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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9450) HADOOP_USER_CLASSPATH_FIRST is not honored; CLASSPATH is PREpended instead of APpended
Date Tue, 16 Apr 2013 07:11:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13632637#comment-13632637
] 

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

{quote}
-1 tests included. The patch doesn't appear to include any new or modified tests.
Please justify why no new tests are needed for this patch.
Also please list what manual steps were performed to verify this patch.
{quote}

Patch changes the script; no existing tests are present. Patch was tested by running in the
shell's debug mode (bash -x) for Linux by me to observe difference in built CLASSPATH based
on the HADOOP_USER_CLASSPATH_FIRST toggle and was also verified by Chris for behavior on Windows
manually.
                
> 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-branch-1.patch, HADOOP-9450-branch-1-win.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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