[jira] Commented: (HADOOP-1521) Hadoop mapreduce should always ship the jar file(s) specified by the user

["Owen O'Malley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-1521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12507566 ] 

Owen O'Malley commented on HADOOP-1521:
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I don't understand what went wrong. Did the jar not exist? Was the representative class found in another jar? Applications can explicitly specify a jar file and that jar file WILL be used. Most applications use the method that sets the jar file based on a representative class. That can fail if the representative class is both in the "hadoop system" jars and the user's jar file.

> Hadoop  mapreduce should always ship the jar file(s) specified by the user
> --------------------------------------------------------------------------
>
>                 Key: HADOOP-1521
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1521
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Runping Qi
>
> when I run a hadoop job like:
>     bin/hadoop jar myjar org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorJob other_args
> myjar is not shipped. The job failed because the class loader cannot find the classes specified in myjar.

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