MapReduce Cloud Computing Question:

What is task granularity?

Answer:

In mapreduce the map phase if subdivided into M pieces and the reduce phase into R pieces. Each worker is assigned a group of tasks this improves dynamic load balancing and also speeds up the recovery of a worker in case of failures.


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What are the various input and output types supported by MapReduce?With the help of two examples name the map and reduce function purpose?