Kafka not deleting key with tombstone

Question

I create a kafka topic with below properties

min.cleanable.dirty.ratio=0.01,delete.retention.ms=100,segment.ms=100,cleanup.policy=compact

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Answer 1

The algorithm for removing the tombstone in a compacted is supposed to be the following.

1. Tombstone is never removed when it's still in the dirty portion of the log.
2. After the tombstone is in the cleaned portion of the log, we further delay the removal of the tombstone by delete.retention.ms since the time the tombstone is in the cleaned portion.

It's possible that the tombstones are still in the dirty portion of the log and hence not cleared. Triggering a few more messages of different keys should push the tombstones into the cleaned portion of the log and delete them.