Using mariadb-10.0.9-linux-x86_64.tar.gz.
MariaDB [test]> show global status like 'com_insert';
|
+---------------+--------+
|
| Variable_name | Value |
|
+---------------+--------+
|
| Com_insert | 646298 |
|
+---------------+--------+
|
1 row in set (0.00 sec)
|
|
MariaDB [test]> stop slave;
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Query OK, 0 rows affected (0.00 sec)
|
|
MariaDB [test]> show global status like 'com_insert';
|
+---------------+-------+
|
| Variable_name | Value |
|
+---------------+-------+
|
| Com_insert | 0 |
|
+---------------+-------+
|
1 row in set (0.00 sec)
|
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The problem was introduced in 5.5 tree by the following revision:
revno: 3601
revision-id: wlad@montyprogram.com-20121220231237-0xv7egt3s225bx7j
parent: timour@askmonty.org-20121220203840-ofoavsm70g8ouk0m
committer: Vladislav Vaintroub <wlad@montyprogram.com>
branch nick: 5.5
timestamp: Fri 2012-12-21 00:12:37 +0100
message:
MDEV-3945 - do not hold LOCK_thread_count when freeing THD.
The patch decreases the duration of LOCK_thread_count, so it is not hold during THD destructor and freeing memory.
This mutex now only protects the integrity of threads list, when removing THD from it, and thread_count variable.
The add_to_status() function that updates global status during client disconnect, is now correctly protected by the LOCK_status mutex.
Benchmark : in a "non-persistent" sysbench test (oltp_ro with reconnect after each query), ~ 25% more connects/disconnects were measured
I agree that the effect is bad and must be fixed, but given that it had survived for over an year without affecting anybody heavily enough to be noticed, I demote it from Blocker