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

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

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

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) Four, all files will be processed
D) Two, file names with a leading period or underscore are ignored
E) One, no special characters can prefix the name of an input file

3. What is a SequenceFile?

A) A SequenceFile contains a binary encoding of an arbitrary number of homogeneous writable objects.
B) A SequenceFile contains a binary encoding of an arbitrary number key-value pairs. Each key must be
the same type. Each value must be same type.
C) A SequenceFile contains a binary encoding of an arbitrary number of WritableComparable objects, in
sorted order.
D) A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous writable objects.

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

5. What is the term for the process of moving map outputs to the reducers?

A) Combining
B) Shuffling and sorting
C) Reducing
D) Partitioning

Solutions: