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https://issues.apache.org/jira/browse/HADOOP-1114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12487171
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Tom White commented on HADOOP-1114:
-----------------------------------

Should this check to see if CLASSPATH has been previously set before including 
it in the new CLASSPATH? 

> bin/hadoop script clobbers CLASSPATH
> ------------------------------------
>
>                 Key: HADOOP-1114
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1114
>             Project: Hadoop
>          Issue Type: Bug
>          Components: scripts
>    Affects Versions: 0.12.0
>            Reporter: Michael Bieniosek
>            Priority: Minor
>         Attachments: hadoop-no-clobber-classpath.patch
>
>
> The bin/hadoop script distributed with hadoop clobbers the user's CLASSPATH.  
> This prevents ad-hoc appending to the CLASSPATH.

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