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  1. Drivers
  2. DRIVERS-591

Transaction test runner should use "local" read concern when asserting the final collection state

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    • Type: Icon: Bug Bug
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
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    • Component/s: None
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      Key Status/Resolution FixVersion
      PYTHON-1691 Fixed 3.8
      NODE-1793 Fixed 3.2.0
      SCALA-483 Done
      CSHARP-2452 Fixed 2.9.0
      PERL-1048 Done 2.1.1
      RUBY-1614 Fixed 2.9.0.rc0
      JAVA-3121 Works as Designed
      CXX-1704 Fixed 3.6.0-rc0, 3.6.0
      PHPLIB-403 Done
      MOTOR-294 Gone away
      GODRIVER-690 Fixed 1.1.0
      CDRIVER-2901 Fixed 1.15.0
      RUST-95 Won't Fix
      SWIFT-568 Done
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      Useful Info

      Lead:
      POCs:

      Summary:
      The transaction spec test runner says:

      #. For each element in ``outcome``:

   - If ``name`` is "collection", verify that the test collection contains
     exactly the documents in the ``data`` array. Ensure this find uses
     Primary read preference even when the MongoClient is configured with
     another read preference.

      However, when a test configures the client with readConcern=majority and performs a write with w=1, then the subsequent find will run with readConcern=majority and possibly miss the w=1 write depending on the current majority commit point.

      To ensure the find remains causally consistent with previous operations we must use "local" read concern while reading the latest data on the primary.

      Final Specification:
      https://github.com/mongodb/specifications/commit/0b8c2e9cef44848a89ec9b5aceeb3f5382879d46

            Assignee:
            Unassigned Unassigned
            Reporter:
            shane.harvey@mongodb.com Shane Harvey
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              Created:
              Updated:
              Resolved: