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

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

2. 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 Hadoop throw an ConcurrentFileAccessException when they try to access this file.
D) They would see the current state of the file, up to the last bit written by the command.

3. Assuming the following Hive query executes successfully:

Which one of the following statements describes the result set?

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

4. A combiner reduces:

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

5. Identify the MapReduce v2 (MRv2 / YARN) daemon responsible for launching application containers and
monitoring application resource usage?

A) JobTracker
B) TaskTracker
C) ResourceManager
D) ApplicationMasterService
E) ApplicationMaster
F) NodeManager

Solutions: