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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-284) Improvements to RPC between Child and TaskTracker
Date Tue, 04 Aug 2009 08:55:15 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12738902#action_12738902
] 

Devaraj Das commented on MAPREDUCE-284:
---------------------------------------

I still don't see a strong reason for reducing the ping interval. Also, I am worried about
the approach followed in the patch. In particular, i don't like the way that ping interval
is hardcoded to 5 seconds in the Child process (overriding the configuration passed). I also
think that in the current implementation, it affects the task->namenode ping interval which
is not desirable.
I propose that for this patch, we just fix the case of TCP_NODELAY being ON by default. 
Thoughts?

> Improvements to RPC between Child and TaskTracker
> -------------------------------------------------
>
>                 Key: MAPREDUCE-284
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-284
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Arun C Murthy
>            Assignee: Ravi Gummadi
>         Attachments: MR-284.patch
>
>
> We could improve the RPC between the Child and TaskTracker:
>    * Set ping interval lower by default to 5s
>    * Disable nagle's algorithm (tcp no-delay)

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