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  1. Core Server
  2. SERVER-56779

Do not use the collection distributed lock for chunk merges

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    Details

    • Backwards Compatibility:
      Fully Compatible
    • Backport Requested:
      v5.0, v4.4, v4.2, v4.0
    • Sprint:
      Sharding EMEA 2021-05-17
    • Case:

      Description

      Currently chunk merges acquire the collection distributed lock. This means that it is not possible to run more than one merge at a time for the entire cluster or if there are any ongoing splits or balancing (again for the entire cluster).

      This ticket is to figure out how to remove the dist lock acquisition from merges without causing the much more expensive moves to start failing, because the chunk being moved got merged.

        Attachments

          Issue Links

          causes

          Bug - A problem which impairs or prevents the functions of the product. SERVER-59929 unexpected slower update/insert operation bease of splitchunk and moveChunk

          • Major - P3 - Major loss of function.
          • Investigating
          is depended on by

          Task - A task that needs to be done. SERVER-57032 Acquire only local distLock for Sharding DDL coordinators

          • Major - P3 - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-56654 Do not use the collection distributed lock for chunk splits

          • Major - P3 - Major loss of function.
          • Closed
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. SERVER-57115 Merge chunks should wait for any ongoing moves to complete

          • Major - P3 - Major loss of function.
          • Closed
          is related to

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-56786 There are three routing info refreshes and two chunk scans on the mergeChunks path

          • Major - P3 - Major loss of function.
          • Closed

            Activity

              People

              Assignee:
              kaloian.manassiev Kaloian Manassiev
              Reporter:
              kaloian.manassiev Kaloian Manassiev
              Participants:
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                Dates

                Created:
                Updated:
                Resolved: