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

1. To use a lava user-defined function (UDF) with Pig what must you do?

A) Pass arguments to the constructor of UDFs implementation class
B) Register the JAR file containing the UDF
C) Put the JAR file into the user's home folder in HDFS
D) Define an alias to shorten the function name

2. What data does a Reducer reduce method process? Reference: Yahoo! Hadoop Tutorial, Module 4:
MapReduce

A) All data for a given value, regardless of which mapper(s) produced it.
B) All data for a given key, regardless of which mapper(s) produced it.
C) All data produced by a single mapper.
D) All the data in a single input file.

3. You want to populate an associative array in order to perform a map-side join. You've decided to put this
information in a text file, place that file into the DistributedCache and read it in your Mapper before any
records are processed. Indentify which method in the Mapper you should use to implement code for
reading the file and populating the associative array?

A) map
B) init
C) configure
D) combine

4. You write MapReduce job to process 100 files in HDFS. Your MapReduce algorithm uses
TextInputFormat: the mapper applies a regular expression over input values and emits key-values pairs
with the key consisting of the matching text, and the value containing the filename and byte offset.
Determine the difference between setting the number of reduces to one and settings the number of
reducers to zero.

A) There is no difference in output between the two settings.
B) With zero reducers, instances of matching patterns are stored in multiple files on HDFS. With one
reducer, all instances of matching patterns are gathered together in one file on HDFS.
C) With zero reducers, no reducer runs and the job throws an exception. With one reducer, instances of
matching patterns are stored in a single file on HDFS.
D) With zero reducers, all instances of matching patterns are gathered together in one file on HDFS. With
one reducer, instances of matching patterns are stored in multiple files on HDFS.

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

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

Solutions: