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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8071) Avoid an extra packet in client code when nagling is disabled
Date Tue, 14 Feb 2012 19:47:59 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Todd Lipcon updated HADOOP-8071:

       Resolution: Fixed
    Fix Version/s: 0.23.2
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

Committed to 0.23.2 (since it's low risk) and trunk.
> 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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