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https://issues.apache.org/jira/browse/HADOOP-18533?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shilun Fan updated HADOOP-18533:
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Target Version/s: 3.5.0 (was: 3.4.0)
> RPC Client performance improvement
> ----------------------------------
>
> Key: HADOOP-18533
> URL: https://issues.apache.org/jira/browse/HADOOP-18533
> Project: Hadoop Common
> Issue Type: Improvement
> Components: rpc-server
> Reporter: asdfgh19
> Priority: Minor
> Labels: pull-request-available
>
> The current implementation copies the rpcRequest and header to a
> ByteArrayOutputStream in order to calculate the total length of the sent
> request, and then writes it to the socket buffer.
> But if the rpc engine is ProtobufRpcEngine2, we can pre-calculate the
> request size, and then send the request directly to the socket buffer,
> reducing a memory copy. And avoid allocating 1024 bytes of ResponseBuffer
> each time a request is sent.
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