HADOOP-PR000007 Exam Training Practice Tests (Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer))]

Question 1

You want to run Hadoop jobs on your development workstation for testing before you submit them to your
production cluster. Which mode of operation in Hadoop allows you to most closely simulate a production
cluster while using a single machine?

A. Run all the nodes in your production cluster as virtual machines on your development workstation. B. Run the hadoop command with the -jt local and the -fs file:///options. C. Run the DataNode, TaskTracker, NameNode and JobTracker daemons on a single machine. D. Run simldooop, the Apache open-source software for simulating Hadoop clusters.

Correct Answer: C

Question 2

What is a SequenceFile?

A. A SequenceFile contains a binary encoding of an arbitrary number of WritableComparable objects, in
sorted order. B. A SequenceFile contains a binary encoding of an arbitrary number of homogeneous writable objects. C. A SequenceFile contains a binary encoding of an arbitrary number key-value pairs. Each key must be
the same type. Each value must be same type. D. A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous writable objects.

Correct Answer: C

Question 3

MapReduce v2 (MRv2/YARN) is designed to address which two issues?

A. HDFS latency. B. Standardize on a single MapReduce API. C. Resource pressure on the JobTracker. D. Reduce complexity of the MapReduce APIs. E. Ability to run frameworks other than MapReduce, such as MPI. F. Single point of failure in the NameNode.

Correct Answer: C,F

Question 4

Review the following data and Pig code:

What command to define B would produce the output (M,62,95l02) when invoking the DUMP operator on
B?

A. B = JOIN A BY (gender = = 'M' AND zip = = '95102'); B. B= FOREACH A BY (gender = = 'M' AND zip = = '95102'); C. B = FILTER A BY (zip = = '95102' AND gender = = M"); D. B= GROUP A BY (zip = = '95102' AND gender = = 'M');

Correct Answer: C

Question 5

Assuming the following Hive query executes successfully:

Which one of the following statements describes the result set?

A. A frequency distribution of the top 80 words that follow the subsequence "you are" in the lines column
of the inputdata table. B. A trigram of the top 80 sentences that contain "you are" followed by a null space in the lines column of
the inputdata table. C. An 80-value ngram of sentences that contain the words "you" or "are" in the lines column of the
inputdata table. D. A bigram of the top 80 sentences that contain the substring "you are" in the lines column of the input
data A1 table.

Correct Answer: A

Question 6

You have a directory named jobdata in HDFS that contains four files: _first.txt, second.txt, .third.txt and
# data.txt. How many files will be processed by the FileInputFormat.setInputPaths () command when it's
given a path object representing this directory?

A. Four, all files will be processed B. None, the directory cannot be named jobdata C. Three, the pound sign is an invalid character for HDFS file names D. One, no special characters can prefix the name of an input file E. Two, file names with a leading period or underscore are ignored

Correct Answer: E

Question 7

Which Hadoop component is responsible for managing the distributed file system metadata?

A. DataNode B. NameSpaceManager C. Metanode D. NameNode

Correct Answer: D

Question 8

In a large MapReduce job with m mappers and n reducers, how many distinct copy operations will there
be in the sort/shuffle phase?

A. m+n (i.e., m plus n) B. m C. mn (i.e., m to the power of n) D. mXn (i.e., m multiplied by n) E. n

Correct Answer: D

Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) - HADOOP-PR000007 Exam Practice Test