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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

    • Task
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 4.7.0
    • Sharding
    • Fully Compatible
    • 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

              pierlauro.sciarelli@mongodb.com Pierlauro Sciarelli
              tommaso.tocci@mongodb.com Tommaso Tocci
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              Dates

                Created:
                Updated:
                Resolved: