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

1. Review the following 'data' file and Pig code.

Which one of the following statements is true?

A) The code does not execute successfully because D is not a valid relation
B) The Output Of the DUMP D command IS (M,{(M,62.95102),(M,38,95111)})
C) The code executes successfully but there is not output because the D relation is empty
D) The output of the dump d command is (M, {(38,95in),(62,95i02)})

2. Which one of the following statements is false about HCatalog?

A) Designed to be used by other programs such as Pig, Hive and MapReduce
B) Provides a shared schema mechanism
C) Exists as a subproject of Hive
D) Stores HDFS data in a database for performing SQL-like ad-hoc queries

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 single key-value pair as input and emits a single key and list of corresponding values 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 list key-value pairs as input and can emit only one key-value pair as output.

4. Which one of the following files is required in every Oozie Workflow application?

A) Oozie.xml
B) Config-default.xml
C) Workflow.xml
D) job.properties

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

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

Solutions: