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https://issues.apache.org/jira/browse/HADOOP-1114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12487930
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Doug Cutting commented on HADOOP-1114:
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> I accept that using CLASSPATH for dependencies is fragile and hacky, I'm not
> sure why HADOOP_CLASSPATH is any different.
It's a bit less fragile, since it won't conflict with every other Java
application in the world, only with other Hadoop-based applications. That's
all. For example, I've seen Windows installers that set CLASSPATH to include
lots of stuff that we wouldn't want on Hadoop's class path.
> 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
> Fix For: 0.13.0
>
> 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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