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

1. You want to run Hadoop jobs on your development workstation for testing before you submit them to your production cluster. Which mode of operation in Hadoop allows you to most closely simulate a production cluster while using a single machine?

A) Run the DataNode, TaskTracker, NameNode and JobTracker daemons on a single machine.
B) Run the hadoop command with the -jt local and the -fs file:///options.
C) Run simldooop, the Apache open-source software for simulating Hadoop clusters.
D) Run all the nodes in your production cluster as virtual machines on your development workstation.

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

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

3. Can you use MapReduce to perform a relational join on two large tables sharing a key? Assume that the two tables are formatted as comma-separated files in HDFS.

A) Yes.
B) Yes, so long as both tables fit into memory.
C) No, but it can be done with either Pig or Hive.
D) No, MapReduce cannot perform relational operations.
E) Yes, but only if one of the tables fits into memory

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

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

5. Assuming the following Hive query executes successfully:

Which one of the following statements describes the result set?

A) An 80-value ngram of sentences that contain the words "you" or "are" in the lines column of the inputdata table.
B) A trigram of the top 80 sentences that contain "you are" followed by a null space in the lines column of the inputdata table.
C) A frequency distribution of the top 80 words that follow the subsequence "you are" in the lines column of the inputdata table.
D) A bigram of the top 80 sentences that contain the substring "you are" in the lines column of the input data A1 table.

Solutions: