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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