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

2. Table metadata in Hive is:

A) Stored as metadata on the NameNode.
B) Stored in the Metastore.
C) Stored along with the data in HDFS.
D) Stored in ZooKeeper.

3. Which one of the following statements describes the relationship between the NodeManager and the ApplicationMaster?

A) The ApplicationMaster starts the NodeManager outside of a Container
B) The NodeManager creates an instance of the ApplicationMaster
C) The ApplicationMaster starts the NodeManager in a Container
D) The NodeManager requests resources from the ApplicationMaster

4. For each intermediate key, each reducer task can emit:

A) One final key-value pair per key; no restrictions on the type.
B) As many final key-value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).
C) As many final key-value pairs as desired, but they must have the same type as the intermediate key-value pairs.
D) One final key-value pair per value associated with the key; no restrictions on the type.
E) As many final key-value pairs as desired, as long as all the keys have the same type and all the values have the same type.

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

Solutions: