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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