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From "huxihx (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-7779) Avoid unnecessary loop iteration in leastLoadedNode
Date Wed, 02 Jan 2019 09:23:00 GMT
huxihx created KAFKA-7779:

             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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