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  1. MariaDB Server
  2. MDEV-17934

Make systemd timeout behavior more compatible with longer Galera recovery times

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    Description

      When Galera is enabled, MariaDB's systemd service executes the "galera_recovery" script as an ExecStartPre operation. See the following:

      https://github.com/MariaDB/server/blob/ce8716a1ed786ff971b5e15c88385d50b649ec7f/support-files/mariadb.service.in#L71

      The MariaDB systemd service has a default TimeoutStartSec value of 90 seconds, so if this ExecStartPre step takes longer than that, then this can cause startup to fail. For example, see the following failure from a syslog:

      Sep 13 15:48:28 server1 systemd[1]: Starting MariaDB 10.2.16 database server...
      		 
      Sep 13 15:49:58 server1 systemd[1]: mariadb.service: Start-pre operation timed out. Terminating.
      		 
      Sep 13 15:49:58 server1 systemd[1]: Failed to start MariaDB 10.2.16 database server.
      		 
      Sep 13 15:49:58 server1 systemd[1]: mariadb.service: Unit entered failed state.
      		 
      Sep 13 15:49:58 server1 systemd[1]: mariadb.service: Failed with result 'timeout'.

      galera_recovery has to perform server startup, so this step can take a while, especially if the server previously crashed, and it has to perform crash recovery. However, it looks like systemd timeouts should have been extended during server startup as part of MDEV-14705. Despite that, server versions with the fix for MDEV-14705 still see timeouts during ExecStartPre. Is it likely that important long-running startup functions were missed?

      See also MDEV-17571 as another case where systemd timeout extensions didn't seem to work as intended.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-9202 Systemd timeout is not sufficient for larger servers

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-9520 xtrabackup-v2 to support systemd node provisioning

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-15607 mysqld crashed few after node is being joined with sst

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-17003 service_manager_extend_timeout() being called too often

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-14705 systemd: EXTEND_TIMEOUT_USEC= to avoid startup and shutdown timeouts

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-15607 mysqld crashed few after node is being joined with sst

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-17571 Make systemd timeout behavior more compatible with long Galera SSTs

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

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              ratzpo Rasmus Johansson (Inactive)
              GeoffMontee Geoff Montee (Inactive)
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