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http://issues.apache.org/jira/browse/HADOOP-366?page=comments#action_12431526 ] 
            
Jean-Baptiste Quenot commented on HADOOP-366:
---------------------------------------------

James you're right, using a Manifest in the JAR is th standard way of doing 
this, thanks for reminding.  And about parameters, we could just pick the right 
config file in the JAR by passing a JVM argument:

  java -Dconfig=mybigcluster -jar mapred.jar

Or even using command-line arguments:

  java -jar mapred.jar mybigcluster

> Should be able to specify more than one jar into a JobConf file
> ---------------------------------------------------------------
>
>                 Key: HADOOP-366
>                 URL: http://issues.apache.org/jira/browse/HADOOP-366
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.4.0
>            Reporter: Thomas FRIOL
>
> A job should be able to specify more than one jar file into its JobConf file 
> because sometimes custom Map and Reduce classes or just InputFormat classes 
> uses objects coming from other jar files. For now, we have to build a unique 
> jar to make Hadoop mapreduce operations works.

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