huxihx created KAFKA-6550:

             Summary: UpdateMetadataRequest should be lazily created
                 Key: KAFKA-6550
             Project: Kafka
          Issue Type: Improvement
          Components: controller
    Affects Versions: 1.0.0
            Reporter: huxihx
            Assignee: huxihx

In ControllerBrokerRequestBatch.sendRequestsToBrokers, there is no need to 
eagerly construct the UpdateMetadataRequest.Builder since sometimes 
updateMetadataRequestBrokerSet is actually empty. In those cases, we should 
defer the construction to the time when we really need them.

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