Jiangjie Qin created KAFKA-2437:
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Summary: Controller lost /controller zookeeper watcher.
Key: KAFKA-2437
URL: https://issues.apache.org/jira/browse/KAFKA-2437
Project: Kafka
Issue Type: Bug
Reporter: Jiangjie Qin
Assignee: Jiangjie Qin
We see this issue occasionally. The symptom is that when /controller path got
deleted, the old controller does not resign so we end up having more than one
controller in the cluster (although the requests from controller with old epoch
will not be accepted). After checking zookeeper watcher by using wchp, it looks
the zookeeper session who created the /controller path does not have a watcher
on /controller. That causes the old controller not resigning.
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