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https://issues.apache.org/jira/browse/HADOOP-9450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13630965#comment-13630965
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Chris Nauroth commented on HADOOP-9450:
---------------------------------------

Thanks, Harsh.  The patch looks good to me.  There is a slight change in 
behavior in that HADOOP_CONF_DIR is no longer guaranteed to be first, but we 
can get the same effect by putting that at the front of the value for 
HADOOP_CLASSPATH, so it seems fine.

I can volunteer to test the patch on Windows.  I'll comment again as soon as I 
get a chance to test.
                
> HADOOP_USER_CLASSPATH_FIRST is not honored; CLASSPATH is PREpended instead of 
> APpended
> --------------------------------------------------------------------------------------
>
>                 Key: HADOOP-9450
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9450
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Mitch Wyle
>         Attachments: HADOOP-9450.patch
>
>
> On line 133 of the hadoop shell wrapper, CLASSPATH is set as:
> CLASSPATH=${CLASSPATH}:${HADOOP_CLASSPATH}
> Notice that the built-up CLASSPATH, along with all the libs and unwanted JARS 
> are pre-pended BEFORE the user's HADOOP_CLASSPATH.  Therefore there is no way 
> to put your own JARs in front of those that the hadoop wrapper script sets.
> We propose a patch that reverses this order.  Failing that, we would like to 
> add a command line option to override this behavior and enable a user's JARs 
> to be found before the wrong ones in the Hadoop library paths.
> We always welcome your opinions.

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