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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5945) Reduce buffer copies in IPC server response path
Date Sat, 12 Jan 2013 01:43:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13551743#comment-13551743
] 

Devaraj Das commented on HBASE-5945:
------------------------------------

[~stack], just trying to understand - are you saying that we preserve most of the current
RPC header/body structure, and commit the patch here with a focus on removing buffer copies?
(the RPC.proto in the last patch here has the description of the RPC header/body). Then follow
it up on 7533 with the spec'ed out RPC header/body and a separate patch ?
                
> 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/RPC
>    Affects Versions: 0.96.0
>            Reporter: Todd Lipcon
>            Assignee: stack
>            Priority: Blocker
>             Fix For: 0.96.0
>
>         Attachments: 5945-in-progress.2.1.patch, 5945-in-progress.2.patch, 5945-in-progress.patch,
buffer-copies.txt, even-fewer-copies.txt, hbase-5495.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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