The method setGroupingComparatorClass in the Java class org.apache.hadoop.mapreduce.Job is used to set the user-defined grouping comparator class for a MapReduce job in the Hadoop framework. The grouping comparator class is responsible for determining how the intermediate keys generated by the map phase are grouped before being passed to the reduce phase. By setting this class, the user can customize the way the keys are grouped based on their specific requirements.
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