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Welcome to the MapReduce Development and Features MCQs Page

Dive deep into the fascinating world of MapReduce Development and Features with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of MapReduce Development and Features, a crucial aspect of Hadoop. In this section, you will encounter a diverse range of MCQs that cover various aspects of MapReduce Development and Features, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Hadoop.

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Check out the MCQs below to embark on an enriching journey through MapReduce Development and Features. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Hadoop.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of MapReduce Development and Features. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

MapReduce Development and Features MCQs | Page 9 of 11

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Q81.
Point out the correct statement.

a.

You can add a column family to a table using the method addColumn()

b.

Using alter, you can also create a column family

c.

Using disable-all, you can truncate a column family

d.

None of the mentioned

Discuss
Answer: (a).You can add a column family to a table using the method addColumn()
Q82.
Point out the wrong statement.

a.

To read data from an HBase table, use the get() method of the HTable class

b.

You can retrieve data from the HBase table using the get() method of the HTable class

c.

While retrieving data, you can get a single row by id, or get a set of rows by a set of row ids, or scan an entire table or a subset of rows

d.

None of the mentioned

Discuss
Answer: (d).None of the mentioned
Q83.
Point out the correct statement.

a.

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

b.

Applications typically implement the Mapper and Reducer interfaces to provide the map and reduce methods

c.

Mapper and Reducer interfaces form the core of the job

d.

None of the mentioned

Discuss
Answer: (d).None of the mentioned
Q84.
Point out the wrong statement.

a.

The Mapper outputs are sorted and then partitioned per Reducer

b.

The total number of partitions is the same as the number of reduce tasks for the job

c.

The intermediate, sorted outputs are always stored in a simple (key-len, key, value-len, value) format

d.

None of the mentioned

Discuss
Answer: (d).None of the mentioned
Q85.
Point out the correct statement.

a.

The right number of reduces seems to be 0.95 or 1.75

b.

Increasing the number of reduces increases the framework overhead

c.

With 0.95 all of the reduces can launch immediately and start transferring map outputs as the maps finish

d.

All of the mentioned

Discuss
Answer: (c).With 0.95 all of the reduces can launch immediately and start transferring map outputs as the maps finish
Q86.
Point out the wrong statement.

a.

It is legal to set the number of reduce-tasks to zero if no reduction is desired

b.

The outputs of the map-tasks go directly to the FileSystem

c.

The Mapreduce framework does not sort the map-outputs before writing them out to the FileSystem

d.

None of the mentioned

Discuss
Answer: (d).None of the mentioned
Q87.
Point out the correct statement.

a.

The number of sorted map outputs fetched into memory before being merged to disk

b.

The memory threshold for fetched map outputs before an in-memory merge is finished

c.

The percentage of memory relative to the maximum heap size in which map outputs may not be retained during the reduce

d.

None of the mentioned

Discuss
Answer: (a).The number of sorted map outputs fetched into memory before being merged to disk
Q88.
Point out the wrong statement.

a.

The task tracker has local directory to create localized cache and localized job

b.

The task tracker can define multiple local directories

c.

The Job tracker cannot define multiple local directories

d.

None of the mentioned

Discuss
Answer: (d).None of the mentioned
Q89.
Point out the correct statement.

a.

Configuration parameters may be declared static

b.

Unless explicitly turned off, Hadoop by default specifies two resources

c.

Configuration class provides access to configuration parameters

d.

None of the mentioned

Discuss
Answer: (a).Configuration parameters may be declared static
Q90.
Point out the wrong statement.

a.

addDeprecations adds a set of deprecated keys to the global deprecations

b.

configuration parameters cannot be declared final

c.

addDeprecations method is lockless

d.

none of the mentioned

Discuss
Answer: (b).configuration parameters cannot be declared final
Page 9 of 11

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