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

2. Which one of the following statements is false about HCatalog?

A) Designed to be used by other programs such as Pig, Hive and MapReduce
B) Stores HDFS data in a database for performing SQL-like ad-hoc queries
C) Provides a shared schema mechanism
D) Exists as a subproject of Hive

3. You have written a Mapper which invokes the following five calls to the OutputColletor.collect method:
output.collect (new Text ("Apple"), new Text ("Red") ) ;
output.collect (new Text ("Banana"), new Text ("Yellow") ) ;
output.collect (new Text ("Apple"), new Text ("Yellow") ) ;
output.collect (new Text ("Cherry"), new Text ("Red") ) ;
output.collect (new Text ("Apple"), new Text ("Green") ) ;
How many times will the Reducer's reduce method be invoked?

A) 3
B) 0
C) 5
D) 1
E) 6

4. Given the following Hive command:
INSERT OVERWRITE TABLE mytable SELECT * FROM myothertable;
Which one of the following statements is true?

A) A new table named mytable is created, and the contents of myothertable are copied into mytable
B) The contents of myothertable are appended to mytable
C) The statement is not a valid Hive command
D) Any existing data in mytable will be overwritten

5. What data does a Reducer reduce method process?

A) All data for a given key, regardless of which mapper(s) produced it.
B) All the data in a single input file.
C) All data for a given value, regardless of which mapper(s) produced it.
D) All data produced by a single mapper.

Solutions: