If some tasks on some workers take much 3. 8 points Ben Bitdiddle

Question 9 / 15:

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.

If some tasks on some workers take much longer than others to complete, and these “stragglers” are the bottleneck in the system, then allocating additional nodes to these straggler tasks will definitely improve performance.

A True

B False

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Explanation:

FALSE. Some straggler tasks may be slow because the amount of work they have to perform is large, not because they were assigned to a slow machine (which would be fixed by allocating additional nodes to the straggler tasks.)

Exam Home Page

https://www.jobilize.com/computer-system-engineering-exam-by-prof-samuel-madden-mit

Computer System Engineering 6.033 Spring 2006

Author:

Prof.Samuel MaddenProfessor

MIT Massachusetts Institute of Technology

USA

Access: Public Instant Grading

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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