[jira] [Created] (KAFKA-12996) OffsetOutOfRange not handled correctly for diverging epochs when fetch offset less than leader start offset

["Rajini Sivaram (Jira)" <ji...@apache.org>]

Rajini Sivaram created KAFKA-12996:
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             Summary: OffsetOutOfRange not handled correctly for diverging epochs when fetch offset less than leader start offset
                 Key: KAFKA-12996
                 URL: https://issues.apache.org/jira/browse/KAFKA-12996
             Project: Kafka
          Issue Type: Bug
          Components: core
    Affects Versions: 2.8.0
            Reporter: Rajini Sivaram
            Assignee: Rajini Sivaram
             Fix For: 3.0.0, 2.8.1


{color:#24292e}If fetchOffset < startOffset, we currently throw OffsetOutOfRangeException when attempting to read from the log in the regular case. But for diverging epochs, we return Errors.NONE with the new leader start offset, hwm etc.. ReplicaFetcherThread throws OffsetOutOfRangeException when processing responses with Errors.NONE if the leader's offsets in the response are out of range and this moves the partition to failed state. We should add a check for this case when processing fetch requests and ensure OffsetOutOfRangeException is thrown regardless of epochs.{color}



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