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https://issues.apache.org/jira/browse/KAFKA-5928?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dong Lin reassigned KAFKA-5928:
-------------------------------
Assignee: Genmao Yu
> Avoid redundant requests to zookeeper when reassign topic partition
> -------------------------------------------------------------------
>
> Key: KAFKA-5928
> URL: https://issues.apache.org/jira/browse/KAFKA-5928
> Project: Kafka
> Issue Type: Improvement
> Components: admin
> Affects Versions: 0.10.2.1, 0.11.0.0, 1.0.0, 2.0.0
> Reporter: Genmao Yu
> Assignee: Genmao Yu
> Priority: Major
> Fix For: 2.1.0
>
>
> We mistakenly request topic level information according to partitions config
> in the assignment json file. For example
> https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/admin/ReassignPartitionsCommand.scala#L550:
> {code}
> val validPartitions = proposedPartitionAssignment.filter { case (p, _) =>
> validatePartition(zkUtils, p.topic, p.partition) }
> {code}
> If reassign 1000 partitions (in 10 topics), we need to request zookeeper 1000
> times here. But actually we only need to request just 10 (topics) times. We
> test a large-scale assignment, about 10K partitions. It takes tens of
> minutes. After optimization, it will reduce to less than 1minute.
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