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

1. Which HDFS command copies an HDFS file named foo to the local filesystem as localFoo?

A) hadoop fs -Is foo
B) hadoop fs -put foo LocalFoo
C) hadoop -cp foo LocalFoo
D) hadoop fs -get foo LocalFoo

2. 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.

3. Which one of the following statements describes a Hive user-defined aggregate function?

A) Operates on a single input row and produces a table as output
B) Operates on multiple input rows and creates a single row as output
C) Operates on multiple input rows and produces a table as output
D) Operates on a single input row and produces a single row as output

4. 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 all the nodes in your production cluster as virtual machines on your development workstation.
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 the DataNode, TaskTracker, NameNode and JobTracker daemons on a single machine.

5. Assuming default settings, which best describes the order of data provided to a reducer's reduce method:

A) Both the keys and values passed to a reducer always appear in sorted order.
B) The keys given to a reducer aren't in a predictable order, but the values associated with those keys always are.
C) Neither keys nor values are in any predictable order.
D) The keys given to a reducer are in sorted order but the values associated with each key are in no predictable order

Solutions: