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  1. Core Server
  2. SERVER-61458

Calling RSLocalClient::queryOnce(kMajorityReadConcern) causes subsequent local writes in same OperationContext to also read stale data

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Details

    • Bug
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • 4.0.0, 4.2.0, 4.4.0, 5.0.0, 5.1.0
    • 5.2.0
    • Internal Client
    • None
    • Fully Compatible
    • ALL
    • Execution Team 2021-11-29
    • 152

    Description

      RSLocalClient::queryOnce(kMajorityReadConcern) will modify the ReadSource for the RecoveryUnit to be kMajorityCommitted. It won't restore the original ReadSource upon returning from the function. This issue was discovered during SERVER-59831 because it caused a later write using the same OperationContext to still be using kMajorityCommitted as its ReadSource and for the later write not to see the effects of an earlier write from secondary batch application.

      if (readConcernLevel == repl::ReadConcernLevel::kMajorityReadConcern) {
      		 
          // Set up operation context with majority read snapshot so correct optime can be retrieved.
      		 
          opCtx->recoveryUnit()->setTimestampReadSource(RecoveryUnit::ReadSource::kMajorityCommitted);
      		 
          ...
      		 
      }

      My thought here would be to introduce a new RAII type to enable the ReadSource to be temporarily overridden and to use it in RSLocalClient::queryOnce().

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          is related to

          Bug - A problem which impairs or prevents the functions of the product. SERVER-59831 WTUniqueIndex::_insert expects secondaries to pass in dupsAllowed=true

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

          Bug - A problem which impairs or prevents the functions of the product. SERVER-61459 ShardingCatalogManager::assignKeyRangeToZone() reads stale version of CollectionType while running locally on config server primary

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

          New Feature - A new feature of the product, which has yet to be developed. SERVER-57566 Implement sharding admin commands behaviour for time series collection

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

          Task - A task that needs to be done. SERVER-61704 Investigate the usage of abandonSnapshot() in ReadSourceScope

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

          Activity

            People

              yuhong.zhang@mongodb.com Yuhong Zhang
              max.hirschhorn@mongodb.com Max Hirschhorn
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              Dates

                Created:
                Updated:
                Resolved: