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

1. 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) There is no difference in output between the two settings.
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) 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.

2. 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) BDBInputFormat
B) SequenceFileInputFormat
C) KeyValueFileInputFormat
D) SequenceFileAsTextInputFormat

3. Review the following 'data' file and Pig code.

Which one of the following statements is true?

A) The code executes successfully but there is not output because the D relation is empty
B) The output of the dump d command is (M, {(38,95in),(62,95i02)})
C) The code does not execute successfully because D is not a valid relation
D) The Output Of the DUMP D command IS (M,{(M,62.95102),(M,38,95111)})

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

5. 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 of heterogeneous writable objects.
D) 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.

Solutions: