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7e0c9de864
When a deadlock kill is detected inside the storage engine, the kill is not done immediately, to avoid calling back into the storage engine kill_query method with various lock subsystem mutexes held. Instead the kill is queued and done later by a slave background thread. This patch in preparation for fixing TokuDB optimistic parallel replication, as well as for removing locking hacks in InnoDB/XtraDB in 10.2. Signed-off-by: Kristian Nielsen <knielsen at knielsen-hq.org>
119 lines
3.7 KiB
Text
119 lines
3.7 KiB
Text
SET GLOBAL event_scheduler = OFF;
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SELECT name, type, processlist_user, processlist_host, processlist_db,
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processlist_command, processlist_info,
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IF(parent_thread_id IS NULL, parent_thread_id, 'unified parent_thread_id')
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AS unified_parent_thread_id,
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role, instrumented
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FROM performance_schema.threads
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WHERE name LIKE 'thread/sql%'
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ORDER BY name;
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name thread/sql/main
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type BACKGROUND
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processlist_user NULL
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processlist_host NULL
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processlist_db NULL
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processlist_command NULL
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processlist_info NULL
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unified_parent_thread_id NULL
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role NULL
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instrumented YES
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name thread/sql/one_connection
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type FOREGROUND
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processlist_user root
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processlist_host localhost
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processlist_db test
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processlist_command Query
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processlist_info SELECT name, type, processlist_user, processlist_host, processlist_db,
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processlist_command, processlist_info,
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IF(parent_thread_id IS NULL, parent_thread_id, 'unified parent_thread_id')
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AS unified_parent_thread_id,
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role, instrumented
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FROM performance_schema.threads
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WHERE name LIKE 'thread/sql%'
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ORDER BY name
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unified_parent_thread_id unified parent_thread_id
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role NULL
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instrumented YES
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name thread/sql/signal_handler
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type BACKGROUND
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processlist_user NULL
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processlist_host NULL
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processlist_db NULL
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processlist_command NULL
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processlist_info NULL
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unified_parent_thread_id unified parent_thread_id
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role NULL
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instrumented YES
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name thread/sql/slave_background
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type BACKGROUND
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processlist_user NULL
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processlist_host NULL
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processlist_db NULL
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processlist_command NULL
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processlist_info NULL
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unified_parent_thread_id unified parent_thread_id
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role NULL
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instrumented YES
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CREATE TEMPORARY TABLE t1 AS
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SELECT thread_id FROM performance_schema.threads
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WHERE name LIKE 'thread/sql%';
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SET GLOBAL event_scheduler = ON;
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SELECT name, type, processlist_user, processlist_host, processlist_db,
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processlist_command, processlist_info,
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IF(parent_thread_id IS NULL, parent_thread_id, 'unified parent_thread_id')
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AS unified_parent_thread_id,
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role, instrumented
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FROM performance_schema.threads
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WHERE name LIKE 'thread/sql%'
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AND thread_id NOT IN (SELECT thread_id FROM t1)
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ORDER BY name;
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name thread/sql/event_scheduler
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type FOREGROUND
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processlist_user root
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processlist_host localhost
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processlist_db NULL
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processlist_command Sleep
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processlist_info NULL
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unified_parent_thread_id unified parent_thread_id
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role NULL
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instrumented YES
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TRUNCATE t1;
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INSERT INTO t1
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SELECT thread_id FROM performance_schema.threads
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WHERE name LIKE 'thread/sql%';
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SELECT COUNT(*) INTO @aux FROM t1;
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DROP EVENT IF EXISTS t_ps_event;
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CREATE EVENT t_ps_event
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ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 1 SECOND
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DO SELECT SLEEP(3);
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SELECT name, type, processlist_user, processlist_host, processlist_db,
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processlist_command, processlist_info,
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IF(parent_thread_id IS NULL, parent_thread_id, 'unified parent_thread_id')
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AS unified_parent_thread_id,
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role, instrumented
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FROM performance_schema.threads
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WHERE name LIKE 'thread/sql%'
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AND thread_id NOT IN (SELECT thread_id FROM t1)
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ORDER BY name;
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name thread/sql/event_worker
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type FOREGROUND
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processlist_user root
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processlist_host localhost
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processlist_db NULL
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processlist_command Sleep
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processlist_info SELECT SLEEP(3)
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unified_parent_thread_id unified parent_thread_id
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role NULL
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instrumented YES
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SELECT t2.name AS parent_thread_name, t1.name AS child_thread_name
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FROM performance_schema.threads t1 INNER JOIN performance_schema.threads t2
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ON t1.parent_thread_id = t2.thread_id
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WHERE t1.name LIKE 'thread/sql%'
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AND t1.parent_thread_id IS NOT NULL
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ORDER BY parent_thread_name, child_thread_name;
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parent_thread_name child_thread_name
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thread/sql/event_scheduler thread/sql/event_worker
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thread/sql/main thread/sql/one_connection
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thread/sql/main thread/sql/signal_handler
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thread/sql/main thread/sql/slave_background
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thread/sql/one_connection thread/sql/event_scheduler
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