• Card 12 / 19: 3. [8 points]: Ben Bitdiddle is using a MapReduce cluster (as described in reading #8) to process some data. He finds that some of his programs are running slowly and needs your help to understand which performance enhancements to try. For each of the following MapReduce configurations and suggested enhancements, circle True if the statement about the enhancement is true, and False otherwise. the entire 1000-node cluster can complete these MapReduce operations in 100 seconds then doubling the CPU performance (task processing rate) of each machine in the cluster may improve performance somewhat but not significantly.Assume that there are 1000 machines, 1000 map tasks and 100 reduce tasks, and that the CPU processing time for each map or reduce task to execute on a single machine is 1 second. If
    A) True
    B) False

    Answer:
    A) True

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Explanation:

TRUE. Performance will not increase much since the 1100 tasks can be completed in about 1.1 seconds by the current 1000 node cluster, so halving this (to .55 seconds) won’t help the overall 100 second runtime very significantly.

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Computer System Engineering 6.033 Spring 2006

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Attribution:  Morris, Robert, and Samuel Madden. 6.033 Computer System Engineering, Spring 2009. (MIT OpenCourseWare: Massachusetts Institute of Technology), http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-033-computer-system-engineering-spring-2009 (Accessed 2 May, 2014). License: Creative Commons BY-NC-SA
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