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

1. You are developing a combiner that takes as input Text keys, IntWritable values, and emits Text keys,
IntWritable values. Which interface should your class implement?

A) Combiner <Text, Text, IntWritable, IntWritable>
B) Reducer <Text, IntWritable, Text, IntWritable>
C) Combiner <Text, IntWritable, Text, IntWritable>
D) Mapper <Text, IntWritable, Text, IntWritable>
E) Reducer <Text, Text, IntWritable, IntWritable>

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

3. Which YARN component is responsible for monitoring the success or failure of a Container?

A) NodeManager
B) ResourceManager
C) JobTracker
D) ApplicationMaster

4. When is the earliest point at which the reduce method of a given Reducer can be called?

A) It depends on the InputFormat used for the job.
B) As soon as at least one mapper has finished processing its input split.
C) As soon as a mapper has emitted at least one record.
D) Not until all mappers have finished processing all records.

5. Indentify which best defines a SequenceFile?

A) 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.
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 of WritableComparable objects, in
sorted order.
D) A SequenceFile contains a binary encoding of an arbitrary number of homogeneous Writable objects

Solutions: