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From Jianmin Woo <jianmin_...@yahoo.com>
Subject question about when shuffle/sort start working
Date Sat, 30 May 2009 04:30:19 GMT
I am being confused by the protocol between mapper and reducer. When mapper emitting the (key,value)
pair done, is there any signal the mapper send out to hadoop framework in protocol to indicate
that map is done and the shuffle/sort can begin for reducer? If there is no this signal in
protocol, when the framework begin the shuffle/sort?


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