Jun Rao created KAFKA-4546:
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Summary: a consumer could miss tombstone when leader changes
during the reads
Key: KAFKA-4546
URL: https://issues.apache.org/jira/browse/KAFKA-4546
Project: Kafka
Issue Type: Bug
Affects Versions: 0.8.2.1
Reporter: Jun Rao
Currently, in a compacted topic, we delay the removal of a tombstone by
delete.retention.ms to avoid the case that a consumer reads a non-tombstone
before the tombstone, then tombstone is removed and the consumer misses the
tombstone.
However, tombstones are removed independently in different replicas. Supposed
that a tombstone is already removed in the follower, but not in the leader. A
consumer could read a non-tombstone message on the leader, then the leader
changes, and the consumer will miss the tombstone on the new leader since it's
already deleted.
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