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Hortonworks Hadoop 2.0 Certification exam for Pig and Hive Developer Sample Questions:

1. Workflows expressed in Oozie can contain:

A) Sequences of MapReduce and Pig jobs. These are limited to linear sequences of actions with exception handlers but no forks.
B) Iterntive repetition of MapReduce jobs until a desired answer or state is reached.
C) Sequences of MapReduce and Pig. These sequences can be combined with other actions including forks, decision points, and path joins.
D) Sequences of MapReduce job only; on Pig on Hive tasks or jobs. These MapReduce sequences can be combined with forks and path joins.

2. You have a directory named jobdata in HDFS that contains four files: _first.txt, second.txt, .third.txt and #data.txt. How many files will be processed by the FileInputFormat.setInputPaths () command when it's given a path object representing this directory?

A) Three, the pound sign is an invalid character for HDFS file names
B) None, the directory cannot be named jobdata
C) Two, file names with a leading period or underscore are ignored
D) Four, all files will be processed
E) One, no special characters can prefix the name of an input file

3. Which best describes how TextInputFormat processes input files and line breaks?

A) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReaders of both splits containing the broken line.
B) Input file splits may cross line breaks. A line that crosses file splits is ignored.
C) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the split that contains the beginning of the broken line.
D) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the split that contains the end of the broken line.
E) The input file is split exactly at the line breaks, so each RecordReader will read a series of complete lines.

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

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

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

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