[jira] [Created] (KAFKA-5835) CommitFailedException message is misleading and cause is swallowed

["Stevo Slavic (JIRA)" <ji...@apache.org>]

Stevo Slavic created KAFKA-5835:
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             Summary: CommitFailedException message is misleading and cause is swallowed
                 Key: KAFKA-5835
                 URL: https://issues.apache.org/jira/browse/KAFKA-5835
             Project: Kafka
          Issue Type: Bug
          Components: clients
    Affects Versions: 0.11.0.0
            Reporter: Stevo Slavic
            Priority: Trivial


{{CommitFailedException}}'s message suggests that it can only be thrown as consequence of rebalancing. JavaDoc of the {{CommitFailedException}} suggests differently that in general it can be thrown for any kind of unrecoverable failure from {{KafkaConsumer#commitSync()}} call (e.g. if offset being committed is invalid / outside of range).

{{CommitFailedException}}'s message is misleading in a way that one can just see the message in logs, and without consulting JavaDoc or source code one can assume that message is correct and that rebalancing is the only potential cause, so one can wast time proceeding with the debugging in wrong direction.

Additionally, since {{CommitFailedException}} can be thrown for different reasons, cause should not be swallowed. This makes impossible to handle each potential cause in a specific way. If the cause is another exception please pass it as cause, or construct appropriate exception hierarchy with specific exception for every failure cause and make {{CommitFailedException}} abstract.



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