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https://issues.apache.org/jira/browse/HADOOP-1114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12487907
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Doug Cutting commented on HADOOP-1114:
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> We could package all the dependent code into the same jar, but that seems
> unnecessary.
Why is this unnecessary? That's the intended mechanism. Job jars may include
a lib/ directory with other jar files, just like a war file. Packaging things
this way makes it much easier to update your code without restarting Hadoop
daemons.
> 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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