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https://issues.apache.org/jira/browse/MAHOUT-1396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13871782#comment-13871782
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Suneel Marthi commented on MAHOUT-1396:
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Sean, I think we should be able to get this into 0.9 release. Since we have a
candidate 0.9 Release that's presently in staging do we need to roll that back
before any code can be committed for 0.9 into SVN? I think we should get this
and M-1394 into 0.9.
> Accidental use of commons-math won't work with next Hadoop 2 release
> --------------------------------------------------------------------
>
> Key: MAHOUT-1396
> URL: https://issues.apache.org/jira/browse/MAHOUT-1396
> Project: Mahout
> Issue Type: Bug
> Components: Classification
> Affects Versions: 0.8
> Reporter: Sean Owen
> Attachments: MAHOUT-1396.patch
>
>
> The project uses commons-math3, since about a year ago. However there is a
> use of old commons-math (2.2) lurking:
> core/src/main/java/org/apache/mahout/classifier/sgd/TPrior.java:
> import org.apache.commons.math.special.Gamma;
> This happens to have worked since commons-math has been pulled in by
> hadoop-common. But it no longer is in HEAD:
> http://svn.apache.org/viewvc/hadoop/common/trunk/hadoop-common-project/hadoop-common/pom.xml?view=markup
> So this will no longer compile against the latest Hadoop. I believe it will
> also not actually run again the latest Hadoop, even if one were to use a
> version compiled versus older Hadoop 2, since the class that uses it is used
> in the context of Writables -- that is, outside the client environment that
> might happen to have packaged commons-math -- and so would fail on the
> cluster.
> The change is trivial, to import the commons-math3 class. I've verified that
> tests pass and a patch is attached.
> Question is how much of a 'blocker' this should be for the pending release.
> It would cause it to stop working with the next Hadoop 2 release, so would be
> useful to get in, IMHO.
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