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Posted to dev@kafka.apache.org by "huxihx (JIRA)" <ji...@apache.org> on 2019/01/02 09:23:00 UTC

[jira] [Created] (KAFKA-7779) Avoid unnecessary loop iteration in leastLoadedNode

huxihx created KAFKA-7779:
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             Summary: Avoid unnecessary loop iteration in leastLoadedNode
                 Key: KAFKA-7779
                 URL: https://issues.apache.org/jira/browse/KAFKA-7779
             Project: Kafka
          Issue Type: Improvement
          Components: network
    Affects Versions: 2.1.0
            Reporter: huxihx


In NetworkClient.leastLoadedNode, it invokes `isReady` to  check if an established connection exists for the given node. `isReady` checks whether metadata needs to be updated also which wants to make metadata request first priority. However, if the to-be-sent request is metadata request, then we do not have to check this otherwise the loop in `leastLoadedNode` will do a complete iteration until the final node is selected. That's not performance efficient for a large cluster.

 



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