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https://issues.apache.org/jira/browse/HBASE-5945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269213#comment-13269213
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Todd Lipcon commented on HBASE-5945:
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Yep, I think the next improvement is to use thread-local or connection-local
buffers - perhaps even direct buffers. There's still one more copy from the
heap byte buffer to a direct buffer within the SocketChannel.write() which
would be avoided if we serialized directly into a DirectByteBuffer. Have to
benchmark whether that's worth it.
We should also do the same hacks on the client side of the connection - should
get similar gains.
> Reduce buffer copies in IPC server response path
> ------------------------------------------------
>
> Key: HBASE-5945
> URL: https://issues.apache.org/jira/browse/HBASE-5945
> Project: HBase
> Issue Type: Improvement
> Components: ipc
> Affects Versions: 0.96.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Attachments: buffer-copies.txt, even-fewer-copies.txt
>
>
> The new PB code is sloppy with buffers and makes several needless copies.
> This increases GC time a lot. A few simple changes can cut this back down.
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