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From "Michael Bieniosek (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1114) bin/hadoop script clobbers CLASSPATH
Date Tue, 10 Apr 2007 18:05:33 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12487857
] 

Michael Bieniosek commented on HADOOP-1114:
-------------------------------------------

Currently, the hadoop runjar commands takes a single user jar as argument.  However, our jar
depends on other (custom) java libraries.  So we get around this by this CLASSPATH hack. 
We could drop dependent jars into the hadoop lib file, but I'd rather not mix shipped hadoop
code with our user code.

We could package all the dependent code into the same jar, but that seems unnecessary.  A
better alternative might be to set a CLASSPATH in the jar manifest, but I haven't thought
very much about how that would work.

So unless there is another better yet simple method, we need some way to insert jar dependencies
into hadoop.  Your example of Tomcat is a bit different, since there is a well-defined mechanism
for getting dependent jars into servlet containers (using the WEB-INF/lib directory). 

It doesn't seem very worthwhile to rename CLASSPATH to HADOOP_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
>             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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