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  1. C# Driver
  2. CSHARP-4801

Accessing ChangeStreamDocument.FullDocumentBeforeChange throw if pre-image was already expired

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    • Type: Icon: Bug Bug
    • Resolution: Fixed
    • Priority: Icon: Unknown Unknown
    • 2.22.0
    • Affects Version/s: None
    • Component/s: None
    • None
    • Fully Compatible
    • Not Needed
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      1. What would you like to communicate to the user about this feature?
      2. Would you like the user to see examples of the syntax and/or executable code and its output?
      3. Which versions of the driver/connector does this apply to?

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      1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?

      Try to access FullDocumentBeforeChange property of change stream change document throws "Unable to cast object of type 'MongoDB.Bson.BsonNull' to type 'MongoDB.Bson.BsonDocument" exception if pre-image for the change was already expired by the cluster.

      Steps to reproduce:

      1. Set 10 seconds pre-images expiration period:

      use admin
db.runCommand({
  setClusterParameter: { changeStreamOptions: { preAndPostImages: { expireAfterSeconds: 10 } } }
}) 

      2. Store some resume token.

      3. Make some changes into the collection (including document deletion).

      4. Wait for some time to let cluster expire the pre-images.

      5. Run change stream and try to access FullDocumentBeforeChange for the deleted document.

            Assignee:
            oleksandr.poliakov@mongodb.com Oleksandr Poliakov
            Reporter:
            oleksandr.poliakov@mongodb.com Oleksandr Poliakov
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              Created:
              Updated:
              Resolved: