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  1. MariaDB Server
  2. MDEV-33668

Adapt parallel slave's round-robin scheduling to XA events

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    Description

      This ticket offers an alternative to MDEV-33667 solution for improving parallel slave performance of XA transaction load.
      Round-robin distribution is mingled with assigning XA-"COMPLETE" events to the same
      slave workers that currently may be processing respective XA-PREPARE parts.

      The algorithm tries to reach fair distribution but it can't provide the parallelism of
      XA-PREPARE with XA-COMMIT (ROLLBACK).

      Currently knielsen_xa_sched_minimal_fix branch contains such solution.

      10.6 Rebase branch: bb-10.6-MDEV-33668
      https://github.com/MariaDB/server/commits/bb-10.6-MDEV-33668/

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          is blocked by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-27512 Assertion `! thd->transaction_rollback_request' failed in rows_event_stmt_cleanup

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          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-21107 Assertion `!tmp_gco->next_gco || tmp_gco->last_sub_id > sub_id' failed in finish_event_group

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

          New Feature - A new feature of the product, which has yet to be developed. MDEV-31949 slow parallel replication of user xa

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

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              Elkin Andrei Elkin
              Elkin Andrei Elkin
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