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  1. MariaDB Server
  2. MDEV-14941

Timeouts on persistent statistics tables caused by MDEV-14511

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    Description

      When running tests with plenty of DDL with datadir on RamFS after upgrade from 10.2.11 to 10.2.12 the following errors occur repeatedly:

      [ERROR] InnoDB: Cannot save table statistics for table `some_dir`.`some_table`: Lock wait timeout

      then followed by long semaphore wait warnings on the innodb data dictionary mutex:

      Jan  5 11:54:11 bamber-02 mysqld: 2018-01-05 11:54:11 140564011710208 [Warning] InnoDB: A long semaphore wait:
      		 
      Jan  5 11:54:11 bamber-02 mysqld: --Thread 140563682322176 has waited at ha_innodb.cc line 13396 for 241.00 seconds the semaphore:
      		 
      Jan  5 11:54:11 bamber-02 mysqld: X-lock on RW-latch at 0x555673f891c0 created in file dict0dict.cc line 1107
      		 
      Jan  5 11:54:11 bamber-02 mysqld: a writer (thread id 140563590076160) has reserved it in mode  exclusive
      		 
      Jan  5 11:54:11 bamber-02 mysqld: number of readers 0, waiters flag 1, lock_word: 0
      		 
      Jan  5 11:54:11 bamber-02 mysqld: Last time read locked in file not yet reserved line 0
      		 
      Jan  5 11:54:11 bamber-02 mysqld: Last time write locked in file ha_innodb.cc line 13396
      		 
      Jan  5 11:54:11 bamber-02 mysqld: 2018-01-05 11:54:11 140564011710208 [Warning] InnoDB: A long semaphore wait:

      and finally lots of

      [ERROR] InnoDB: Cannot save table statistics for table `tmp_1e865f785ceff316`.`access_log`: Operation interrupted

      after mysqld shutdown was requested

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          is caused by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-14511 Use fewer transactions for updating InnoDB persistent statistics

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-15020 Server hangs due to InnoDB persistent statistics or innodb_stats_auto_recalc

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

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              marko Marko Mäkelä
              hholzgra Hartmut Holzgraefe
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              Dates

                Created:
                Updated:
                Resolved:

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