[jira] [Created] (KAFKA-5074) Transition to OnlinePartition without preferred leader in ISR fails

["Dustin Cote (JIRA)" <ji...@apache.org>]

Dustin Cote created KAFKA-5074:
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             Summary: Transition to OnlinePartition without preferred leader in ISR fails
                 Key: KAFKA-5074
                 URL: https://issues.apache.org/jira/browse/KAFKA-5074
             Project: Kafka
          Issue Type: Bug
          Components: controller
    Affects Versions: 0.9.0.0
            Reporter: Dustin Cote


Running 0.9.0.0, the controller can get into a state where it no longer is able to elect a leader for an Offline partition. It's unclear how this state is first achieved but in the steady state, this happens:
-There are partitions with a leader of -1
-The Controller repeatedly attempts a preferred leader election for these partitions
-The preferred leader election fails because the only replica in the ISR is not the preferred leader

The log cycle looks like this:
{code}
[2017-04-12 18:00:18,891] INFO [Controller 8]: Starting preferred replica leader election for partitions topic,1
[2017-04-12 18:00:18,891] INFO [Partition state machine on Controller 8]: Invoking state change to OnlinePartition for partitions topic,1
[2017-04-12 18:00:18,892] INFO [PreferredReplicaPartitionLeaderSelector]: Current leader -1 for partition [topic,1] is not the preferred replica. Trigerring preferred replica leader election (kafka.controller.PreferredReplicaPartitionLeaderSelector)
[2017-04-12 18:00:18,893] WARN [Controller 8]: Partition [topic,1] failed to complete preferred replica leader election. Leader is -1 (kafka.controller.KafkaController)
{code}

It's not clear if this would happen on versions later that 0.9.0.0.



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