MapReduce Programming Model MCQ question and answer with solution

61

Point out the wrong statement.

A) A MapReduce job usually splits the input data-set into independent chunks which are processed by the map tasks in a completely parallel manner B) The MapReduce framework operates exclusively on <key, value> pairs C) Applications typically implement the Mapper and Reducer interfaces to provide the map and reduce methods D) None of the mentioned

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Answer & Solution

Answer: Option D

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62

. . . . . . . . is the primary interface for a user to describe a MapReduce job to the Hadoop framework for execution.

A) Map Parameters B) JobConf C) MemoryConf D) None of the mentioned

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Answer & Solution

Answer: Option B

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63

Which of the following Hadoop streaming command option parameter is required?

A) output directoryname B) mapper executable C) input directoryname D) all of the mentioned

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Answer: Option D

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64

. . . . . . . . maps input key/value pairs to a set of intermediate key/value pairs.

A) Mapper B) Reducer C) Both Mapper and Reducer D) None of the mentioned

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Answer: Option A

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65

Hadoop has a library class, org.apache.hadoop.mapred.lib.FieldSelectionMapReduce, that effectively allows you to process text data like the unix . . . . . . . . utility.

A) Copy B) Cut C) Paste D) Move

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Answer: Option B

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66

Point out the correct statement.

A) Applications can use the Reporter to report progress B) The Hadoop MapReduce framework spawns one map task for each InputSplit generated by the InputFormat for the job C) The intermediate, sorted outputs are always stored in a simple (key-len, key, value-len, value) format D) All of the mentioned

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Answer: Option D

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67

The . . . . . . . . can also be used to distribute both jars and native libraries for use in the map and/or reduce tasks.

A) DataCache B) DistributedData C) DistributedCache D) All of the mentioned

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Answer: Option C

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68

To set an environment variable in a streaming command use . . . . . . . .

A) -cmden EXAMPLE_DIR=/home/example/dictionaries/ B) -cmdev EXAMPLE_DIR=/home/example/dictionaries/ C) -cmdenv EXAMPLE_DIR=/home/example/dictionaries/ D) -cmenv EXAMPLE_DIR=/home/example/dictionaries/

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Answer: Option C

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69

Streaming supports streaming command options as well as . . . . . . . . command options.

A) generic B) tool C) library D) task

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Answer: Option A

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70

. . . . . . . . is a generalization of the facility provided by the MapReduce framework to collect data output by the Mapper or the Reducer.

A) Partitioner B) OutputCollector C) Reporter D) All of the mentioned

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Answer & Solution

Answer: Option B

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MapReduce Programming Model MCQ question and answer with solution | Hadoop MCQs