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Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) Sample Questions:

1. Assuming default settings, which best describes the order of data provided to a reducer's reduce method:

A) The keys given to a reducer aren't in a predictable order, but the values associated with those keys
always are.
B) The keys given to a reducer are in sorted order but the values associated with each key are in no
predictable order
C) Both the keys and values passed to a reducer always appear in sorted order.
D) Neither keys nor values are in any predictable order.

2. You need to perform statistical analysis in your MapReduce job and would like to call methods in the
Apache Commons Math library, which is distributed as a 1.3 megabyte Java archive (JAR) file. Which is
the best way to make this library available to your MapReducer job at runtime?

A) Package your code and the Apache Commands Math library into a zip file named JobJar.zip
B) When submitting the job on the command line, specify the -libjars option followed by the JAR file path.
C) Have your system administrator copy the JAR to all nodes in the cluster and set its location in the
HADOOP_CLASSPATH environment variable before you submit your job.
D) Have your system administrator place the JAR file on a Web server accessible to all cluster nodes and
then set the HTTP_JAR_URL environment variable to its location.

3. Which Two of the following statements are true about hdfs? Choose 2 answers

A) HDFS works best when storing a large number of relatively small files
B) An HDFS file that is larger than dfs.block.size is split into blocks
C) Block sizes for all files must be the same size
D) Blocks are replicated to multiple datanodes

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

5. 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) 6
C) 5
D) 0
E) 1

Solutions: