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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