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https://issues.apache.org/jira/browse/MAPREDUCE-1521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13000141#comment-13000141
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Hadoop QA commented on MAPREDUCE-1521:
--------------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12471049/resourcestimator-overflow.txt
against trunk revision 1075216.
+1 @author. The patch does not contain any @author tags.
-1 tests included. The patch doesn't appear to include any new or modified
tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
-1 patch. The patch command could not apply the patch.
Console output:
https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/86//console
This message is automatically generated.
> Protection against incorrectly configured reduces
> -------------------------------------------------
>
> Key: MAPREDUCE-1521
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1521
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobtracker
> Reporter: Arun C Murthy
> Assignee: Mahadev konar
> Priority: Critical
> Fix For: 0.22.0
>
> Attachments: MAPREDUCE-1521-0.20-yahoo.patch,
> MAPREDUCE-1521-0.20-yahoo.patch, MAPREDUCE-1521-0.20-yahoo.patch,
> MAPREDUCE-1521-0.20-yahoo.patch, MAPREDUCE-1521-0.20-yahoo.patch,
> MAPREDUCE-1521-trunk.patch, resourceestimator-threshold.txt,
> resourcestimator-overflow.txt
>
>
> We've seen a fair number of instances where naive users process huge
> data-sets (>10TB) with badly mis-configured #reduces e.g. 1 reduce.
> This is a significant problem on large clusters since it takes each attempt
> of the reduce a long time to shuffle and then run into problems such as local
> disk-space etc. Then it takes 4 such attempts.
> Proposal: Come up with heuristics/configs to fail such jobs early.
> Thoughts?
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