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

1. A combiner reduces:

A) The number of input files a mapper must process.
B) The number of output files a reducer must produce.
C) The number of values across different keys in the iterator supplied to a single reduce method call.
D) The amount of intermediate data that must be transferred between the mapper and reducer.

2. You have the following key-value pairs as output from your Map task:
(the, 1) (fox, 1) (faster, 1) (than, 1) (the, 1) (dog, 1)
How many keys will be passed to the Reducer's reduce method?

A) Two
B) Six
C) Three
D) Four
E) One
F) Five

3. You use the hadoop fs -put command to write a 300 MB file using and HDFS block size of 64 MB. Just after this command has finished writing 200 MB of this file, what would another user see when trying to access this life?

A) They would see the current state of the file, up to the last bit written by the command.
B) They would see Hadoop throw an ConcurrentFileAccessException when they try to access this file.
C) They would see the current of the file through the last completed block.
D) They would see no content until the whole file written and closed.

4. All keys used for intermediate output from mappers must:

A) Implement a comparator for speedy sorting.
B) Be a subclass of FileInputFormat.
C) Implement WritableComparable.
D) Implement a splittable compression algorithm.
E) Override isSplitable.

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

Solutions: