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https://issues.apache.org/jira/browse/MAHOUT-994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13235871#comment-13235871
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Dmitriy Lyubimov commented on MAHOUT-994:
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I am not sure we use hadoop executable to launch Mahout stuff. there are 
definitely cases where we don't use Hadoop at all (but the code generally does 
assume hadoop library avaiability on classpath, otherwise some classes and 
strategies may break with ClassNotFoundException during load). 

What is your suggestion to handle "hadoopless" cases and avoid ClassNotFound?
                
> mahout script shouldn't rely on HADOOP_HOME since that was deprecated in all 
> major Hadoop branches
> --------------------------------------------------------------------------------------------------
>
>                 Key: MAHOUT-994
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-994
>             Project: Mahout
>          Issue Type: Bug
>          Components: Integration
>    Affects Versions: 0.6
>            Reporter: Roman Shaposhnik
>
> Mahout should follow the Pig and Hive example and not rely explicitly on 
> HADOOP_HOME and HADOOP_CONF_DIR

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