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Posted to common-issues@hadoop.apache.org by "Mitch Wyle (JIRA)" <ji...@apache.org> on 2013/04/02 02:37:17 UTC
[jira] [Commented] (HADOOP-9450) HADOOP_USER_CLASSPATH_FIRST is not
honored; CLASSPATH is PREpended instead of APpended
[ https://issues.apache.org/jira/browse/HADOOP-9450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13619375#comment-13619375 ]
Mitch Wyle commented on HADOOP-9450:
------------------------------------
48a49,53
> # HADOOP_USER_CLASSPATH_FIRST_REALLY Fixes HADOOP-9450 - when set,
> # HADOOP_CLASSPATH is pre-pended
> # instead of added to the end of
> # CLASSPATH
> #
133c138,142
< CLASSPATH=${CLASSPATH}:${HADOOP_CLASSPATH}
---
> if [ "HADOOP_USER_CLASSPATH_FIRST_REALLY" != "" ]; then
> CLASSPATH=${HADOOP_CLASSPATH}:${CLASSPATH}
> else
> CLASSPATH=${CLASSPATH}:${HADOOP_CLASSPATH}
> fi
> 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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