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

1. When can a reduce class also serve as a combiner without affecting the output of a MapReduce program?

A) Always. Code can be reused in Java since it is a polymorphic object-oriented programming language.
B) When the signature of the reduce method matches the signature of the combine method.
C) When the types of the reduce operation's input key and input value match the types of the reducer's output key and output value and when the reduce operation is both communicative and associative.
D) Never. Combiners and reducers must be implemented separately because they serve different purposes.
E) Always. The point of a combiner is to serve as a mini-reducer directly after the map phase to increase performance.

2. Which HDFS command copies an HDFS file named foo to the local filesystem as localFoo?

A) hadoop fs -Is foo
B) hadoop fs -get foo LocalFoo
C) hadoop fs -put foo LocalFoo
D) hadoop -cp foo LocalFoo

3. Which best describes what the map method accepts and emits?

A) It accepts a single key-value pairs as input and can emit any number of key-value pair as output,
including zero.
B) It accepts a list key-value pairs as input and can emit only one key-value pair as output.
C) It accepts a single key-value pairs as input and can emit only one key-value pair as output.
D) It accepts a single key-value pair as input and emits a single key and list of corresponding values as
output.

4. Which process describes the lifecycle of a Mapper?

A) The JobTracker calls the TaskTracker's configure () method, then its map () method and finally its close () method.
B) The JobTracker spawns a new Mapper to process all records in a single file.
C) The TaskTracker spawns a new Mapper to process each key-value pair.
D) The TaskTracker spawns a new Mapper to process all records in a single input split.

5. Examine the following Hive statements:

Assuming the statements above execute successfully, which one of the following statements is true?

A) The SORT BY command causes only one reducer to be used
B) Each reducer generates a file sorted by age
C) The output of each reducer is only the age column
D) The output is guaranteed to be a single file with all the data sorted by age

Solutions: