[jira] [Created] (KAFKA-9224) State store should not see uncommitted transaction result

["Boyang Chen (Jira)" <ji...@apache.org>]

Boyang Chen created KAFKA-9224:
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             Summary: State store should not see uncommitted transaction result
                 Key: KAFKA-9224
                 URL: https://issues.apache.org/jira/browse/KAFKA-9224
             Project: Kafka
          Issue Type: Improvement
            Reporter: Boyang Chen
            Assignee: Boyang Chen


Currently under EOS, the write to state store is not guaranteed to happen after the ongoing transaction is finished. This means interactive query could see uncommitted data within state store which is not ideal for users relying on state stores for strong consistency. Ideally, we should have an option to include state store commit as part of ongoing transaction, however an immediate step towards a better reasoned system is to `write after transaction commit`, which means we always buffer data within stream cache for EOS until the ongoing transaction is committed.



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