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From "Jun Rao (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (KAFKA-5642) Use async ZookeeperClient in Controller
Date Wed, 18 Oct 2017 16:16:00 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-5642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jun Rao resolved KAFKA-5642.
----------------------------
       Resolution: Fixed
    Fix Version/s: 1.1.0

Issue resolved by pull request 3765
[https://github.com/apache/kafka/pull/3765]

> 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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