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

2. Examine the following Hive statements:

Assuming the statements above execute successfully, which one of the following statements is true?

A) The file named File1 is moved to to/user/joe/x/
B) The contents of File1 are parsed as comma-delimited rows and stored in a database
C) Hive reformats File1 into a structure that Hive can access and moves into to/user/joe/x/
D) The contents of File1 are parsed as comma-delimited rows and loaded into /user/joe/x/

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 Hadoop throw an ConcurrentFileAccessException when they try to access this file.
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 the current of the file through the last completed block.

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

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

5. Which two of the following statements are true about Pig's approach toward data? Choose 2 answers

A) Accepts any data: structured or unstructured
B) Accepts only data that has a key/value pair structure
C) Accepts only data that is defined by metadata tables stored in a database
D) Accepts data whether it has metadata or not
E) Accepts tab-delimited text data only

Solutions: