[jira] [Commented] (HADOOP-9450) HADOOP_USER_CLASSPATH_FIRST is not honored; CLASSPATH is PREpended instead of APpended

["Harsh J (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-9450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14366385#comment-14366385 ] 

Harsh J commented on HADOOP-9450:
---------------------------------

I think it is the right behaviour, as far as the ordering of classpath goes (which is its intention). Mitch's issue here was also with the HADOOP_CONF_DIR, which used to precede the user-set classpaths, and the behaviour is now changed to be truly "first".

> 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: Improvement
>          Components: scripts
>            Reporter: Mitch Wyle
>            Assignee: Harsh J
>             Fix For: 1-win, 2.1.0-beta, 1.3.0
>
>         Attachments: HADOOP-9450-branch-1-win.patch, HADOOP-9450-branch-1.patch, HADOOP-9450-branch-2.patch, HADOOP-9450.patch, 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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