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

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

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

2. For each input key-value pair, mappers can emit:

A) One intermediate key-value pair, but of the same type.
B) One intermediate key-value pair, of a different type.
C) As many intermediate key-value pairs as designed, but they cannot be of the same type as the input
key-value pair.
D) As many intermediate key-value pairs as designed. There are no restrictions on the types of those
key-value pairs (i.e., they can be heterogeneous).
E) As many intermediate key-value pairs as designed, as long as all the keys have the same types and all
the values have the same type.

3. All keys used for intermediate output from mappers must:

A) Implement a comparator for speedy sorting.
B) Override isSplitable.
C) Implement a splittable compression algorithm.
D) Be a subclass of FileInputFormat.
E) Implement WritableComparable.

4. Which one of the following statements describes a Pig bag. tuple, and map, respectively?

A) Ordered set of fields, ordered collection of tuples, ordered collection of maps
B) Unordered collection of tuples, ordered set of fields, set of key value pairs
C) Unordered collection of maps, ordered collection of tuples, ordered set of key/value pairs
D) Ordered collection of maps, ordered collection of bags, and unordered set of key/value pairs

5. You want to run Hadoop jobs on your development workstation for testing before you submit them to your
production cluster. Which mode of operation in Hadoop allows you to most closely simulate a production
cluster while using a single machine?

A) Run all the nodes in your production cluster as virtual machines on your development workstation.
B) Run simldooop, the Apache open-source software for simulating Hadoop clusters.
C) Run the hadoop command with the -jt local and the -fs file:///options.
D) Run the DataNode, TaskTracker, NameNode and JobTracker daemons on a single machine.

Solutions: