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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8071) Avoid an extra packet in client code when nagling is disabled
Date Wed, 15 Feb 2012 13:55:02 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13208475#comment-13208475
] 

Hudson commented on HADOOP-8071:
--------------------------------

Integrated in Hadoop-Mapreduce-trunk #991 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/991/])
    HADOOP-8071. Avoid an extra packet in client code when nagling is disabled. Contributed
by Todd Lipcon. (Revision 1244189)

     Result = SUCCESS
todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1244189
Files : 
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java

                
> Avoid an extra packet in client code when nagling is disabled
> -------------------------------------------------------------
>
>                 Key: HADOOP-8071
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8071
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc
>    Affects Versions: 0.23.1
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Minor
>             Fix For: 0.24.0, 0.23.2
>
>         Attachments: hadoop-8071.txt
>
>
> Currently, if you disable TCP_NODELAY in the IPC client, you get an extra packet for
each call which contains the call's length. This is unnecessary. Instead, we can just reserve
the 4 bytes in the buffer up front, then go back to fill it in before pushing the call to
the wire.

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