Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Duplicate
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11.2
Description
Example testcase:
# mysqld options required for replay: --log_bin |
SET GLOBAL innodb_flush_log_at_timeout=300; |
CREATE TABLE t (c INT) ENGINE=InnoDB; |
SELECT SLEEP(2); |
RESET MASTER;
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Various issues observed:
1. When the testcase is executed in the CLI , itwill lead to a temporary client hang:
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11.2.6 a8517608894f43954e210035d357400b3d637195 (Debug) |
11.2.6-dbg>SET GLOBAL innodb_flush_log_at_timeout=300;
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Query OK, 0 rows affected (0.000 sec)
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11.2.6-dbg>CREATE TABLE t (c INT) ENGINE=InnoDB;
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Query OK, 0 rows affected (0.008 sec)
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11.2.6-dbg>SELECT SLEEP(2);
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+----------+
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| SLEEP(2) |
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+----------+
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| 0 |
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+----------+
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1 row in set (2.000 sec)
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11.2.6-dbg>RESET MASTER;
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Query OK, 0 rows affected (4 min 57.568 sec)
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The RESET MASTER should execute immediately. The few seconds difference is likely due to the SLEEP vs flushing delay.
2. When the SLEEP is removed, the exec is immediate:
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11.2.6 a8517608894f43954e210035d357400b3d637195 (Debug) |
11.2.6-dbg>SET GLOBAL innodb_flush_log_at_timeout=300;
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Query OK, 0 rows affected (0.000 sec)
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11.2.6-dbg>CREATE TABLE t (c INT) ENGINE=InnoDB;
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Query OK, 0 rows affected (0.007 sec)
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11.2.6-dbg>RESET MASTER;
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Query OK, 0 rows affected (0.007 sec)
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3. When the RESET MASTER in #1 is killed with CTRL+c, the query shows as "Killed starting" in the processlist;
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11.2.6 a8517608894f43954e210035d357400b3d637195 (Debug) |
11.2.6-dbg>SHOW PROCESSLIST;
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+----+------+-----------+------+---------+------+----------+------------------+----------+
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| Id | User | Host | db | Command | Time | State | Info | Progress |
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+----+------+-----------+------+---------+------+----------+------------------+----------+
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| 5 | root | localhost | test | Killed | 37 | starting | RESET master | 0.000 |
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| 6 | root | localhost | test | Query | 0 | starting | show processlist | 0.000 |
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+----+------+-----------+------+---------+------+----------+------------------+----------+
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2 rows in set (0.000 sec)
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4. When the RESET MASTER is executing, mariadb-admin will hang.
https://mariadb.com/kb/en/innodb-system-variables/#innodb_flush_log_at_timeout
Attachments
Issue Links
- duplicates
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- Closed
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