PrepAway - Latest Free Exam Questions & Answers

Does the MapReduce programming model provide a way for reducers to communicate with each other?

Does the MapReduce programming model provide a way for reducers to communicate with each
other?

PrepAway - Latest Free Exam Questions & Answers

A.
Yes, all reducers can communicate with each other by passing information through the jobconf
object.

B.
Yes, reducers can communicate with each other by dispatching intermediate key value pairs
that get shuffled to another reduce

C.
Yes, reducers running on the same machine can communicate with each other through shared
memory, but not reducers on different machines.

D.
No, each reducer runs independently and in isolation.

Explanation:
MapReduce programming model does not allow reducers to communicate with each
other. Reducers run in isolation.
Reference:24 Interview Questions & Answers for Hadoop MapReduce developers
http://www.fromdev.com/2010/12/interview-questions-hadoop-mapreduce.html(See question no.
9)

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