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Hadoop, mail # user - Grouping comparator


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Grouping comparator
Ajay Srivastava 2012-06-04, 10:56
Hi,

Can someone please explain default implementation of grouping comparator i.e. if I do not specify a custom grouping comparator then which comparator is called to decide the grouping for reducer.
I searched a lot on web but could not find a satisfactory explanation for its default implementation.
Regards,
Ajay Srivastava