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

1. Which one of the following statements is true regarding a MapReduce job?

A) The job's Partitioner shuffles and sorts all (key.value) pairs and sends the output to all reducers
B) The default Hash Partitioner sends key value pairs with the same key to the same Reducer
C) The reduce method is invoked once for each unique value
D) The Mapper must sort its output of (key.value) pairs in descending order based on value

2. You want to perform analysis on a large collection of images. You want to store this data in HDFS and process it with MapReduce but you also want to give your data analysts and data scientists the ability to process the data directly from HDFS with an interpreted high-level programming language like Python. Which format should you use to store this data in HDFS?

A) HTML
B) Avro
C) JSON
D) CSV
E) SequenceFiles
F) XML

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

4. Indentify which best defines a SequenceFile?

A) A SequenceFile contains a binary encoding of an arbitrary number key-value pairs. Each key must be the same type. Each value must be the same type.
B) A SequenceFile contains a binary encoding of an arbitrary number of homogeneous Writable objects
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

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

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

Solutions: