Jason Gustafson created KAFKA-13972:
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Summary: Reassignment cancellation causes stray replicas
Key: KAFKA-13972
URL: https://issues.apache.org/jira/browse/KAFKA-13972
Project: Kafka
Issue Type: Bug
Reporter: Jason Gustafson
A stray replica is one that is left behind on a broker after the partition has
been reassigned to other brokers or the partition has been deleted. We found
one case where this can happen is after a cancelled reassignment. When a
reassignment is cancelled, the controller sends `StopReplica` requests to any
of the adding replicas, but it does not necessarily bump the leader epoch.
Following
[KIP-570|[https://cwiki.apache.org/confluence/display/KAFKA/KIP-570%3A+Add+leader+epoch+in+StopReplicaRequest],]
brokers will ignore `StopReplica` requests if the leader epoch matches the
current partition leader epoch. So we need to bump the epoch whenever we need
to ensure that `StopReplica` will be received.
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