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

1. In the reducer, the MapReduce API provides you with an iterator over Writable values. What does calling the next () method return?

A) It returns a reference to the same Writable object each time, but populated with different data.
B) It returns a reference to the same Writable object if the next value is the same as the previous value, or a new Writable object otherwise.
C) It returns a reference to a Writable object from an object pool.
D) It returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.
E) It returns a reference to a different Writable object time.

2. 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 bigram of the top 80 sentences that contain the substring "you are" in the lines column of the input data A1 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 trigram of the top 80 sentences that contain "you are" followed by a null space in the lines column of the inputdata table.

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) KeyValueFileInputFormat
B) SequenceFileInputFormat
C) SequenceFileAsTextInputFormat
D) BDBInputFormat

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

5. Which one of the following is NOT a valid Oozie action?

A) pig
B) mrunit
C) mapreduce
D) hive

Solutions: