Ryan Berdeen created KAFKA-1365:
-----------------------------------

             Summary: Second Manual preferred replica leader election command 
always fails
                 Key: KAFKA-1365
                 URL: https://issues.apache.org/jira/browse/KAFKA-1365
             Project: Kafka
          Issue Type: Bug
          Components: controller, tools
    Affects Versions: 0.8.1
            Reporter: Ryan Berdeen
            Assignee: Neha Narkhede


After running kafka-preferred-replica-election.sh once, a second run will fail 
with "Preferred replica leader election currently in progress for ...".

The /admin/preferred_replica_election key is never deleted from ZooKeeper, 
because the "isTriggeredByAutoRebalance" parameter to 
onPreferredReplicaElection 
(https://github.com/apache/kafka/blob/0ffec142a991849833d9767be07e895428ccaea1/core/src/main/scala/kafka/controller/KafkaController.scala#L614)
 is used incorrectly. In the automatic case 
(https://github.com/apache/kafka/blob/0ffec142a991849833d9767be07e895428ccaea1/core/src/main/scala/kafka/controller/KafkaController.scala#L1119),
 it is set to false. In the manual case 
(https://github.com/apache/kafka/blob/0ffec142a991849833d9767be07e895428ccaea1/core/src/main/scala/kafka/controller/KafkaController.scala#L1266)
 the parameter is not passed, so it defaults to true.



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