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# === Purpose === # # This test verifies that SQL and IO threads update the # rli->relay_log_space_total variable in a synchronized manner. # # === Implementation === # # 1. On Slave, make the SQL thread to purge relay logs and halt # the SQL thread in MYSQL_BIN_LOG::purge_index_entry function # using debug sync utility. # 2. Do a DML on master so that IO thread calls queue_event and # updates rli->relay_log_space_total. # 3. Verify that IO thread is waiting rli->log_space_lock until it is released # by SQL thread. # # === References === # # Bug#26997096 RELAY_LOG_SPACE IS INACCURATE AND LEAKS # This test case is binlog_format agnostic --source include/have_binlog_format_row.inc # This test case uses debug_sync --source include/have_debug.inc --source include/have_debug_sync.inc --source include/master-slave.inc CREATE TABLE t1 (i INT); --source include/sync_slave_sql_with_master.inc --source include/stop_slave_sql.inc SET GLOBAL debug='+d,wait_in_purge_index_entry'; # Create a new relay log so the START SLAVE SQL_THREAD tries # to purge the old relay logs and hits the debug point. FLUSH LOCAL RELAY LOGS; START SLAVE SQL_THREAD; SET DEBUG_SYNC="now WAIT_FOR in_purge_index_entry"; # Do a DML on master so that IO thread calls queue_event and # updates rli->relay_log_space_total. --source include/rpl_connection_master.inc INSERT INTO t1 VALUES (1); --source include/rpl_connection_slave.inc # Wait until IO thread tries to take a log_space_lock. --let $io_thread_id = `SELECT THREAD_ID FROM performance_schema.threads WHERE NAME like '%slave_io%'` --let $wait_condition= SELECT EVENT_NAME= 'wait/synch/mutex/sql/Relay_log_info::log_space_lock' FROM performance_schema.events_waits_current WHERE THREAD_ID=$io_thread_id --source include/wait_condition.inc # Since SQL thread has taken the rli->log_space_lock, IO thread should wait until # the lock is released. Assert that IO thread is waiting for rli->log_space_lock. --let $assert_text= IO Thread is waiting for Relay_log_info::log_space_lock. --let $assert_cond= "[SELECT EVENT_NAME FROM performance_schema.events_waits_current WHERE THREAD_ID=$io_thread_id]" = "wait/synch/mutex/sql/Relay_log_info::log_space_lock" --source include/assert.inc SET DEBUG_SYNC="now SIGNAL go_ahead_sql"; # Cleanup --source include/rpl_connection_master.inc DROP TABLE t1; --source include/sync_slave_sql_with_master.inc SET GLOBAL debug='-d,wait_in_purge_index_entry'; SET DEBUG_SYNC="RESET"; --source include/rpl_end.inc