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#
# Ensure that when the slave restarts, the last error code displayed by
# SHOW SLAVE STATUS is cleared before Slave_SQL_Running is set.
#
# To ensure that, this test uses the debug_sync mechanism to pause an errored
# and restarting slave's SQL thread after it has set its running state to YES,
# and then ensures that Last_SQL_Errno is 0. The slave error is a forced innodb
# row lock timeout.
#
#
# References
# MDEV-31177: SHOW SLAVE STATUS Last_SQL_Errno Race Condition on Errored
# Slave Restart
#
source include/have_binlog_format_row.inc;
source include/have_innodb.inc;
source include/have_debug.inc;
source include/have_debug_sync.inc;
source include/master-slave.inc;
--connection master
create table t1 (a int primary key, b int) engine=innodb;
insert t1 values (1,1);
--source include/save_master_gtid.inc
--connection slave
--source include/sync_with_master_gtid.inc
--source include/stop_slave.inc
set @save_innodb_lock_wait_timeout= @@global.innodb_lock_wait_timeout;
set @save_slave_trans_retries= @@global.slave_transaction_retries;
set @@global.innodb_lock_wait_timeout= 1;
set @@global.slave_transaction_retries= 0;
--connection master
update t1 set b=b+10 where a=1;
--source include/save_master_gtid.inc
--connection slave1
BEGIN;
--eval SELECT * FROM t1 WHERE a=1 FOR UPDATE
--connection slave
--source include/start_slave.inc
--let $slave_sql_errno= 1205
--source include/wait_for_slave_sql_error.inc
--connection slave1
ROLLBACK;
--connection slave
set @save_dbug = @@global.debug_dbug;
set @@global.debug_dbug= "+d,delay_sql_thread_after_release_run_lock";
--source include/start_slave.inc
set debug_sync= "now wait_for sql_thread_run_lock_released";
--let $sql_running = query_get_value("SHOW SLAVE STATUS", Slave_SQL_Running, 1)
--echo # Validating that the SQL thread is running..
if (`SELECT strcmp("$sql_running", "YES") != 0`)
{
--echo # ..failed
--echo # Slave_SQL_Running: $sql_running
--die Slave SQL thread is not running
}
--echo # ..success
--let $last_error = query_get_value("SHOW SLAVE STATUS", Last_SQL_Errno, 1)
--echo # Validating that Last_SQL_Errno is cleared..
if ($last_error)
{
--echo # ..failed
--echo # Last_SQL_Errno: $last_error
--die SHOW SLAVE STATUS shows the error from the last session on startup
}
--echo # ..success
set debug_sync= "now signal sql_thread_continue";
--echo # Wait for debug_sync signal to have been received before issuing RESET
let $wait_condition= select count(*)=0 from information_schema.processlist where state like "debug sync point%";
source include/wait_condition.inc;
set @@global.debug_dbug= @saved_dbug;
set debug_sync= "RESET";
--echo # Cleanup
--connection master
drop table t1;
--connection slave
--source include/stop_slave.inc
set @@global.innodb_lock_wait_timeout= @save_innodb_lock_wait_timeout;
set @@global.slave_transaction_retries= @save_slave_trans_retries;
--source include/start_slave.inc
--source include/rpl_end.inc
--echo # End of rpl_sql_thd_start_errno_cleared.test
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