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https://issues.apache.org/jira/browse/HADOOP-4813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655105#action_12655105
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Doug Cutting commented on HADOOP-4813:
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> bytes on wire don't actually change. Is that approximately what you are
> proposing?
Yes. We might add an output operation like, writeBuffer(ByteBuffer) that adds
the stream's current output buffer to the list if anything has been buffered,
then adds the passed buffer, and resets the stream's buffer
> Avoid a buffer copy while replying to RPC requests.
> ---------------------------------------------------
>
> Key: HADOOP-4813
> URL: https://issues.apache.org/jira/browse/HADOOP-4813
> Project: Hadoop Core
> Issue Type: Improvement
> Components: ipc
> Reporter: Raghu Angadi
>
> RPC server first serializes RPC response to a ByteArrayOutputStream and then
> creates a new array to write to socket. For most responses the RPC handler is
> able to write the entire response in-line. If we could use the same buffer
> used by ByteArrayOutputStream, we can avoid this copy.
> As mentioned in HADOOP-4802, yet another copy could be avoided (in most
> cases) if we use a static direct buffer for the responses (not proposed for
> this jira).
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