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

1. Determine which best describes when the reduce method is first called in a MapReduce job?

A) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed.
The reduce method is called as soon as the intermediate key-value pairs start to arrive.
B) Reduce methods and map methods all start at the beginning of a job, in order to provide optimal
performance for map-only or reduce-only jobs.
C) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed.
The reduce method is called only after all intermediate data has been copied and sorted.
D) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed.
The programmer can configure in the job what percentage of the intermediate data should arrive before
the reduce method begins.

2. 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

3. In a large MapReduce job with m mappers and n reducers, how many distinct copy operations will there
be in the sort/shuffle phase?

A) m
B) mn (i.e., m to the power of n)
C) n
D) m+n (i.e., m plus n)
E) mXn (i.e., m multiplied by n)

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

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

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

Solutions: