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HADOOP - Explain the shuffle?




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asked SRVMTrainings November 11, 2012 02:18 AM  

Explain the shuffle?


           

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Reducer has 3 primary phases: shuffle, sort and reduce.
Shuffle
Input to the Reducer is the sorted output of the mappers. In this phase the framework fetches the relevant partition of the output of all the mappers, via HTTP.
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