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

1. You want to count the number of occurrences for each unique word in the supplied input data. You've decided to implement this by having your mapper tokenize each word and emit a literal value 1, and then have your reducer increment a counter for each literal 1 it
receives. After successful implementing this, it occurs to you that you could optimize this by specifying a combiner. Will you be able to reuse your existing Reduces as your combiner in this case and why or why not?

A) No, because the Reducer and Combiner are separate interfaces.
B) Yes, because Java is a polymorphic object-oriented language and thus reducer code can be reused as a combiner.
C) No, because the sum operation in the reducer is incompatible with the operation of a Combiner.
D) No, because the Combiner is incompatible with a mapper which doesn't use the same data type for both the key and value.
E) Yes, because the sum operation is both associative and commutative and the input and output types to the reduce method match.

2. Which one of the following statements describes a Pig bag. tuple, and map, respectively?

A) Ordered collection of maps, ordered collection of bags, and unordered set of key/value pairs
B) Unordered collection of tuples, ordered set of fields, set of key value pairs
C) Unordered collection of maps, ordered collection of tuples, ordered set of key/value pairs
D) Ordered set of fields, ordered collection of tuples, ordered collection of maps

3. Given a directory of files with the following structure: line number, tab character, string:
Example:
1abialkjfjkaoasdfjksdlkjhqweroij
2kadfjhuwqounahagtnbvaswslmnbfgy
3kjfteiomndscxeqalkzhtopedkfsikj
You want to send each line as one record to your Mapper. Which InputFormat should you use to complete the line: conf.setInputFormat (____.class) ; ?

A) SequenceFileInputFormat
B) SequenceFileAsTextInputFormat
C) BDBInputFormat
D) KeyValueFileInputFormat

4. Given the following Pig commands:

Which one of the following statements is true?

A) The grouped relation is not valid
B) The $1 variable represents the second column of data in 'my.log'
C) The $1 variable represents the first column of data in 'my.log'
D) The severe relation is not valid

5. What is the term for the process of moving map outputs to the reducers?

A) Shuffling and sorting
B) Combining
C) Partitioning
D) Reducing

Solutions: