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  1. MariaDB Server
  2. MDEV-33213

History list is not shrunk unless there is a pause in the workload

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    Description

      While testing MDEV-32050 and its follow-up changes MDEV-33009 and MDEV-33112, axel pointed out that the InnoDB history list is not being shrunk during a workload.

      Some initial debugging indicates that the purge_truncation_task (which was added in MDEV-32050) is being invoked but it is not doing anything. Also, the purge_sys.view is advancing; there are no old read views that would block the purge of history. Throttling the Sysbench workload for a few seconds would allow the history list to shrink immediately.

      Attachments

        1. 10.6-MDEV-33213.pdf
          107 kB
        2. 12x5.pdf
          58 kB
        3. 24x5_high_threads_pausing.pdf
          59 kB
        4. 24x5_high_threads.pdf
          56 kB
        5. 24x5.pdf
          59 kB
        6. no_pause.png
          no_pause.png
          36 kB
        7. with_pause.png
          with_pause.png
          47 kB

        Issue Links

          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-33464 Crash when innodb_max_undo_log_size is set to innodb_page_size*4294967296

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-30628 10.6 performance regression with sustained high-connection write-only OLTP workload (55-80% degradation)

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-31676 Innodb history length keeps growing

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-32050 UNDO logs still growing for write-intensive workloads

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-33009 Server hangs for a long time with innodb_undo_log_truncate=ON

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-33112 innodb_undo_log_truncate=ON is blocking page writes

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-33315 InnoDB history length and undo tablespace files keep growing

          • Major - Major loss of function.
          • Closed

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              marko Marko Mäkelä
              marko Marko Mäkelä
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              Dates

                Created:
                Updated:
                Resolved:

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