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Hortonworks Apache-Hadoop-Developer Exam Syllabus Topics:

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

1. When can a reduce class also serve as a combiner without affecting the output of a MapReduce program?

A) When the signature of the reduce method matches the signature of the combine method.
B) Always. The point of a combiner is to serve as a mini-reducer directly after the map phase to increase performance.
C) Never. Combiners and reducers must be implemented separately because they serve different purposes.
D) When the types of the reduce operation's input key and input value match the types of the reducer's output key and output value and when the reduce operation is both communicative and associative.
E) Always. Code can be reused in Java since it is a polymorphic object-oriented programming language.

2. What are the TWO main components of the YARN ResourceManager process? Choose 2 answers

A) Task Tracker
B) Scheduler
C) Job Tracker
D) Applications Manager

3. What does the following WebHDFS command do?
Curl -1 -L "http://host:port/webhdfs/v1/foo/bar?op=OPEN"

A) Read a file /foo/bar
B) Delete a directory /foo/bar
C) List a directory /foo
D) Make a directory /foo/bar

4. Which one of the following Hive commands uses an HCatalog table named x?

A) SELECT * FROM org.apache.hcatalog.hive.HCatLoader('x');
B) Hive commands cannot reference an HCatalog table
C) SELECT * FROM x;
D) SELECT x.-FROM org.apache.hcatalog.hive.HCatLoader('x');

5. You have written a Mapper which invokes the following five calls to the OutputColletor.collect method:
output.collect (new Text ("Apple"), new Text ("Red") ) ;
output.collect (new Text ("Banana"), new Text ("Yellow") ) ;
output.collect (new Text ("Apple"), new Text ("Yellow") ) ;
output.collect (new Text ("Cherry"), new Text ("Red") ) ;
output.collect (new Text ("Apple"), new Text ("Green") ) ;
How many times will the Reducer's reduce method be invoked?

A) 6
B) 1
C) 0
D) 5
E) 3

Solutions: