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From "Ravi Gummadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-284) Improvements to RPC between Child and TaskTracker
Date Mon, 03 Aug 2009 09:01:15 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12738234#action_12738234
] 

Ravi Gummadi commented on MAPREDUCE-284:
----------------------------------------

All unit tests passed on my local machine.

ant test-patch gave:

     [exec] -1 overall.
     [exec]
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec]
     [exec]     -1 tests included.  The patch doesn't appear to include any new or modified
tests.
     [exec]                         Please justify why no new tests are needed for this patch.
     [exec]                         Also please list what manual steps were performed to verify
this patch.
     [exec]
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec]
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
     [exec]
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs warnings.
     [exec]
     [exec]     +1 release audit.  The applied patch does not increase the total number of
release audit warnings.


This doesn't need a unit test as this just sets ping interval to a smaller value.
Tested manually with 3 sort jobs started at a time on 5 nodes cluster and there is no SocketTimeoutException
seen.

> 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: Arun C Murthy
>         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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