Zhijie Shen created MAPREDUCE-5160:
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             Summary: Aggregatewordcount and aggregatewordhist in hadoop-1 
examples can not find their inner classes when running on Yarn
                 Key: MAPREDUCE-5160
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5160
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Zhijie Shen
            Assignee: Zhijie Shen


Aggregatewordcount and Aggregatewordhist of hadoop-1 cannot run on hadoop-2 due 
to 
org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorJob.createValueAggregatorJob(String
 args[], Class<?> caller) is not available on hadoop-2 (see MAPREDUCE-5159).

After I changed Aggregatewordcount and Aggregatewordhist to use 
createValueAggregatorJob(String args[], Class<? extends 
ValueAggregatorDescriptor>[] descriptors), which is available on hadoop-2, the 
two examples could be accepted and run on Yarn.

However, the two examples still failed, because their inner classes, 
WordCountPlugInClass and AggregateWordHistogramPlugin, cannot be found in 
runtime, respectively. Both the plugin classes extend 
org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorBaseDescriptor.

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