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https://issues.apache.org/jira/browse/MAHOUT-368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854429#action_12854429
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Robin Anil commented on MAHOUT-368:
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check out the mahout-examples.job in examples/target its the jar file you need
> should package core ,math and collections to one Jar package for hadoop
> recommendations
> ---------------------------------------------------------------------------------------
>
> Key: MAHOUT-368
> URL: https://issues.apache.org/jira/browse/MAHOUT-368
> Project: Mahout
> Issue Type: Improvement
> Components: Collaborative Filtering
> Affects Versions: 0.4
> Reporter: Hui Wen Han
> Fix For: 0.4
>
>
> should package core ,math and collections to one Jar package for
> org.apache.mahout.cf.taste.hadoop.item.RecommenderJob.
> because RecommenderJob used classes (for example
> org.apache.mahout.math.VectorWritable )of the math module of mahout project,
> but math and core module is the separated jar package.
> so when work on the hadoop env ,the class of math module can not load to
> classloader in the datanode.
> it will cause class not found exception.
> the work around is package all mahout classes to one package manually.
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