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Posted to common-issues@hadoop.apache.org by "Mitch Wyle (JIRA)" <ji...@apache.org> on 2013/04/02 02:01:15 UTC

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

Mitch Wyle created HADOOP-9450:
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             Summary: 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


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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