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  1. Kafka
  2. KAFKA-8521

Client unable to get a complete transaction set of messages using a single poll call

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    Details

    • Type: Bug
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: clients
    • Labels:
      None

      Description

      I am unable to reliably get a complete list of messages from a successful transaction on a client side.

      What I get instead sometimes is a subset of a complete transaction in one poll and a second half of a transaction in a second poll.

      Am I right that poll should always give me a full transaction message set if a transaction was committed and client uses read_committed isolation level or not?

       

      Pseudo code:

      Server:

      begin transaction

      send (1, "test1")

      send (2, "test2")

      commit transaction

       

      Client:

      isolation level: read_committed

      poll -> [ 1 ]

      poll -> [ 2 ]

       

      What I want is:

      poll -> [1, 2]

       

      Also what I observed, when keys are the same for the messages in the transaction I always get a complete message set in one poll, but when keys are very different in inside transaction I usually get transaction spread across multiple polls.

       

      I can provide a working example if you think that this is a bug and not a misunderstanding of how poll works.

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            • Assignee:
              Unassigned
              Reporter:
              cyberbob Boris Rybalkin
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              • Created:
                Updated: