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  1. Core Server
  2. SERVER-47975

Optimize ScopedShardVersionCriticalSection in order to avoid convoy on SSV after a shardVersion change

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    Details

    • Type: Task
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 4.7.0
    • Component/s: Sharding
    • Backwards Compatibility:
      Fully Compatible
    • Sprint:
      Sharding 2020-05-18, Sharding 2020-06-01

      Description

      Optimize ScopedShardVersionCriticalSection class with respect to multi-thread initialization. In particular in the case where a lot of threads try to concurrently instantiate this object.

      The idea is to avoid entering in the critical session if it is not strictly needed.

       
      Modify onShardVersionMismatch in order to:

      Update forceShardFilteringMetadataRefresh:

      • Remove forceRefreshFromThisThread flag
      • Remove unused hasAdditionalCatalogCacheForFiltering part

        Attachments

          Issue Links

          causes

          Bug - A problem which impairs or prevents the functions of the product. SERVER-48487 Use DBLock instead of AutoGetDB in onShardVersionMismatch

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

          Task - A task that needs to be done. SERVER-47974 Introduce ScopedShardVersionCriticalSection class

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

          Task - A task that needs to be done. SERVER-45983 Perform the shardVersion recovery and refresh on a separate thread from that of the user request

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

          Task - A task that needs to be done. SERVER-47982 Change the shard version update procedure of the migration source manager

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

          Task - A task that needs to be done. SERVER-47985 Implement recovery of a shard's `shardVersion` before it is allowed to perform version checking

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

          Task - A task that needs to be done. SERVER-48180 Make onShardVersionMismatch use ScopedShardVersionCriticalSection

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

            Activity

              People

              Assignee:
              pierlauro.sciarelli Pierlauro Sciarelli
              Reporter:
              tommaso.tocci Tommaso Tocci
              Participants:
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                Dates

                Created:
                Updated:
                Resolved: