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Hortonworks Hadoop 2.0 Certification exam for Pig and Hive Developer Sample Questions:

1. In a MapReduce job, the reducer receives all values associated with same key. Which statement best describes the ordering of these values?

A) Since the values come from mapper outputs, the reducers will receive contiguous sections of sorted values.
B) The values are arbitrary ordered, but multiple runs of the same MapReduce job will always have the same ordering.
C) The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce job.
D) The values are in sorted order.

2. 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= FOREACH A BY (gender = = 'M' AND zip = = '95102');
B) B = JOIN 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');

3. Given the following Pig command:
logevents = LOAD 'input/my.log' AS (date:chararray, levehstring, code:int, message:string);
Which one of the following statements is true?

A) The logevents relation represents the data from the my.log file, using a comma as the parsing delimiter
B) The statement is not a valid Pig command
C) The logevents relation represents the data from the my.log file, using a tab as the parsing delimiter
D) The first field of logevents must be a properly-formatted date string or table return an error

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

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

What is the output of the following Pig commands?
X = GROUP A BY S1; DUMP X;

A) Option C
B) Option B
C) Option A
D) Option D

Solutions: