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https://issues.apache.org/jira/browse/MAHOUT-708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13037463#comment-13037463
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Ted Dunning commented on MAHOUT-708:
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Frankly, I think that the next version of Hadoop that provides any compelling
features for large enterprises is likely to be 0.23 where MR nextgen comes into
play. Ironically, the major reason that version will be exciting is that it
allows for compatibility with old API's. The ability to have old and new
side-by-side is a pre-requisite for any large cluster upgrade.
> Update to Hadoop 0.21
> ---------------------
>
> Key: MAHOUT-708
> URL: https://issues.apache.org/jira/browse/MAHOUT-708
> Project: Mahout
> Issue Type: Task
> Components: Classification, Clustering, Collaborative Filtering,
> Frequent Itemset/Association Rule Mining
> Affects Versions: 0.5
> Reporter: Sean Owen
> Assignee: Sean Owen
> Labels: hadoop
> Fix For: 0.6
>
>
> I suggest we should move to Hadoop 0.21 for the next release. It is the
> current release, soon to be superseded by 0.22. It matches more closely what
> CDH3/4 users use. It has bug fixes, and crucially some features that make
> joins much less painful.
> The drawback is that EMR does not yet support it. I still suggest we forge
> ahead as one imagines it will be supported by the time we release 0.6.
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