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https://issues.apache.org/jira/browse/MAHOUT-537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044015#comment-13044015
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Dmitriy Lyubimov commented on MAHOUT-537:
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bq. Does 0.21 bring back map-side joins and multiple outputs? We don't use 0.21
in production at Twitter, and I know tons of other places who haven't migrated
up yet either.
Yes i beleive it does but not in a quite compatible way with old spec and they
are not in CDH.
They also dropped some support for good i think (such as MultipleOutputFormat)
and incorporated these capabilities into MultipleOutputs which makes some code
upgrades a little bit more intensive than simple class name change.
> Bring DistributedRowMatrix into compliance with Hadoop 0.20.2
> -------------------------------------------------------------
>
> Key: MAHOUT-537
> URL: https://issues.apache.org/jira/browse/MAHOUT-537
> Project: Mahout
> Issue Type: Improvement
> Components: Math
> Affects Versions: 0.4, 0.5
> Reporter: Shannon Quinn
> Assignee: Shannon Quinn
> Fix For: 0.6
>
> Attachments: MAHOUT-537.patch, MAHOUT-537.patch, MAHOUT-537.patch,
> MAHOUT-537.patch
>
>
> Convert the current DistributedRowMatrix to use the newer Hadoop 0.20.2 API,
> in particular eliminate dependence on the deprecated JobConf, using instead
> the separate Job and Configuration objects.
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