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MapReduce, mail # user - Including third party jar files in Map Reduce job

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RE: Including third party jar files in Map Reduce job
Devaraj k 2012-04-04, 07:04
Hi Utkarsh,

The usage of the jar command is like this,

Usage: hadoop jar <jar> [mainClass] args...

If you want the commons-math3.jar to be available for all the tasks you can do any one of these 1. Copy the jar file in $HADOOP_HOME/lib dir or 2. Use the generic option -libjars.

Can you give the stack trace of your problem for which class it is giving ClassNotFoundException(i.e for main class or math lib class)?

From: Utkarsh Gupta [[EMAIL PROTECTED]]
Sent: Wednesday, April 04, 2012 12:22 PM
Subject: Including third party jar files in Map Reduce job

Hi All,

I am new to Hadoop and was trying to generate random numbers using apache commons math library.
I used Netbeans to build the jar file and the manifest has path to commons-math jar as lib/commons-math3.jar
I have placed this jar file in HADOOP_HOME/lib folder but still I am getting ClassNotFoundException.
I tried using –libjar option with $HADOOP_HOME/bin/Hadoop jar myprg.jar <inputpath> <outputpath> –libjar <jarpath>
And $HADOOP_HOME/bin/Hadoop jar myprg.jar –libjar <jarpath> <inputpath> <outputpath>
But this is not working. Please help.
Thanks and Regards
Utkarsh Gupta

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