mariadb/mysql-test/suite/galera/t/galera_slave_replay.test

#
# This test tests the operation of transaction replay for async replication slave.
# If a potentially conflicting galera transaction arrives at
# just the right time during the commit and has lock conflict with async replication transaction
# applied by slave SQL thread, then the async replication transaction should either abort
# or rollback and replay (depending on the nature of lock conflict).
#

--source include/have_innodb.inc
--source include/have_log_bin.inc
--source include/have_debug.inc
--source include/have_debug_sync.inc
--source include/galera_have_debug_sync.inc

--connect node_2a, 127.0.0.1, root, , test, $NODE_MYPORT_2

--connection node_2a
--source include/galera_cluster.inc

ALTER TABLE mysql.gtid_slave_pos ENGINE=InnoDB;

#
# node 3 is native MariaDB server operating as async replication master
#
--connect node_3, 127.0.0.1, root, , test, $NODE_MYPORT_3
--connection node_3
RESET MASTER;

--connection node_2a
#
# count the number of wsrep replay's done in the node
#
--let $wsrep_local_replays_old = `SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_local_replays'`


#
# nodes 1 and 2 form a galera cluster, node 2 operates as slave for native MariaDB master in node 3
#
--disable_query_log
--eval CHANGE MASTER TO MASTER_HOST='127.0.0.1', MASTER_USER='root', MASTER_PORT=$NODE_MYPORT_3;
--enable_query_log
START SLAVE;

--connection node_3
CREATE TABLE t1 (f1 INTEGER PRIMARY KEY, f2 CHAR(1)) engine=innodb;
INSERT INTO t1 VALUES (1, 'a');
INSERT INTO t1 VALUES (3, 'a');

#
# use statement format replication to cause a false positive conflict with async replication transaction
# and galera replication. The conflict will be on GAP lock, and slave SQL thread should rollback
# and replay
#
set binlog_format=STATEMENT;

SET AUTOCOMMIT=ON;
START TRANSACTION;

SELECT * FROM t1  FOR UPDATE;
UPDATE t1 SET f2 = 'c' WHERE f1 > 1;

--connection node_2a
# wait for create table and inserts to be replicated from master
SET SESSION wsrep_sync_wait = 0;
--let $wait_condition = SELECT COUNT(*) = 2 FROM test.t1;
--source include/wait_condition.inc

# wait for create table and inserts to be replicated in cluster
--connection node_1
SET SESSION wsrep_sync_wait = 0;
--let $wait_condition = SELECT COUNT(*) = 2 FROM test.t1;
--source include/wait_condition.inc

--connection node_2a
# Block the future commit of async replication
--let $galera_sync_point = commit_monitor_master_enter_sync
--source include/galera_set_sync_point.inc

# block also the applier before applying begins
SET GLOBAL debug_dbug = "d,sync.wsrep_apply_cb";

#
# now inject a conflicting insert from node 1, it will replicate with
# earlier seqno (than async transaction) and pause before applying in node 2
#
--connection node_1
INSERT INTO test.t1 VALUES (2, 'b');

#
# send the update from master, this will succeed here, beceuase of async replication.
# async replication will apply this in node 2 and pause before commit phase,
--connection node_3
--error 0
COMMIT;

# Wait until async slave commit is blocked in node_2
--connection node_2a
--source include/galera_wait_sync_point.inc

#
# release the applier
# note: have to clear wsrep_apply_cb sync point first, as async replication will go for replay
# and as this sync point, after BF applier is released to progress
#
SET GLOBAL debug_dbug = "";
SET DEBUG_SYNC = "now SIGNAL signal.wsrep_apply_cb";

# Unblock the async slave commit
--connection node_2a
--source include/galera_clear_sync_point.inc
--source include/galera_signal_sync_point.inc

--connection node_3

SELECT COUNT(*) = 1 FROM t1 WHERE f2 = 'a';
SELECT COUNT(*) = 1 FROM t1 WHERE f2 = 'c';
SELECT * FROM t1;

--connection node_2a

# wsrep_local_replays has increased by 1
set session wsrep_sync_wait=15;
--let $wsrep_local_replays_new = `SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_local_replays'`
set session wsrep_sync_wait=0;

--disable_query_log
--eval SELECT $wsrep_local_replays_new - $wsrep_local_replays_old = 1 AS wsrep_local_replays;
--enable_query_log

#
#  replaying of async transaction should be effective, and row 3 having 'c' in f2
#
SELECT *  FROM t1;
SET DEBUG_SYNC = "RESET";

#********************************************************************************
#	test phase 2
#********************************************************************************

--echo #
--echo # test phase with real abort
--echo #

--connection node_3

set binlog_format=ROW;

insert into t1 values (4, 'd');

SET AUTOCOMMIT=ON;
START TRANSACTION;

UPDATE t1 SET f2 = 'd' WHERE f1 = 3;

--connection node_2a
# wait for the last insert to be replicated from master
--let $wait_condition = SELECT COUNT(*) = 4 FROM test.t1;
--source include/wait_condition.inc

# block applier
SET GLOBAL debug_dbug = "d,sync.wsrep_apply_cb";

# Inject a conflicting update from node 1
--connection node_1
UPDATE test.t1 SET f2 = 'e' WHERE f1 = 3;

--connection node_2a
# wait until applier has reached the sync point
SET SESSION DEBUG_SYNC = "now WAIT_FOR sync.wsrep_apply_cb_reached";
--let $expected_cert_failures = `SELECT VARIABLE_VALUE+1 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_local_cert_failures'`

# send the update from master
--connection node_3
--error 0
COMMIT;

--connection node_2a
--let $wait_condition = SELECT VARIABLE_VALUE = $expected_cert_failures FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_local_cert_failures'
--source include/wait_condition.inc

# release the applier from node 1
SET GLOBAL debug_dbug = "";
SET DEBUG_SYNC = "now SIGNAL signal.wsrep_apply_cb";

--connection node_2a

set session wsrep_sync_wait=15;
SELECT COUNT(*) = 1 FROM test.t1 WHERE f2 = 'e';
set session wsrep_sync_wait=0;

STOP SLAVE;
RESET SLAVE;
SET DEBUG_SYNC = "RESET";

DROP TABLE t1;

--connection node_3
DROP TABLE t1;
RESET MASTER;