Mayuresh Gharat created KAFKA-4433:
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Summary: Kafka Controller Does not send a LeaderAndIsr to old
leader of a topicPartition during reassignment, if the old leader is not a part
of the new assigned replicas
Key: KAFKA-4433
URL: https://issues.apache.org/jira/browse/KAFKA-4433
Project: Kafka
Issue Type: Bug
Components: controller
Reporter: Mayuresh Gharat
Assignee: Mayuresh Gharat
Fix For: 0.10.2.0
Consider the following scenario :
old replicas : {[1,2,3], Leader = 1} is reassigned to new replicas : {[2,3,4],
Leader = 2}
In this case broker 1 does not receive a LeaderAndIsr request to become a
follower.
This happens because of the following :
val (leaderAndIsr, replicas) = leaderSelector.selectLeader(topicAndPartition,
currentLeaderAndIsr) in PartitionStateMachine.electLeaderForPartition(...) ,
the replicas returned by ReassignedPartitionLeaderSelector.selectLeader() is
only the new Replicas, which are then sent the LeaderAndIsrRequest. So the old
replica never receives this LeaderAndIsr.
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