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  1. MariaDB Server
  2. MDEV-29642

Server Crash During XA Prepare Can Break Replication

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Details

    • Bug
    • Status: Closed (View Workflow)
    • Major
    • Resolution: Duplicate
    • 10.5, 10.6, 10.7, 10.8, 10.9, 10.10
    • N/A
    • Replication
    • None

    Description

      If a slave crashes (unrelated) while processing an XA PREPARE such that the event fully commits in the binlog and innodb; however, crashes before updating gtid_slave_pos, attempts to restart the slave SQL thread will crash with errors such as out-of-order GTID attempt (if gtid strict mode is enabled) or XID already exists (otherwise). The following comment in Xid_apply_log_event::do_apply_event() documents this behavior.

        /*
      		 
          ...
      		 
          
          XA_PREPARE_LOG_EVENT also updates the gtid table *but* the update gets
      		 
          committed as separate "autocommit" transaction.
      		 
        */

      I think logic should be added to detect the possibility of a crash happening before the separate transaction completes, and if so, automatically update gtid slave state on restart, because gtid_binlog_pos will already be updated.

      Attachments

        Issue Links

          relates to

          Task - A task that needs to be done. MDEV-742 LP:803649 - Xa recovery failed on client disconnection

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-31038 Parallel Replication Breaks if XA PREPARE Fails Updating Slave GTID State

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-21469 Implement crash-safe logging of the user XA

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-30165 X-lock on supremum for prepared transaction for RR

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

          Activity

            People

              Elkin Andrei Elkin
              bnestere Brandon Nesterenko
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              Dates

                Created:
                Updated:
                Resolved:

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