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https://issues.apache.org/jira/browse/KAFKA-1020?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang updated KAFKA-1020:
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Status: Patch Available (was: Open)
> Remove getAllReplicasOnBroker from KafkaController
> --------------------------------------------------
>
> Key: KAFKA-1020
> URL: https://issues.apache.org/jira/browse/KAFKA-1020
> Project: Kafka
> Issue Type: Bug
> Reporter: Guozhang Wang
> Assignee: Guozhang Wang
>
> Today KafkaController call getAllReplicasOnBroker on broker failure and new
> broker start up to get all the replicas that broker is holding (or suppose to
> hold). This function actually issue a read on each topic's partition znodes.
> With large number of topic/partitions this could seriously increase the
> latency of handling broker failure and new broker startup.
> On the other hand, ControllerContext maintains a partitionReplicaAssignment
> cache, which is designed to keep the most updated partition replica
> assignment according to ZK. So instead of reading from ZK, we could just read
> from the local cache, given that partitionReplicaAssignment is guaranteed to
> be up-to-date.
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