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https://issues.apache.org/jira/browse/KAFKA-8522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16911942#comment-16911942
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Richard Yu commented on KAFKA-8522:
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Alright, sounds good.
> Tombstones can survive forever
> ------------------------------
>
> Key: KAFKA-8522
> URL: https://issues.apache.org/jira/browse/KAFKA-8522
> Project: Kafka
> Issue Type: Improvement
> Components: log cleaner
> Reporter: Evelyn Bayes
> Priority: Minor
>
> This is a bit grey zone as to whether it's a "bug" but it is certainly
> unintended behaviour.
>
> Under specific conditions tombstones effectively survive forever:
> * Small amount of throughput;
> * min.cleanable.dirty.ratio near or at 0; and
> * Other parameters at default.
> What happens is all the data continuously gets cycled into the oldest
> segment. Old records get compacted away, but the new records continuously
> update the timestamp of the oldest segment reseting the countdown for
> deleting tombstones.
> So tombstones build up in the oldest segment forever.
>
> While you could "fix" this by reducing the segment size, this can be
> undesirable as a sudden change in throughput could cause a dangerous number
> of segments to be created.
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