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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8069) Enable TCP_NODELAY by default for IPC
Date Thu, 24 Jul 2014 22:47:39 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14073779#comment-14073779
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Arpit Agarwal commented on HADOOP-8069:
---------------------------------------

It makes a lot of sense to enable TCP_NODELAY by default. Any thoughts on moving forward with
Todd's patch? I'd be +1 on changing the defaults while leaving the setting documented.



> 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
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         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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