Lucas Bradstreet created KAFKA-9358:
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Summary: Explicitly resign controller leadership and broker znode
Key: KAFKA-9358
URL: https://issues.apache.org/jira/browse/KAFKA-9358
Project: Kafka
Issue Type: Improvement
Components: controller, core
Reporter: Lucas Bradstreet
Assignee: Lucas Bradstreet
When shutting down the controller the broker shuts down the controller and then
closes the zookeeper connection. Closing the zookeeper connection results in
ephemeral nodes being removed. It is currently critical that the zkClient is
closed after the controller is shutdown, otherwise a controller election will
not occur if the broker being shutdown is currently the controller.
We should consider resigning leadership explicitly in the controller rather
than relying on the zookeeper client being closed. This would ensure that any
changes in shutdown order cannot lead to periods where a broker's controller
component is stopped while also maintaining leadership until the zkClient is
closed.
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