Jun Rao commented on KAFKA-6780:

The fix is probably to further bound firstUncleanableDirtyOffset by the high 

> 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
>            Priority: Major
> 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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