Jason Gustafson created KAFKA-6639:

             Summary: Follower may have sparse index if catching up
                 Key: KAFKA-6639
                 URL: https://issues.apache.org/jira/browse/KAFKA-6639
             Project: Kafka
          Issue Type: Bug
            Reporter: Jason Gustafson
            Assignee: Dhruvil Shah

When a follower is catching up, it may fetch considerably more data than the 
size of the offset index interval. Since we only write to the index once for 
every append, this could lead to a sparsely populated index, which may have a 
performance impact if the follower ever becomes leader.

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