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https://issues.apache.org/jira/browse/HADOOP-9450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J updated HADOOP-9450:
----------------------------
Attachment: HADOOP-9450.patch
Mitch is correct about all of this. The intention was to place first or
regularly last, depending on the safety override. Relying on the position of
where it is done in code today is not maintainable nor reliable in the long
term (an example is trunk now, its got entries coming in before and after this
manipulation).
Note that the new Windows scripts already sorta do what Mitch points out rather
than emulate the existing implementation. FWIW, Pig also does the same thing
via PIG-3261.
I've attached a trunk applicable patch from what Mitch has posted in his
comments here. If this approach looks good to everyone, I can also supply a
branch-1 (and branch-2/0.23, if doesn't apply from trunk) compat patch to
backport.
I cannot test the Windows changes as I lack an environment presently but I did
manually inspect the CLASSPATH via a "bash -x ./hadoop" to see the precedence
switching doing its work properly.
> 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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