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Hortonworks Hadoop 2.0 Certification exam for 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) 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) When the signature of the reduce method matches the signature of the combine method.
C) Always. Code can be reused in Java since it is a polymorphic object-oriented programming language.
D) Always. The point of a combiner is to serve as a mini-reducer directly after the map phase to increase performance.
E) Never. Combiners and reducers must be implemented separately because they serve different purposes.

2. Indentify which best defines a SequenceFile?

A) A SequenceFile contains a binary encoding of an arbitrary number of WritableComparable objects, in sorted order.
B) A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous Writable objects
C) A SequenceFile contains a binary encoding of an arbitrary number key-value pairs. Each key must be the same type. Each value must be the same type.
D) A SequenceFile contains a binary encoding of an arbitrary number of homogeneous Writable objects

3. Which one of the following Hive commands uses an HCatalog table named x?

A) SELECT * FROM x;
B) Hive commands cannot reference an HCatalog table
C) SELECT x.-FROM org.apache.hcatalog.hive.HCatLoader('x');
D) SELECT * FROM org.apache.hcatalog.hive.HCatLoader('x');

4. Which HDFS command displays the contents of the file x in the user's HDFS home directory?

A) hadoop fs -cat x
B) hadoop fs -cp x
C) hdfs fs -get x
D) hadoop fs -Is x

5. In a MapReduce job with 500 map tasks, how many map task attempts will there be?

A) At most 500.
B) It depends on the number of reduces in the job.
C) At least 500.
D) Exactly 500.
E) Between 500 and 1000.

Solutions: