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From "Jiangjie Qin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-6029) Controller should wait for the leader migration to finish before ack a ControlledShutdownRequest
Date Mon, 09 Oct 2017 18:59:00 GMT
Jiangjie Qin created KAFKA-6029:
-----------------------------------

             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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