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https://issues.apache.org/jira/browse/HADOOP-18533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17636171#comment-17636171
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ASF GitHub Bot commented on HADOOP-18533:
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huxinqiu opened a new pull request, #5151:
URL: https://github.com/apache/hadoop/pull/5151
### Description of PR
JIRA - [HADOOP-18533](https://issues.apache.org/jira/browse/HADOOP-18533)
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. And avoid allocating 1024
bytes of ResponseBuffer each time a request is sent.
Perhaps if the rpc engine is ProtobufRpcEngine2, we can pre-calculate the
request size, and then send the request directly to the socket buffer, reducing
one memory copy.
> 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: xinqiu.hu
> 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. And avoid allocating 1024
> bytes of ResponseBuffer each time a request is sent.
> 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.
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