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  1. Sub-task KAFKA-7299
    batch LeaderAndIsr requests during auto preferred leader election
  2. Sub-task KAFKA-6330
    KafkaZkClient request queue time metric
  3. Sub-task KAFKA-6320
    move ZK metrics in KafkaHealthCheck to ZookeeperClient
  4. Sub-task KAFKA-6146
    minimize the number of triggers enqueuing PreferredReplicaLeaderElection events
  5. Sub-task KAFKA-6111
    Tests for KafkaZkClient
  6. Sub-task KAFKA-6082
    consider fencing zookeeper updates with controller epoch zkVersion
  7. Sub-task KAFKA-6081
    response error code checking
  8. Sub-task KAFKA-6074
    Use ZookeeperClient in ReplicaManager and Partition
  9. Sub-task KAFKA-6073
    Use ZookeeperClient in KafkaApis
  10. Sub-task KAFKA-6072
    Use ZookeeperClient in GroupCoordinator and TransactionCoordinator
  11. Sub-task KAFKA-6071
    Use ZookeeperClient in LogManager
  12. Sub-task KAFKA-6065
    Add ZooKeeperRequestLatencyMs to KafkaZkClient
  13. Sub-task KAFKA-6029
    Controller should wait for the leader migration to finish before ack a ControlledShutdownRequest
  14. Sub-task KAFKA-5894
    add the notion of max inflight requests to async ZookeeperClient
  15. Sub-task KAFKA-5647
    Use async ZookeeperClient for Admin operations
  16. Sub-task KAFKA-5646
    Use async ZookeeperClient for DynamicConfigManager
  17. Sub-task KAFKA-5645
    Use async ZookeeperClient in SimpleAclAuthorizer
  18. Sub-task KAFKA-5642
    Use async ZookeeperClient in Controller
  19. Sub-task KAFKA-5502
    read current brokers from zookeeper upon processing broker change
  20. Sub-task KAFKA-5501
    introduce async ZookeeperClient
  21. Sub-task KAFKA-5473
    handle ZK session expiration properly when a new session can't be established
  22. Sub-task KAFKA-5328
    consider switching json parser from scala to jackson
  23. Sub-task KAFKA-5310
    reset ControllerContext during resignation
  24. Sub-task KAFKA-5258
    move all partition and replica state transition rules into their states
  25. Sub-task KAFKA-5197
    add a tool analyzing zookeeper client performance across its various apis
  26. Sub-task KAFKA-5107
    remove preferred replica election state from ControllerContext
  27. Sub-task KAFKA-5083
    always leave the last surviving member of the ISR in ZK
  28. Sub-task KAFKA-5069
    add controller integration tests
  29. Sub-task KAFKA-5029
    cleanup javadocs and logging
  30. Sub-task KAFKA-5028
    convert kafka controller to a single-threaded event queue model
  31. Sub-task KAFKA-1120
    Controller could miss a broker state change
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