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# # This test tests the operation of transaction replay. If a potentially # conflicting remote transaction arrives at just the right time during # the commit of a local transaction, the local transaction will be aborted # and replayed. # # Because the write set with higher sequence number cannot BF abort # the victim with lower sequence number, the conflicting remote transaction # must be executed first and must be allowed to proceed up to the apply # monitor before sending the COMMIT for the transaction to be replayed. # --source include/galera_cluster.inc --source include/have_innodb.inc --source include/have_debug_sync.inc --source include/galera_have_debug_sync.inc ###################################################################### # # Scenario #1, the victim will have higher seqno and will be replayed # ###################################################################### --let $wsrep_local_replays_old = `SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_local_replays'` CREATE TABLE t1 (f1 INTEGER PRIMARY KEY, f2 CHAR(1)); INSERT INTO t1 VALUES (1, 'a'); INSERT INTO t1 VALUES (2, 'a'); --connection node_1 SET AUTOCOMMIT=ON; START TRANSACTION; UPDATE t1 SET f2 = 'b' WHERE f1 = 1; SELECT * FROM t1 WHERE f1 = 2 FOR UPDATE; # Block the applier on node #1 and issue a conflicting update on node #2 --connect node_1a, 127.0.0.1, root, , test, $NODE_MYPORT_1 SET SESSION wsrep_sync_wait=0; --let $galera_sync_point = apply_monitor_slave_enter_sync --source include/galera_set_sync_point.inc --connection node_2 UPDATE t1 SET f2 = 'c' WHERE f1 = 2; --connection node_1a --source include/galera_wait_sync_point.inc --source include/galera_clear_sync_point.inc # Block the commit, send the COMMIT and wait until it gets blocked --let $galera_sync_point = commit_monitor_master_enter_sync --source include/galera_set_sync_point.inc --connection node_1 --send COMMIT --connection node_1a --let $galera_sync_point = apply_monitor_slave_enter_sync commit_monitor_master_enter_sync --source include/galera_wait_sync_point.inc --source include/galera_clear_sync_point.inc # Let the conflicting UPDATE proceed and wait until it hits abort_trx_end. # The victim transaction still sits in commit_monitor_master_sync_point. --let $galera_sync_point = abort_trx_end --source include/galera_set_sync_point.inc --let $galera_sync_point = apply_monitor_slave_enter_sync --source include/galera_signal_sync_point.inc --let $galera_sync_point = abort_trx_end commit_monitor_master_enter_sync --source include/galera_wait_sync_point.inc # Let the transactions proceed --source include/galera_clear_sync_point.inc --let $galera_sync_point = abort_trx_end --source include/galera_signal_sync_point.inc --let $galera_sync_point = commit_monitor_master_enter_sync --source include/galera_signal_sync_point.inc # Commit succeeds --connection node_1 --reap SELECT COUNT(*) = 1 FROM t1 WHERE f2 = 'b'; SELECT COUNT(*) = 1 FROM t1 WHERE f2 = 'c'; # wsrep_local_replays has increased by 1 --let $wsrep_local_replays_new = `SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_local_replays'` --disable_query_log --eval SELECT $wsrep_local_replays_new - $wsrep_local_replays_old = 1 AS wsrep_local_replays; --enable_query_log --connection node_2 SELECT COUNT(*) = 1 FROM t1 WHERE f2 = 'b'; SELECT COUNT(*) = 1 FROM t1 WHERE f2 = 'c'; DROP TABLE t1; ######################################################################### # # Scenario #2, the victim will have lower seqno and will not be replayed # ######################################################################### --connection node_1 --let $wsrep_local_replays_old = `SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_local_replays'` CREATE TABLE t1 (f1 INTEGER PRIMARY KEY, f2 CHAR(1)); INSERT INTO t1 VALUES (1, 'a'); INSERT INTO t1 VALUES (2, 'a'); --connection node_1 SET AUTOCOMMIT=ON; START TRANSACTION; UPDATE t1 SET f2 = 'b' WHERE f1 = 1; SELECT * FROM t1 WHERE f1 = 2 FOR UPDATE; # Block the commit, send the COMMIT and wait until it gets blocked --let $galera_sync_point = commit_monitor_master_enter_sync --source include/galera_set_sync_point.inc --connection node_1 --send COMMIT --connection node_1a --let $galera_sync_point = commit_monitor_master_enter_sync --source include/galera_wait_sync_point.inc --source include/galera_clear_sync_point.inc # Set sync point at the end of BF abort, issue a conflicting update # and wait for the conflicting update to hit the sync point. --let $galera_sync_point = abort_trx_end --source include/galera_set_sync_point.inc --connection node_2 UPDATE t1 SET f2 = 'c' WHERE f1 = 2; --connection node_1a --let $galera_sync_point = abort_trx_end commit_monitor_master_enter_sync --source include/galera_wait_sync_point.inc --source include/galera_clear_sync_point.inc # Let the transactions proceed --source include/galera_clear_sync_point.inc --let $galera_sync_point = abort_trx_end --source include/galera_signal_sync_point.inc --let $galera_sync_point = commit_monitor_master_enter_sync --source include/galera_signal_sync_point.inc # Commit succeeds --connection node_1 --reap SELECT COUNT(*) = 1 FROM t1 WHERE f2 = 'b'; SELECT COUNT(*) = 1 FROM t1 WHERE f2 = 'c'; # wsrep_local_replays should have not increased --let $wsrep_local_replays_new = `SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_local_replays'` --disable_query_log --eval SELECT $wsrep_local_replays_new - $wsrep_local_replays_old = 0 AS wsrep_local_replays; --enable_query_log --connection node_2 SELECT COUNT(*) = 1 FROM t1 WHERE f2 = 'b'; SELECT COUNT(*) = 1 FROM t1 WHERE f2 = 'c'; DROP TABLE t1; ######################################## # # test replaying of prepared statements # ######################################## --connection node_1 --let $wsrep_local_replays_old = `SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_local_replays'` CREATE TABLE t1 (i int primary key, j int) ENGINE=INNODB; INSERT INTO t1 VALUES (1, 0), (3, 0); SELECT * FROM t1; SET AUTOCOMMIT=ON; PREPARE stmt1 FROM "UPDATE t1 SET j = 1 where i > 0"; # Block the applier on node #1 and issue a conflicting update on node #2 --connection node_1a SET SESSION wsrep_sync_wait=0; --let $galera_sync_point = apply_monitor_slave_enter_sync --source include/galera_set_sync_point.inc --connection node_2 INSERT INTO t1 VALUES(2,2); --connection node_1a --source include/galera_wait_sync_point.inc --source include/galera_clear_sync_point.inc # Block the commit, send the EXECUTE stmt1 and wait until it gets blocked --let $galera_sync_point = commit_monitor_master_enter_sync --source include/galera_set_sync_point.inc --connection node_1 SET SESSION wsrep_sync_wait=0; --send EXECUTE stmt1 --connection node_1a --let $galera_sync_point = apply_monitor_slave_enter_sync commit_monitor_master_enter_sync --source include/galera_wait_sync_point.inc --source include/galera_clear_sync_point.inc # Let the conflicting INSERT proceed and wait until it hits abort_trx_end. # The victim transaction still sits in commit_monitor_master_sync_point. --let $galera_sync_point = abort_trx_end --source include/galera_set_sync_point.inc --let $galera_sync_point = apply_monitor_slave_enter_sync --source include/galera_signal_sync_point.inc --let $galera_sync_point = abort_trx_end commit_monitor_master_enter_sync --source include/galera_wait_sync_point.inc # Let the transactions proceed --source include/galera_clear_sync_point.inc --let $galera_sync_point = abort_trx_end --source include/galera_signal_sync_point.inc --let $galera_sync_point = commit_monitor_master_enter_sync --source include/galera_signal_sync_point.inc # Commit succeeds --connection node_1 --reap SET SESSION wsrep_sync_wait=7; SELECT * FROM t1; --connection node_2 SELECT * FROM t1; --connection node_1 # wsrep_local_replays has increased by 1 --let $wsrep_local_replays_new = `SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_local_replays'` --disable_query_log --eval SELECT $wsrep_local_replays_new - $wsrep_local_replays_old = 1 AS wsrep_local_replays; --enable_query_log DEALLOCATE PREPARE stmt1; DROP TABLE t1;