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