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

1. Which one of the following statements is FALSE regarding the communication between DataNodes and a
federation of NameNodes in Hadoop 2.0?

A) Each DataNode registers with all the NameNodes.
B) Each DataNode receives commands from one designated master NameNode.
C) DataNodes send periodic block reports to all the NameNodes.
D) DataNodes send periodic heartbeats to all the NameNodes.

2. On a cluster running MapReduce v1 (MRv1), a TaskTracker heartbeats into the JobTracker on your
cluster, and alerts the JobTracker it has an open map task slot.
What determines how the JobTracker assigns each map task to a TaskTracker?

A) The amount of RAM installed on the TaskTracker node.
B) The average system load on the TaskTracker node over the past fifteen (15) minutes.
C) The number and speed of CPU cores on the TaskTracker node.
D) The amount of free disk space on the TaskTracker node.
E) The location of the InsputSplit to be processed in relation to the location of the node.

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

4. 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 bigram of the top 80 sentences that contain the substring "you are" in the lines column of the input
data A1 table.
D) A frequency distribution of the top 80 words that follow the subsequence "you are" in the lines column
of the inputdata table.

5. Which best describes how TextInputFormat processes input files and line breaks?

A) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the
split that contains the beginning of the broken line.
B) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReaders of
both splits containing the broken line.
C) Input file splits may cross line breaks. A line that crosses file splits is ignored.
D) Input file splits may cross line breaks. A line that crosses file splits is read by the RecordReader of the
split that contains the end of the broken line.
E) The input file is split exactly at the line breaks, so each RecordReader will read a series of complete
lines.

Solutions: