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Parallelism





Parallelism can be incorporated by having multiple reducers.
The number of reducers can be set explicitly using parallel keyword.
The number of mappers depends up on the number of input splits.


- See more at: http://labstrikes.blogspot.in/2012/08/adsense-middle-blog-post.html#sthash.gQgSkqx8.dpuf
 
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