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https://issues.apache.org/jira/browse/KAFKA-4229?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on KAFKA-4229 started by Pengwei.
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> Controller can't start after several zk expired event
> -----------------------------------------------------
>
> Key: KAFKA-4229
> URL: https://issues.apache.org/jira/browse/KAFKA-4229
> Project: Kafka
> Issue Type: Bug
> Components: controller
> Affects Versions: 0.9.0.0, 0.9.0.1, 0.10.0.0, 0.10.0.1
> Reporter: Pengwei
> Assignee: Pengwei
>
> We found the controller not started after several zk expired event in our
> test environment. By analysing the log, I found the controller will handle
> the ephemeral node data delete event first and then the zk expired event ,
> then the controller will gone.
> I can reproducer it on my develop env:
> 1. set up a one broker and one zk env, specify a very large zk timeout (20s)
> 2. stop the broker and remove the zk's /broker/ids/0 directory
> 3. restart the broker and make a breakpoint in the zk client's event thread
> to queue the delete event.
> 4. after the /controller node gone the breakpoint will hit.
> 5. expired the current session(suspend the send thread) and create a new
> session s2
> 6. resume the event thread, then the controller will handle
> LeaderChangeListener.handleDataDeleted and become leader
> 7. then controller will handle SessionExpirationListener.handleNewSession, it
> resign the controller and elect, but when elect it found the /controller
> node is exist and not become the leader. But the /controller node is created
> by current session s2 will not remove. So the controller is gone
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