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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8069) Enable TCP_NODELAY by default for IPC
Date Tue, 29 Jul 2014 11:29:41 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14077626#comment-14077626
] 

Hudson commented on HADOOP-8069:
--------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk #627 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/627/])
HADOOP-8069. Enable TCP_NODELAY by default for IPC. (Contributed by Todd Lipcon) (arp: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1614242)
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java
* /hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/resources/core-default.xml


> Enable TCP_NODELAY by default for IPC
> -------------------------------------
>
>                 Key: HADOOP-8069
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8069
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc
>    Affects Versions: 0.23.0, 2.4.1
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 3.0.0, 2.6.0
>
>         Attachments: hadoop-8069.txt
>
>
> I think we should switch the default for the IPC client and server NODELAY options to
true. As wikipedia says:
> {quote}
> In general, since Nagle's algorithm is only a defense against careless applications,
it will not benefit a carefully written application that takes proper care of buffering; the
algorithm has either no effect, or negative effect on the application.
> {quote}
> Since our IPC layer is well contained and does its own buffering, we shouldn't be careless.



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