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Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) Sample Questions:

1. Consider the following two relations, A and B.

A Pig JOIN statement that combined relations A by its first field and B by its second field would produce
what output?

A) 2 Jim Chris 2 3 Terry 3 4 Brian 4
B) 2 cherry Jim 2 2 cherry Chris 2 3 orange Terry 3 4 peach Brian 4
C) 2 cherry 2 cherry 3 orange 4 peach
D) 2 cherry Jim, Chris 3 orange Terry 4 peach Brian

2. You write MapReduce job to process 100 files in HDFS. Your MapReduce algorithm uses
TextInputFormat: the mapper applies a regular expression over input values and emits key-values pairs
with the key consisting of the matching text, and the value containing the filename and byte offset.
Determine the difference between setting the number of reduces to one and settings the number of
reducers to zero.

A) With zero reducers, instances of matching patterns are stored in multiple files on HDFS. With one
reducer, all instances of matching patterns are gathered together in one file on HDFS.
B) With zero reducers, all instances of matching patterns are gathered together in one file on HDFS. With
one reducer, instances of matching patterns are stored in multiple files on HDFS.
C) With zero reducers, no reducer runs and the job throws an exception. With one reducer, instances of
matching patterns are stored in a single file on HDFS.
D) There is no difference in output between the two settings.

3. Assuming the following Hive query executes successfully:

Which one of the following statements describes the result set?

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

4. What are the TWO main components of the YARN ResourceManager process? Choose 2 answers

A) Job Tracker
B) Task Tracker
C) Scheduler
D) Applications Manager

5. Examine the following Hive statements:

Assuming the statements above execute successfully, which one of the following statements is true?

A) The output is guaranteed to be a single file with all the data sorted by age
B) The SORT BY command causes only one reducer to be used
C) Each reducer generates a file sorted by age
D) The output of each reducer is only the age column

Solutions: