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https://issues.apache.org/jira/browse/KAFKA-5074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15969378#comment-15969378
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Ismael Juma commented on KAFKA-5074:
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I think this is expected. OfflinePartitionLeaderSelector should select a leader
from the ISR. Is this leader selector ever invoked?
> 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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