[jira] [Created] (KAFKA-1581) Log cleaner should have an option to ignore messages without keys

["Joel Koshy (JIRA)" <ji...@apache.org>]

Joel Koshy created KAFKA-1581:
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             Summary: Log cleaner should have an option to ignore messages without keys
                 Key: KAFKA-1581
                 URL: https://issues.apache.org/jira/browse/KAFKA-1581
             Project: Kafka
          Issue Type: Bug
            Reporter: Joel Koshy


Right now, there is a strict requirement that compacted topics contain only messages with keys. This makes sense, but the issue with a hard requirement is that if it fails the cleaner quits. We should probably allow ignoring these messages (with a warning). Alternatively, we can catch this scenario (instead of the hard requirement) and just skip compaction for that partition.

This came up because I saw an invalid message (compressed and without a key) in the offsets topic which broke both log compaction and the offset load process. I filed KAFKA-1580 to prevent that from happening in the first place but KAFKA-1580 is only for internal topics. In the general case (compacted non-internal topics) we would not want the cleaners to exit permanently due to an invalid (key-less) message in one of the partitions since that would prevent compaction for other partitions as well.




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