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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5251) Reducer should not implicate map attempt if it has insufficient space to fetch map output
Date Thu, 13 Jun 2013 21:01:21 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13682727#comment-13682727
] 

Hadoop QA commented on MAPREDUCE-5251:
--------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12587690/MAPREDUCE-5251-2.txt
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3767//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3767//console

This message is automatically generated.
                
> Reducer should not implicate map attempt if it has insufficient space to fetch map output
> -----------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5251
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5251
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.7, 2.0.4-alpha
>            Reporter: Jason Lowe
>            Assignee: Ashwin Shankar
>         Attachments: MAPREDUCE-5251-2.txt
>
>
> A job can fail if a reducer happens to run on a node with insufficient space to hold
a map attempt's output.  The reducer keeps reporting the map attempt as bad, and if the map
attempt ends up being re-launched too many times before the reducer decides maybe it is the
real problem the job can fail.
> In that scenario it would be better to re-launch the reduce attempt and hopefully it
will run on another node that has sufficient space to complete the shuffle.  Reporting the
map attempt is bad and relaunching the map task doesn't change the fact that the reducer can't
hold the output.

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