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HADOOP - What is the use of Combiner?




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asked SRVMTrainings November 8, 2012 02:43 AM  

What is the use of Combiner?


           

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answered By Akshay Singh   0  
This answer is pending moderator approval Combiner acts as mini reducer.The number of combiner is same as the number of reducer.

It improves the performance.
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answered By   0  
Combiner acts as a mini reducer on the mapper side. combiner is used for reducing the load for the reducer. Combiner can be written individually or with in the mapper program. combiner will run once if it is within the mapper program otherwise many times can be executed.
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Asked 5 years and 2 months ago ago
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