Jiangjie Qin created KAFKA-6029:
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Summary: Controller should wait for the leader migration to finish
before ack a ControlledShutdownRequest
Key: KAFKA-6029
URL: https://issues.apache.org/jira/browse/KAFKA-6029
Project: Kafka
Issue Type: Improvement
Components: controller, core
Affects Versions: 1.0.0
Reporter: Jiangjie Qin
Fix For: 1.1.0
In the controlled shutdown process, the controller will return the
ControlledShutdownResponse immediately after the state machine is updated.
Because the LeaderAndIsrRequests and UpdateMetadataRequests may not have been
successfully processed by the brokers, the leader migration and active ISR
shrink may not have done when the shutting down broker proceeds to shut down.
This will cause some of the leaders to take up to replica.lag.time.max.ms to
kick the broker out of ISR. Meanwhile the produce purgatory size will grow.
Ideally, the controller should wait until all the LeaderAndIsrRequests and
UpdateMetadataRequests has been acked before sending back the
ControlledShutdownResponse.
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