CCD-333 by Cloudera Actual Free Exam Questions And Answers

Question 1

Which MapReduce daemon runs on each slave node and participates in job execution?

A. TaskTracker

B. Secondary NameNode

C. JobTracker

D. NameNode

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Correct Answer: A Vote an answer

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Question 2

For each input key-value pair, mappers can emit:

A. As many intermediate key value pairs as desired, as long as all the keys have the same type and all the values have the same type.

B. One intermediate key value pair, but of the same type.

C. As many intermediate key-value pairs as desired, but they cannot be of the same type as the input key-value pair.

D. As many intermediate key-value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).

E. One intermediate key value pair, of a different type.

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Correct Answer: D Vote an answer

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Question 3

Combiners Increase the efficiency of a MapReduce program because:

A. They aggregate intermediate map output locally on each individual machine and therefore reduce the amount of data that needs to be shuffled across the network to the reducers.

B. They aggregate intermediate map output horn a small number of nearby (i.e., rack-local) machines and therefore reduce the amount of data that needs to be shuffled across the network to the reducers.

C. They provide a mechanism for different mappers to communicate with each Other, thereby reducing synchronization overhead.

D. They provide an optimization and reduce the total number of computations that are needed to execute an algorithm by a factor of n, where is the number of reducer.

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Correct Answer: A Vote an answer

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Question 4

Can you use MapReduce to perform a relational join on two large tables sharing a key? Assume that the two tables are formatted as comma-separated file in HDFS.

A. Yes, so long as both tables fit into memory.

B. Yes.

C. Yes, but only if one of the tables fits into memory.

D. No, MapReduce cannot perform relational operations.

E. No, but it can be done with either Pig or Hive.

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Correct Answer: B Vote an answer

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Question 5

You are running a job that will process a single InputSplit on a cluster which has no other jobs currently running. Each node has an equal number of open Map slots. On which node will Hadoop first attempt to run the Map task?

A. The node with the most memory

B. The node with the most free local disk space

C. The node on which this InputSplit is stored

D. The node with the lowest system load

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Correct Answer: C Vote an answer

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Question 6

If you run the word count MapReduce program with m mappers and r reducers, how many output files will you get at the end of the job? And how many key-value pairs will there be in each file? Assume k is the number of unique words in the input files.

A. There will be m files, each with approximately k/m key-value pairs.

B. There will be m files, each with exactly k/m key value pairs.

C. There will be r files, each with approximately k/m key-value pairs.

D. There will be r files, each with exactly k/r key-value pairs.

E. There will be r files, each with approximately k/r key-value pairs.

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Correct Answer: D Vote an answer

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Cloudera Certified Developer for Apache Hadoop - CCD-333 Exam Practice Test

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