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

1. You have the following key-value pairs as output from your Map task:
(the, 1) (fox, 1) (faster, 1) (than, 1) (the, 1) (dog, 1)
How many keys will be passed to the Reducer's reduce method?

A) Two
B) Six
C) Five
D) Four
E) Three
F) One

2. You are developing a MapReduce job for sales reporting. The mapper will process input keys representing the year (IntWritable) and input values representing product indentifies (Text).
Indentify what determines the data types used by the Mapper for a given job.

A) The mapper-specification.xml file submitted with the job determine the mapper's input key and value types.
B) The key and value types specified in the JobConf.setMapInputKeyClass and JobConf.setMapInputValuesClass methods
C) The data types specified in HADOOP_MAP_DATATYPES environment variable
D) The InputFormat used by the job determines the mapper's input key and value types.

3. You need to move a file titled "weblogs" into HDFS. When you try to copy the file, you can't. You know you have ample space on your DataNodes. Which action should you take to relieve this situation and store more files in HDFS?

A) Increase the number of disks (or size) for the NameNode.
B) Increase the amount of memory for the NameNode.
C) Decrease the block size on all current files in HDFS.
D) Decrease the block size on your remaining files.
E) Increase the block size on all current files in HDFS.
F) Increase the block size on your remaining files.

4. Which one of the following classes would a Pig command use to store data in a table defined in HCatalog?

A) No special class is needed for a Pig script to store data in an HCatalog table
B) Pig scripts cannot use an HCatalog table
C) org.apache.hcatalog.pig.HCatStorer
D) org.apache.hcatalog.pig.HCatOutputFormat

5. 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,{(M,62.95102),(M,38,95111)})
C) The code does not execute successfully because D is not a valid relation
D) The output of the dump d command is (M, {(38,95in),(62,95i02)})

Solutions: