Question

In Hadoop MapReduce, when is the output of the reduce() function written to the distributed file system?

a.

After reading the entire input data

b.

During the copy phase

c.

After merging temporary files

d.

As soon as the reduce task starts

Posted under Big Data Computing

Answer: (d).As soon as the reduce task starts Explanation:In Hadoop MapReduce, the output of the reduce() function is written to the distributed file system as soon as the reduce task starts.

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Q. In Hadoop MapReduce, when is the output of the reduce() function written to the distributed file system?

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