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From "Robert Joseph Evans (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8069) Enable TCP_NODELAY by default for IPC
Date Wed, 18 Apr 2012 20:34:41 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8069?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Joseph Evans updated HADOOP-8069:
----------------------------------------

    Target Version/s: 2.0.0, 3.0.0  (was: 0.23.2)
    
> 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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