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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8899) Classpath exceeds maximum OS limit
Date Tue, 09 Oct 2012 16:18:03 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13472507#comment-13472507
] 

Alejandro Abdelnur commented on HADOOP-8899:
--------------------------------------------

The potential downside of my suggested approach is that you lose the capability to order JARs
in the classpath as '*' will be resolved in system specific way (I've seen this being done
differently in different unix versions); which in my opinion should not be an issue as you
should not have duplicate JARs in your classpath to start. The other downside is that you
won't, from the logs, know exactly what is in the classpath, you'll only see a 'distributedcache-lib/*'
entry in the classpath.
                
> Classpath exceeds maximum OS limit
> ----------------------------------
>
>                 Key: HADOOP-8899
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8899
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 1-win
>            Reporter: Ahmed El Baz
>
> We hit errors in TT due to long classpath value. One example is Oozie trying to start
a hive job, and it fails with the following error:
>  java.io.IOException: Command exceeds the OS command length limit: 8192, command: "set
CLASSPATH="….
> The classpath includes Hadoop Core + Hive Jars which are in the distributed cache. This
is causing the classpath to be too long giving the error above. A viable long term fix is
to generate a temporary JAR file in the task cache directory which includes all elements in
the long classpath, and then provide this as the "-classpath" argument for the JVM to be spawned.
This is gated for Windows only.

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