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  1. MariaDB Server
  2. MDEV-11635

innodb.innodb_mysql test hangs

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    Details

    • Type: Bug
    • Status: Closed (View Workflow)
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 10.2.3
    • Fix Version/s: 10.2.3
    • Component/s: Server
    • Labels:
      None
    • Environment:
      Debian GNU/Linux unstable

      Description

      The following test (adapted from innodb.innodb_mysql) reports a timeout for LOCK TABLES:

      --source include/have_innodb.inc
      CREATE TABLE t1 (a INT) ENGINE=InnoDB;
      CREATE TABLE t2 (a INT) ENGINE=InnoDB;
      SET AUTOCOMMIT=0;
      INSERT INTO t2 VALUES (1);
      CONNECT  c1,localhost,root,,;
      SET AUTOCOMMIT=0;
      SET lock_wait_timeout=1;
      LOCK TABLES t1 READ, t2 READ;
      disconnect c1;
      connection default;
      DROP TABLE t1,t2;
      

      In 10.2, this will fail as follows:

      mysqltest: At line 9: query 'LOCK TABLES t1 READ, t2 READ' failed: 1205: Lock wait timeout exceeded; try restarting transaction
      

      In MariaDB 10.2, the test innodb.innodb_mysql would hang because a change with the two SET statements below was not merged from MySQL 5.7 commit 704231728c05:

      SET @old_lock_wait_timeout= @@lock_wait_timeout;
      SET lock_wait_timeout= 1;
      --error ER_LOCK_WAIT_TIMEOUT
      LOCK TABLES t1 READ, t2 READ;
      

      Possibly the following change was merged incorrectly from MySQL 5.7:
      WL#6671: Improve scalability by not using thr_lock.c locks for InnoDB tables
      It mentions a change to the LOCK TABLES…READ behaviour.

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            Assignee:
            marko Marko Mäkelä
            Reporter:
            marko Marko Mäkelä
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              Updated:
              Resolved:

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