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

1. You are developing a MapReduce job for sales reporting. The mapper will process input keys
representing the year (IntWritable) and input values representing product indentifies (Text).
Indentify what determines the data types used by the Mapper for a given job.

A) The key and value types specified in the JobConf.setMapInputKeyClass and
JobConf.setMapInputValuesClass methods
B) The mapper-specification.xml file submitted with the job determine the mapper's input key and value
types.
C) The data types specified in HADOOP_MAP_DATATYPES environment variable
D) The InputFormat used by the job determines the mapper's input key and value types.

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

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

3. Which TWO of the following statements are true regarding Hive? Choose 2 answers

A) Offers real-time queries and row level updates
B) Allows you to define a structure for your unstructured Big Data
C) Is a relational database
D) Useful for data analysts familiar with SQL who need to do ad-hoc queries

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

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

A) Not until all mappers have finished processing all records.
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) It depends on the InputFormat used for the job.

Solutions: