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From "Arun C Murthy (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8071) Avoid an extra packet in client code when nagling is disabled
Date Wed, 28 Mar 2012 09:22:16 GMT

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

Arun C Murthy updated HADOOP-8071:
----------------------------------

    Fix Version/s:     (was: 0.24.0)
    
> 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: 0.23.2
>
>         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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