[jira] [Created] (KAFKA-5501) use async zookeeper apis everywhere

["Onur Karaman (JIRA)" <ji...@apache.org>]

Onur Karaman created KAFKA-5501:
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             Summary: use async zookeeper apis everywhere
                 Key: KAFKA-5501
                 URL: https://issues.apache.org/jira/browse/KAFKA-5501
             Project: Kafka
          Issue Type: Sub-task
            Reporter: Onur Karaman
            Assignee: Onur Karaman


Synchronous zookeeper writes means that we wait an entire round trip before doing the next write. These synchronous writes are happening at a per-partition granularity in several places, so partition-heavy clusters suffer from the controller doing many sequential round trips to zookeeper.
* PartitionStateMachine.electLeaderForPartition updates leaderAndIsr in zookeeper on transition to OnlinePartition. This gets triggered per-partition sequentially with synchronous writes during controlled shutdown of the shutting down broker's replicas for which it is the leader.
* ReplicaStateMachine updates leaderAndIsr in zookeeper on transition to OfflineReplica when calling KafkaController.removeReplicaFromIsr. This gets triggered per-partition sequentially with synchronous writes for failed or controlled shutdown brokers.



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