ReflectionUtils.setConf would configure the KeyFieldBasedPartitioner twice in 
Hadoop 0.21.0, when KeyFieldBasedPartitioner is an Configurable instance
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                 Key: HADOOP-7425
                 URL: https://issues.apache.org/jira/browse/HADOOP-7425
             Project: Hadoop Common
          Issue Type: Bug
          Components: util
    Affects Versions: 0.21.0
            Reporter: steven zhuang


In  the setConf method of org.apache.hadoop.util.ReflectionUtils, any instance 
of Configurable would be configured twice.
In 0.21.0, KeyFieldBasedPartitioner implements the Configurable interface. When 
configured twice, it get two KeyDescription and gives out wrong partition 
number. 


public static void setConf(Object theObject, Configuration conf) {
    if (conf != null) {
      if (theObject instanceof Configurable) {
        ((Configurable) theObject).setConf(conf);
      }
      setJobConf(theObject, conf);
    }
  }


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