[jira] [Created] (KAFKA-4546) a consumer could miss tombstone when leader changes during the reads

["Jun Rao (JIRA)" <ji...@apache.org>]

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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