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

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

2. You wrote a map function that throws a runtime exception when it encounters a control character in input data. The input supplied to your mapper contains twelve such characters totals, spread across five file splits. The first four file splits each have two control characters and the last split has four control characters.
Indentify the number of failed task attempts you can expect when you run the job with mapred.max.map.attempts set to 4:

A) You will have forty-eight failed task attempts
B) You will have five failed task attempts
C) You will have twelve failed task attempts
D) You will have twenty failed task attempts
E) You will have seventeen failed task attempts

3. To use a lava user-defined function (UDF) with Pig what must you do?

A) Define an alias to shorten the function name
B) Put the JAR file into the user's home folder in HDFS
C) Register the JAR file containing the UDF
D) Pass arguments to the constructor of UDFs implementation class

4. How are keys and values presented and passed to the reducers during a standard sort and shuffle phase of MapReduce?

A) Keys are presented to a reducer in random order; values for a given key are sorted in ascending order.
B) Keys are presented to a reducer in random order; values for a given key are not sorted.
C) Keys are presented to reducer in sorted order; values for a given key are not sorted.
D) Keys are presented to reducer in sorted order; values for a given key are sorted in ascending order.

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

Solutions: