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https://issues.apache.org/jira/browse/KAFKA-5642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16312498#comment-16312498
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James Cheng commented on KAFKA-5642:
------------------------------------
The logging change that Jun mentioned (that reduces time from 6.5 min to 30
seconds) is this one: https://issues.apache.org/jira/browse/KAFKA-6116
> Use async ZookeeperClient in Controller
> ---------------------------------------
>
> Key: KAFKA-5642
> URL: https://issues.apache.org/jira/browse/KAFKA-5642
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Onur Karaman
> Assignee: Onur Karaman
> Fix For: 1.1.0
>
>
> 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.
> KAFKA-5501 introduced an async ZookeeperClient that encourages pipelined
> requests to zookeeper. We should replace ZkClient's usage with this client.
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