Jun Rao created KAFKA-6780:

             Summary: log cleaner shouldn't clean messages beyond high watermark
                 Key: KAFKA-6780
                 URL: https://issues.apache.org/jira/browse/KAFKA-6780
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 1.1.0
            Reporter: Jun Rao

Currently, the firstUncleanableDirtyOffset computed by the log cleaner is 
bounded by the first offset in the active segment. It's possible for the high 
watermark to be smaller than that. This may cause a committed record to be 
removed because of an uncommitted record.

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