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

1. Determine which best describes when the reduce method is first called in a MapReduce job?

A) Reduce methods and map methods all start at the beginning of a job, in order to provide optimal performance for map-only or reduce-only jobs.
B) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed. The reduce method is called as soon as the intermediate key-value pairs start to arrive.
C) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed. The programmer can configure in the job what percentage of the intermediate data should arrive before the reduce method begins.
D) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed. The reduce method is called only after all intermediate data has been copied and sorted.

2. 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.

3. To use a lava user-defined function (UDF) with Pig what must you do?

A) Put the JAR file into the user's home folder in HDFS
B) Define an alias to shorten the function name
C) Register the JAR file containing the UDF
D) Pass arguments to the constructor of UDFs implementation class

4. Which of the following tool was designed to import data from a relational database into HDFS?

A) Sqoop
B) HCatalog
C) Flume
D) Ambari

5. In Hadoop 2.0, which TWO of the following processes work together to provide automatic failover of the NameNode? Choose 2 answers

A) ZKFailoverController
B) ZooKeeper
C) JournalNode
D) QuorumManager

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