[jira] [Created] (KAFKA-5928) Avoid redundant requests to zookeeper when reassign topic partition

["Genmao Yu (JIRA)" <ji...@apache.org>]

Genmao Yu created KAFKA-5928:
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             Summary: 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: 0.11.0.0, 0.10.2.1
            Reporter: Genmao Yu


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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