72 lines
2.6 KiB
Plaintext
72 lines
2.6 KiB
Plaintext
###############################################################################
|
|
# Bug#19843808: DEADLOCK ON FLUSH TABLES WITH READ LOCK + SHOW
|
|
# SLAVE STATUS
|
|
#
|
|
# Problem:
|
|
# ========
|
|
# If a client thread on an slave does FLUSH TABLES WITH READ
|
|
# LOCK; then master does some updates, SHOW SLAVE STATUS in
|
|
# the same client will be blocked.
|
|
#
|
|
# Test:
|
|
# =====
|
|
# Execute a DML on master and make it blocked on slave after entering commit.
|
|
# Execute FLUSH TABLES WITH READ LOCK on slave. Allow the blocked DML to
|
|
# continue. The sql thread will be blocked in a state where it has acquired
|
|
# rli->data_lock and it is waiting for MDL COMMIT lock. Now execute show slave
|
|
# status command from the same client where FLUSH TABLES WITH READ LOCK was
|
|
# issued. The show slave status command should not be blocked.
|
|
###############################################################################
|
|
--source include/have_binlog_format_mixed.inc
|
|
--source include/master-slave.inc
|
|
--source include/have_debug.inc
|
|
--source include/have_debug_sync.inc
|
|
|
|
--echo # Let master and slave synced with t1 table created
|
|
CREATE TABLE t1 (f INT) ENGINE= INNODB;
|
|
--source include/sync_slave_sql_with_master.inc
|
|
|
|
--echo # Setup GLOBAL.DEBUG at slave to reach commit
|
|
--source include/rpl_connection_slave.inc
|
|
--let $debug_saved= `SELECT @@GLOBAL.DEBUG`
|
|
SET @@GLOBAL.DEBUG= '+d,dbug.reached_commit';
|
|
|
|
--echo # Do some DML operation on master so that it will be blocked on
|
|
--echo # slave as global read lock is in place.
|
|
--source include/rpl_connection_master.inc
|
|
INSERT INTO t1 VALUES (10);
|
|
|
|
--echo # Issue FLUSH TABLES WITH READ LOCK after Reached is signaled
|
|
--source include/rpl_connection_slave.inc
|
|
SET DEBUG_SYNC='now WAIT_FOR Reached';
|
|
FLUSH TABLES WITH READ LOCK;
|
|
--echo # Let sql thread continue to try to obtain commit lock
|
|
SET DEBUG_SYNC= 'now SIGNAL signal.commit_continue';
|
|
|
|
--echo # Wait until sql thread enters "Waiting for commit lock" state
|
|
let $wait_condition= SELECT COUNT(*) = 1 FROM information_schema.processlist
|
|
WHERE state = "Waiting for commit lock";
|
|
--source include/wait_condition.inc
|
|
|
|
--source include/rpl_connection_slave.inc
|
|
--disable_result_log
|
|
query_vertical SHOW SLAVE STATUS;
|
|
--enable_result_log
|
|
UNLOCK TABLES;
|
|
SET @@GLOBAL.DEBUG= '$debug_saved';
|
|
|
|
--echo # Restart SQL thread so that it notices debug has changed
|
|
--source include/restart_slave_sql.inc
|
|
|
|
--source include/rpl_connection_master.inc
|
|
--source include/sync_slave_sql_with_master.inc
|
|
|
|
let $diff_tables= master:t1, slave:t1;
|
|
source include/diff_tables.inc;
|
|
|
|
--source include/rpl_connection_master.inc
|
|
DROP TABLE t1;
|
|
--source include/sync_slave_sql_with_master.inc
|
|
|
|
--source include/rpl_end.inc
|