,7 @@ tests += { 't/032_relfilenode_reuse.pl', 't/033_replay_tsp_drops.pl', 't/034_create_database.pl', + 't/035_standby_logical_decoding.pl', ], }, } diff --git a/src/test/recovery/t/035_standby_logical_decoding.pl b/src/test/recovery/t/035_standby_logical_decoding.pl new file mode 100644 index 0000000000..150290bbcd --- /dev/null +++ b/src/test/recovery/t/035_standby_logical_decoding.pl @@ -0,0 +1,734 @@ +# Copyright (c) 2023, PostgreSQL Global Development Group + +# logical decoding on standby : test logical decoding, +# recovery conflict and standby promotion. + +use strict; +use warnings; + +use PostgreSQL::Test::Cluster; +use PostgreSQL::Test::Utils; +use Test::More; + +my ($stdin, $stdout, $stderr, $cascading_stdout, $cascading_stderr, $ret, $handle, $slot); + +my $node_primary = PostgreSQL::Test::Cluster->new('primary'); +my $node_standby = PostgreSQL::Test::Cluster->new('standby'); +my $node_cascading_standby = PostgreSQL::Test::Cluster->new('cascading_standby'); +my $default_timeout = $PostgreSQL::Test::Utils::timeout_default; +my $res; + +# Name for the physical slot on primary +my $primary_slotname = 'primary_physical'; +my $standby_physical_slotname = 'standby_physical'; + +# find $pat in logfile of $node after $off-th byte +sub find_in_log +{ + my ($node, $pat, $off) = @_; + + $off = 0 unless defined $off; + my $log = PostgreSQL::Test::Utils::slurp_file($node->logfile); + return 0 if (length($log) <= $off); + + $log = substr($log, $off); + + return $log =~ m/$pat/; +} + +# Fetch xmin columns from slot's pg_replication_slots row, after waiting for +# given boolean condition to be true to ensure we've reached a quiescent state. +sub wait_for_xmins +{ + my ($node, $slotname, $check_expr) = @_; + + $node->poll_query_until( + 'postgres', qq[ + SELECT $check_expr + FROM pg_catalog.pg_replication_slots + WHERE slot_name = '$slotname'; + ]) or die "Timed out waiting for slot xmins to advance"; +} + +# Create the required logical slots on standby. +sub create_logical_slots +{ + my ($node, $slot_prefix) = @_; + + my $active_slot = $slot_prefix . 'activeslot'; + my $inactive_slot = $slot_prefix . 'inactiveslot'; + $node->create_logical_slot_on_standby($node_primary, qq($inactive_slot), 'testdb'); + $node->create_logical_slot_on_standby($node_primary, qq($active_slot), 'testdb'); +} + +# Drop the logical slots on standby. +sub drop_logical_slots +{ + my ($slot_prefix) = @_; + my $active_slot = $slot_prefix . 'activeslot'; + my $inactive_slot = $slot_prefix . 'inactiveslot'; + + $node_standby->psql('postgres', qq[SELECT pg_drop_replication_slot('$inactive_slot')]); + $node_standby->psql('postgres', qq[SELECT pg_drop_replication_slot('$active_slot')]); +} + +# Acquire one of the standby logical slots created by create_logical_slots(). +# In case wait is true we are waiting for an active pid on the 'activeslot' slot. +# If wait is not true it means we are testing a known failure scenario. +sub make_slot_active +{ + my ($node, $slot_prefix, $wait, $to_stdout, $to_stderr) = @_; + my $slot_user_handle; + + my $active_slot = $slot_prefix . 'activeslot'; + $slot_user_handle = IPC::Run::start(['pg_recvlogical', '-d', $node->connstr('testdb'), '-S', qq($active_slot), '-o', 'include-xids=0', '-o', 'skip-empty-xacts=1', '--no-loop', '--start', '-f', '-'], '>', $to_stdout, '2>', $to_stderr); + + if ($wait) + { + # make sure activeslot is in use + $node->poll_query_until('testdb', + qq[SELECT EXISTS (SELECT 1 FROM pg_replication_slots WHERE slot_name = '$active_slot' AND active_pid IS NOT NULL)] + ) or die "slot never became active"; + } + return $slot_user_handle; +} + +# Check pg_recvlogical stderr +sub check_pg_recvlogical_stderr +{ + my ($slot_user_handle, $check_stderr) = @_; + my $return; + + # our client should've terminated in response to the walsender error + $slot_user_handle->finish; + $return = $?; + cmp_ok($return, "!=", 0, "pg_recvlogical exited non-zero"); + if ($return) { + like($stderr, qr/$check_stderr/, 'slot has been invalidated'); + } + + return 0; +} + +# Check if all the slots on standby are dropped. These include the 'activeslot' +# that was acquired by make_slot_active(), and the non-active 'inactiveslot'. +sub check_slots_dropped +{ + my ($slot_prefix, $slot_user_handle) = @_; + + is($node_standby->slot($slot_prefix . 'inactiveslot')->{'slot_type'}, '', 'inactiveslot on standby dropped'); + is($node_standby->slot($slot_prefix . 'activeslot')->{'slot_type'}, '', 'activeslot on standby dropped'); + + check_pg_recvlogical_stderr($slot_user_handle, "conflict with recovery"); +} + +# Change hot_standby_feedback and check xmin and catalog_xmin values. +sub change_hot_standby_feedback_and_wait_for_xmins +{ + my ($hsf, $invalidated) = @_; + + $node_standby->append_conf('postgresql.conf',qq[ + hot_standby_feedback = $hsf + ]); + + $node_standby->reload; + + if ($hsf && $invalidated) + { + # With hot_standby_feedback on, xmin should advance, + # but catalog_xmin should still remain NULL since there is no logical slot. + wait_for_xmins($node_primary, $primary_slotname, + "xmin IS NOT NULL AND catalog_xmin IS NULL"); + } + elsif ($hsf) + { + # With hot_standby_feedback on, xmin and catalog_xmin should advance. + wait_for_xmins($node_primary, $primary_slotname, + "xmin IS NOT NULL AND catalog_xmin IS NOT NULL"); + } + else + { + # Both should be NULL since hs_feedback is off + wait_for_xmins($node_primary, $primary_slotname, + "xmin IS NULL AND catalog_xmin IS NULL"); + + } +} + +# Check conflicting status in pg_replication_slots. +sub check_slots_conflicting_status +{ + my ($conflicting) = @_; + + if ($conflicting) + { + $res = $node_standby->safe_psql( + 'postgres', qq( + select bool_and(conflicting) from pg_replication_slots;)); + + is($res, 't', + "Logical slots are reported as conflicting"); + } + else + { + $res = $node_standby->safe_psql( + 'postgres', qq( + select bool_or(conflicting) from pg_replication_slots;)); + + is($res, 'f', + "Logical slots are reported as non conflicting"); + } +} + +# Drop the slots, re-create them, change hot_standby_feedback, +# check xmin and catalog_xmin values, make slot active and reset stat. +sub reactive_slots_change_hfs_and_wait_for_xmins +{ + my ($previous_slot_prefix, $slot_prefix, $hsf, $invalidated) = @_; + + # drop the logical slots + drop_logical_slots($previous_slot_prefix); + + # create the logical slots + create_logical_slots($node_standby, $slot_prefix); + + change_hot_standby_feedback_and_wait_for_xmins($hsf, $invalidated); + + $handle = make_slot_active($node_standby, $slot_prefix, 1, \$stdout, \$stderr); + + # reset stat: easier to check for confl_active_logicalslot in pg_stat_database_conflicts + $node_standby->psql('testdb', q[select pg_stat_reset();]); +} + +# Check invalidation in the logfile and in pg_stat_database_conflicts +sub check_for_invalidation +{ + my ($slot_prefix, $log_start, $test_name) = @_; + + my $active_slot = $slot_prefix . 'activeslot'; + my $inactive_slot = $slot_prefix . 'inactiveslot'; + + # message should be issued + ok( find_in_log( + $node_standby, + "invalidating obsolete replication slot \"$inactive_slot\"", $log_start), + "inactiveslot slot invalidation is logged $test_name"); + + ok( find_in_log( + $node_standby, + "invalidating obsolete replication slot \"$active_slot\"", $log_start), + "activeslot slot invalidation is logged $test_name"); + + # Verify that pg_stat_database_conflicts.confl_active_logicalslot has been updated + ok( $node_standby->poll_query_until( + 'postgres', + "select (confl_active_logicalslot = 1) from pg_stat_database_conflicts where datname = 'testdb'", 't'), + 'confl_active_logicalslot updated') or die "Timed out waiting confl_active_logicalslot to be updated"; +} + +######################## +# Initialize primary node +######################## + +$node_primary->init(allows_streaming => 1, has_archiving => 1); +$node_primary->append_conf('postgresql.conf', q{ +wal_level = 'logical' +max_replication_slots = 4 +max_wal_senders = 4 +log_min_messages = 'debug2' +log_error_verbosity = verbose +}); +$node_primary->dump_info; +$node_primary->start; + +$node_primary->psql('postgres', q[CREATE DATABASE testdb]); + +$node_primary->safe_psql('testdb', qq[SELECT * FROM pg_create_physical_replication_slot('$primary_slotname');]); + +# Check conflicting is NULL for physical slot +$res = $node_primary->safe_psql( + 'postgres', qq[ + SELECT conflicting is null FROM pg_replication_slots where slot_name = '$primary_slotname';]); + +is($res, 't', + "Physical slot reports conflicting as NULL"); + +my $backup_name = 'b1'; +$node_primary->backup($backup_name); + +# Some tests need to wait for VACUUM to be replayed. But vacuum does not flush +# WAL. An insert into flush_wal outside transaction does guarantee a flush. +$node_primary->psql('testdb', q[CREATE TABLE flush_wal();]); + +####################### +# Initialize standby node +####################### + +$node_standby->init_from_backup( + $node_primary, $backup_name, + has_streaming => 1, + has_restoring => 1); +$node_standby->append_conf('postgresql.conf', + qq[primary_slot_name = '$primary_slotname']); +$node_standby->start; +$node_primary->wait_for_replay_catchup($node_standby); +$node_standby->safe_psql('testdb', qq[SELECT * FROM pg_create_physical_replication_slot('$standby_physical_slotname');]); + +####################### +# Initialize cascading standby node +####################### +$node_standby->backup($backup_name); +$node_cascading_standby->init_from_backup( + $node_standby, $backup_name, + has_streaming => 1, + has_restoring => 1); +$node_cascading_standby->append_conf('postgresql.conf', + qq[primary_slot_name = '$standby_physical_slotname']); +$node_cascading_standby->start; +$node_standby->wait_for_replay_catchup($node_cascading_standby, $node_primary); + +################################################## +# Test that logical decoding on the standby +# behaves correctly. +################################################## + +# create the logical slots +create_logical_slots($node_standby, 'behaves_ok_'); + +$node_primary->safe_psql('testdb', qq[CREATE TABLE decoding_test(x integer, y text);]); +$node_primary->safe_psql('testdb', qq[INSERT INTO decoding_test(x,y) SELECT s, s::text FROM generate_series(1,10) s;]); + +$node_primary->wait_for_replay_catchup($node_standby); + +my $result = $node_standby->safe_psql('testdb', + qq[SELECT pg_logical_slot_get_changes('behaves_ok_activeslot', NULL, NULL);]); + +# test if basic decoding works +is(scalar(my @foobar = split /^/m, $result), + 14, 'Decoding produced 14 rows (2 BEGIN/COMMIT and 10 rows)'); + +# Insert some rows and verify that we get the same results from pg_recvlogical +# and the SQL interface. +$node_primary->safe_psql('testdb', + qq[INSERT INTO decoding_test(x,y) SELECT s, s::text FROM generate_series(1,4) s;] +); + +my $expected = q{BEGIN +table public.decoding_test: INSERT: x[integer]:1 y[text]:'1' +table public.decoding_test: INSERT: x[integer]:2 y[text]:'2' +table public.decoding_test: INSERT: x[integer]:3 y[text]:'3' +table public.decoding_test: INSERT: x[integer]:4 y[text]:'4' +COMMIT}; + +$node_primary->wait_for_replay_catchup($node_standby); + +my $stdout_sql = $node_standby->safe_psql('testdb', + qq[SELECT data FROM pg_logical_slot_peek_changes('behaves_ok_activeslot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');] +); + +is($stdout_sql, $expected, 'got expected output from SQL decoding session'); + +my $endpos = $node_standby->safe_psql('testdb', + "SELECT lsn FROM pg_logical_slot_peek_changes('behaves_ok_activeslot', NULL, NULL) ORDER BY lsn DESC LIMIT 1;" +); + +# Insert some rows after $endpos, which we won't read. +$node_primary->safe_psql('testdb', + qq[INSERT INTO decoding_test(x,y) SELECT s, s::text FROM generate_series(5,50) s;] +); + +$node_primary->wait_for_catchup($node_standby); + +my $stdout_recv = $node_standby->pg_recvlogical_upto( + 'testdb', 'behaves_ok_activeslot', $endpos, $default_timeout, + 'include-xids' => '0', + 'skip-empty-xacts' => '1'); +chomp($stdout_recv); +is($stdout_recv, $expected, + 'got same expected output from pg_recvlogical decoding session'); + +$node_standby->poll_query_until('testdb', + "SELECT EXISTS (SELECT 1 FROM pg_replication_slots WHERE slot_name = 'behaves_ok_activeslot' AND active_pid IS NULL)" +) or die "slot never became inactive"; + +$stdout_recv = $node_standby->pg_recvlogical_upto( + 'testdb', 'behaves_ok_activeslot', $endpos, $default_timeout, + 'include-xids' => '0', + 'skip-empty-xacts' => '1'); +chomp($stdout_recv); +is($stdout_recv, '', 'pg_recvlogical acknowledged changes'); + +$node_primary->safe_psql('postgres', 'CREATE DATABASE otherdb'); + +is( $node_primary->psql( + 'otherdb', + "SELECT lsn FROM pg_logical_slot_peek_changes('behaves_ok_activeslot', NULL, NULL) ORDER BY lsn DESC LIMIT 1;" + ), + 3, + 'replaying logical slot from another database fails'); + +################################################## +# Recovery conflict: Invalidate conflicting slots, including in-use slots +# Scenario 1: hot_standby_feedback off and vacuum FULL +################################################## + +# One way to produce recovery conflict is to create/drop a relation and +# launch a vacuum full on pg_class with hot_standby_feedback turned off on +# the standby. +reactive_slots_change_hfs_and_wait_for_xmins('behaves_ok_', 'vacuum_full_', 0, 1); + +# This should trigger the conflict +$node_primary->safe_psql('testdb', qq[ + CREATE TABLE conflict_test(x integer, y text); + DROP TABLE conflict_test; + VACUUM full pg_class; + INSERT INTO flush_wal DEFAULT VALUES; -- see create table flush_wal +]); + +$node_primary->wait_for_replay_catchup($node_standby); + +# Check invalidation in the logfile and in pg_stat_database_conflicts +check_for_invalidation('vacuum_full_', 1, 'with vacuum FULL on pg_class'); + +# Verify slots are reported as conflicting in pg_replication_slots +check_slots_conflicting_status(1); + +$handle = make_slot_active($node_standby, 'vacuum_full_', 0, \$stdout, \$stderr); + +# We are not able to read from the slot as it has been invalidated +check_pg_recvlogical_stderr($handle, "can no longer get changes from replication slot \"vacuum_full_activeslot\""); + +# Turn hot_standby_feedback back on +change_hot_standby_feedback_and_wait_for_xmins(1,1); + +################################################## +# Verify that invalidated logical slots stay invalidated across a restart. +################################################## +$node_standby->restart; + +# Verify slots are reported as conflicting in pg_replication_slots +check_slots_conflicting_status(1); + +################################################## +# Verify that invalidated logical slots do not lead to retaining WAL +################################################## +# XXXXX TODO + +################################################## +# Recovery conflict: Invalidate conflicting slots, including in-use slots +# Scenario 2: conflict due to row removal with hot_standby_feedback off. +################################################## + +# get the position to search from in the standby logfile +my $logstart = -s $node_standby->logfile; + +# One way to produce recovery conflict is to create/drop a relation and +# launch a vacuum on pg_class with hot_standby_feedback turned off on the standby. +reactive_slots_change_hfs_and_wait_for_xmins('vacuum_full_', 'row_removal_', 0, 1); + +# This should trigger the conflict +$node_primary->safe_psql('testdb', qq[ + CREATE TABLE conflict_test(x integer, y text); + DROP TABLE conflict_test; + VACUUM pg_class; + INSERT INTO flush_wal DEFAULT VALUES; -- see create table flush_wal +]); + +$node_primary->wait_for_replay_catchup($node_standby); + +# Check invalidation in the logfile and in pg_stat_database_conflicts +check_for_invalidation('row_removal_', $logstart, 'with vacuum on pg_class'); + +# Verify slots are reported as conflicting in pg_replication_slots +check_slots_conflicting_status(1); + +$handle = make_slot_active($node_standby, 'row_removal_', 0, \$stdout, \$stderr); + +# We are not able to read from the slot as it has been invalidated +check_pg_recvlogical_stderr($handle, "can no longer get changes from replication slot \"row_removal_activeslot\""); + +################################################## +# Recovery conflict: Same as Scenario 2 but on a shared catalog table +# Scenario 3: conflict due to row removal with hot_standby_feedback off. +################################################## + +# get the position to search from in the standby logfile +$logstart = -s $node_standby->logfile; + +# One way to produce recovery conflict is to create/drop a relation and +# launch a vacuum on pg_class with hot_standby_feedback turned off on the standby. +reactive_slots_change_hfs_and_wait_for_xmins('row_removal_', 'shared_row_removal_', 0, 1); + +# Trigger the conflict +diag $node_primary->safe_psql('testdb', qq[ + CREATE ROLE create_trash; + DROP ROLE create_trash; + VACUUM pg_authid; + INSERT INTO flush_wal DEFAULT VALUES; -- see create table flush_wal +]); + +$node_primary->wait_for_replay_catchup($node_standby); + +# Check invalidation in the logfile and in pg_stat_database_conflicts +check_for_invalidation('shared_row_removal_', $logstart, 'with vacuum on pg_authid'); + +# Verify slots are reported as conflicting in pg_replication_slots +check_slots_conflicting_status(1); + +$handle = make_slot_active($node_standby, 'shared_row_removal_', 0, \$stdout, \$stderr); + +# We are not able to read from the slot as it has been invalidated +check_pg_recvlogical_stderr($handle, "can no longer get changes from replication slot \"shared_row_removal_activeslot\""); + +################################################## +# Recovery conflict: Same as Scenario 2 but on a non catalog table +# Scenario 4: No conflict expected. +################################################## + +# get the position to search from in the standby logfile +$logstart = -s $node_standby->logfile; + +reactive_slots_change_hfs_and_wait_for_xmins('shared_row_removal_', 'no_conflict_', 0, 1); + +# This should not trigger a conflict +$node_primary->safe_psql('testdb', qq[ + CREATE TABLE conflict_test(x integer, y text); + INSERT INTO conflict_test(x,y) SELECT s, s::text FROM generate_series(1,4) s; + UPDATE conflict_test set x=1, y=1; + VACUUM conflict_test; + INSERT INTO flush_wal DEFAULT VALUES; -- see create table flush_wal +]); +$node_primary->wait_for_replay_catchup($node_standby); + +# message should not be issued +ok( !find_in_log( + $node_standby, + "invalidating obsolete slot \"no_conflict_inactiveslot\"", $logstart), + 'inactiveslot slot invalidation is not logged with vacuum on conflict_test'); + +ok( !find_in_log( + $node_standby, + "invalidating obsolete slot \"no_conflict_activeslot\"", $logstart), + 'activeslot slot invalidation is not logged with vacuum on conflict_test'); + +# Verify that pg_stat_database_conflicts.confl_active_logicalslot has not been updated +ok( $node_standby->poll_query_until( + 'postgres', + "select (confl_active_logicalslot = 0) from pg_stat_database_conflicts where datname = 'testdb'", 't'), + 'confl_active_logicalslot not updated') or die "Timed out waiting confl_active_logicalslot to be updated"; + +# Verify slots are reported as non conflicting in pg_replication_slots +check_slots_conflicting_status(0); + +# Turn hot_standby_feedback back on +change_hot_standby_feedback_and_wait_for_xmins(1, 0); + +# Restart the standby node to ensure no slots are still active +$node_standby->restart; + +################################################## +# Recovery conflict: Invalidate conflicting slots, including in-use slots +# Scenario 4: conflict due to on-access pruning. +################################################## + +# get the position to search from in the standby logfile +$logstart = -s $node_standby->logfile; + +# One way to produce recovery conflict is to trigger an on-access pruning +# on a relation marked as user_catalog_table. +reactive_slots_change_hfs_and_wait_for_xmins('no_conflict_', 'pruning_', 0, 0); + +# This should trigger the conflict +$node_primary->safe_psql('testdb', qq[CREATE TABLE prun(id integer, s char(2000)) WITH (fillfactor = 75, user_catalog_table = true);]); +$node_primary->safe_psql('testdb', qq[INSERT INTO prun VALUES (1, 'A');]); +$node_primary->safe_psql('testdb', qq[UPDATE prun SET s = 'B';]); +$node_primary->safe_psql('testdb', qq[UPDATE prun SET s = 'C';]); +$node_primary->safe_psql('testdb', qq[UPDATE prun SET s = 'D';]); +$node_primary->safe_psql('testdb', qq[UPDATE prun SET s = 'E';]); + +$node_primary->wait_for_replay_catchup($node_standby); + +# Check invalidation in the logfile and in pg_stat_database_conflicts +check_for_invalidation('pruning_', $logstart, 'with on-access pruning'); + +# Verify slots are reported as conflicting in pg_replication_slots +check_slots_conflicting_status(1); + +$handle = make_slot_active($node_standby, 'pruning_', 0, \$stdout, \$stderr); + +# We are not able to read from the slot as it has been invalidated +check_pg_recvlogical_stderr($handle, "can no longer get changes from replication slot \"pruning_activeslot\""); + +# Turn hot_standby_feedback back on +change_hot_standby_feedback_and_wait_for_xmins(1, 1); + +################################################## +# Recovery conflict: Invalidate conflicting slots, including in-use slots +# Scenario 5: incorrect wal_level on primary. +################################################## + +# get the position to search from in the standby logfile +$logstart = -s $node_standby->logfile; + +# drop the logical slots +drop_logical_slots('pruning_'); + +# create the logical slots +create_logical_slots($node_standby, 'wal_level_'); + +$handle = make_slot_active($node_standby, 'wal_level_', 1, \$stdout, \$stderr); + +# reset stat: easier to check for confl_active_logicalslot in pg_stat_database_conflicts +$node_standby->psql('testdb', q[select pg_stat_reset();]); + +# Make primary wal_level replica. This will trigger slot conflict. +$node_primary->append_conf('postgresql.conf',q[ +wal_level = 'replica' +]); +$node_primary->restart; + +$node_primary->wait_for_replay_catchup($node_standby); + +# Check invalidation in the logfile and in pg_stat_database_conflicts +check_for_invalidation('wal_level_', $logstart, 'due to wal_level'); + +# Verify slots are reported as conflicting in pg_replication_slots +check_slots_conflicting_status(1); + +$handle = make_slot_active($node_standby, 'wal_level_', 0, \$stdout, \$stderr); +# We are not able to read from the slot as it requires wal_level at least logical on the primary server +check_pg_recvlogical_stderr($handle, "logical decoding on a standby requires wal_level to be at least logical on the primary"); + +# Restore primary wal_level +$node_primary->append_conf('postgresql.conf',q[ +wal_level = 'logical' +]); +$node_primary->restart; +$node_primary->wait_for_replay_catchup($node_standby); + +$handle = make_slot_active($node_standby, 'wal_level_', 0, \$stdout, \$stderr); +# as the slot has been invalidated we should not be able to read +check_pg_recvlogical_stderr($handle, "can no longer get changes from replication slot \"wal_level_activeslot\""); + +################################################## +# DROP DATABASE should drops it's slots, including active slots. +################################################## + +# drop the logical slots +drop_logical_slots('wal_level_'); + +# create the logical slots +create_logical_slots($node_standby, 'drop_db_'); + +$handle = make_slot_active($node_standby, 'drop_db_', 1, \$stdout, \$stderr); + +# Create a slot on a database that would not be dropped. This slot should not +# get dropped. +$node_standby->create_logical_slot_on_standby($node_primary, 'otherslot', 'postgres'); + +# dropdb on the primary to verify slots are dropped on standby +$node_primary->safe_psql('postgres', q[DROP DATABASE testdb]); + +$node_primary->wait_for_replay_catchup($node_standby); + +is($node_standby->safe_psql('postgres', + q[SELECT EXISTS(SELECT 1 FROM pg_database WHERE datname = 'testdb')]), 'f', + 'database dropped on standby'); + +check_slots_dropped('drop_db', $handle); + +is($node_standby->slot('otherslot')->{'slot_type'}, 'logical', + 'otherslot on standby not dropped'); + +# Cleanup : manually drop the slot that was not dropped. +$node_standby->psql('postgres', q[SELECT pg_drop_replication_slot('otherslot')]); + +################################################## +# Test standby promotion and logical decoding behavior +# after the standby gets promoted. +################################################## + +$node_standby->reload; + +$node_primary->psql('postgres', q[CREATE DATABASE testdb]); +$node_primary->safe_psql('testdb', qq[CREATE TABLE decoding_test(x integer, y text);]); + +# create the logical slots +create_logical_slots($node_standby, 'promotion_'); + +# create the logical slots on the cascading standby too +create_logical_slots($node_cascading_standby, 'promotion_'); + +# Make slots actives +$handle = make_slot_active($node_standby, 'promotion_', 1, \$stdout, \$stderr); +my $cascading_handle = make_slot_active($node_cascading_standby, 'promotion_', 1, \$cascading_stdout, \$cascading_stderr); + +# Insert some rows before the promotion +$node_primary->safe_psql('testdb', + qq[INSERT INTO decoding_test(x,y) SELECT s, s::text FROM generate_series(1,4) s;] +); + +# Wait for both standbys to catchup +$node_primary->wait_for_replay_catchup($node_standby); +$node_standby->wait_for_replay_catchup($node_cascading_standby, $node_primary); + +# promote +$node_standby->promote; + +# insert some rows on promoted standby +$node_standby->safe_psql('testdb', + qq[INSERT INTO decoding_test(x,y) SELECT s, s::text FROM generate_series(5,7) s;] +); + +# Wait for the cascading standby to catchup +$node_standby->wait_for_replay_catchup($node_cascading_standby); + +$expected = q{BEGIN +table public.decoding_test: INSERT: x[integer]:1 y[text]:'1' +table public.decoding_test: INSERT: x[integer]:2 y[text]:'2' +table public.decoding_test: INSERT: x[integer]:3 y[text]:'3' +table public.decoding_test: INSERT: x[integer]:4 y[text]:'4' +COMMIT +BEGIN +table public.decoding_test: INSERT: x[integer]:5 y[text]:'5' +table public.decoding_test: INSERT: x[integer]:6 y[text]:'6' +table public.decoding_test: INSERT: x[integer]:7 y[text]:'7' +COMMIT}; + +# check that we are decoding pre and post promotion inserted rows +$stdout_sql = $node_standby->safe_psql('testdb', + qq[SELECT data FROM pg_logical_slot_peek_changes('promotion_inactiveslot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');] +); + +is($stdout_sql, $expected, 'got expected output from SQL decoding session on promoted standby'); + +# check that we are decoding pre and post promotion inserted rows +# with pg_recvlogical that has started before the promotion +my $pump_timeout = IPC::Run::timer($PostgreSQL::Test::Utils::timeout_default); + +ok( pump_until( + $handle, $pump_timeout, \$stdout, qr/^.*COMMIT.*COMMIT$/s), + 'got 2 COMMIT from pg_recvlogical output'); + +chomp($stdout); +is($stdout, $expected, + 'got same expected output from pg_recvlogical decoding session'); + +# check that we are decoding pre and post promotion inserted rows on the cascading standby +$stdout_sql = $node_cascading_standby->safe_psql('testdb', + qq[SELECT data FROM pg_logical_slot_peek_changes('promotion_inactiveslot', NULL, NULL, 'include-xids', '0', 'skip-empty-xacts', '1');] +); + +is($stdout_sql, $expected, 'got expected output from SQL decoding session on cascading standby'); + +# check that we are decoding pre and post promotion inserted rows +# with pg_recvlogical that has started before the promotion on the cascading standby +ok( pump_until( + $cascading_handle, $pump_timeout, \$cascading_stdout, qr/^.*COMMIT.*COMMIT$/s), + 'got 2 COMMIT from pg_recvlogical output'); + +chomp($cascading_stdout); +is($cascading_stdout, $expected, + 'got same expected output from pg_recvlogical decoding session on cascading standby'); + +done_testing();