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https://issues.apache.org/jira/browse/KAFKA-5501?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jun Rao resolved KAFKA-5501.
----------------------------
Resolution: Fixed
Fix Version/s: 1.0.0
Issue resolved by pull request 3427
[https://github.com/apache/kafka/pull/3427]
> 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
> Fix For: 1.0.0
>
>
> 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.
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