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

1. In a large MapReduce job with m mappers and n reducers, how many distinct copy operations will there
be in the sort/shuffle phase?

A) m+n (i.e., m plus n)
B) mn (i.e., m to the power of n)
C) n
D) m
E) mXn (i.e., m multiplied by n)

2. In the reducer, the MapReduce API provides you with an iterator over Writable values. What does calling
the next () method return?

A) It returns a reference to a Writable object. The API leaves unspecified whether this is a reused object
or a new object.
B) It returns a reference to a Writable object from an object pool.
C) It returns a reference to the same Writable object if the next value is the same as the previous value, or
a new Writable object otherwise.
D) It returns a reference to the same Writable object each time, but populated with different data.
E) It returns a reference to a different Writable object time.

3. MapReduce v2 (MRv2/YARN) splits which major functions of the JobTracker into separate daemons?
Select two.

A) Managing tasks
B) Job scheduling/monitoring
C) MapReduce metric reporting
D) Launching tasks
E) Resource management
F) Job coordination between the ResourceManager and NodeManager
G) Managing file system metadata
H) Heath states checks (heartbeats)

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

A) One final key-value pair per value associated with the key; no restrictions on the type.
B) As many final key-value pairs as desired, but they must have the same type as the intermediate
key-value pairs.
C) One final key-value pair per key; no restrictions on the type.
D) 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).
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. What does the following command do? register '/piggyban):/pig-files.jar';

A) Specifies the location of the JAR file containing the user-defined functions
B) Assigns a name to a user-defined function or streaming command
C) Transforms Pig user-defined functions into a format that Hive can accept
D) Invokes the user-defined functions contained in the jar file

Solutions: