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

1. Which process describes the lifecycle of a Mapper?

A) The JobTracker spawns a new Mapper to process all records in a single file.
B) The JobTracker calls the TaskTracker's configure () method, then its map () method and finally its close () method.
C) The TaskTracker spawns a new Mapper to process all records in a single input split.
D) The TaskTracker spawns a new Mapper to process each key-value pair.

2. You want to perform analysis on a large collection of images. You want to store this data in HDFS and process it with MapReduce but you also want to give your data analysts and data scientists the ability to process the data directly from HDFS with an interpreted high-level programming language like Python. Which format should you use to store this data in HDFS?

A) HTML
B) XML
C) JSON
D) CSV
E) SequenceFiles
F) Avro

3. What data does a Reducer reduce method process?

A) All the data in a single input file.
B) All data produced by a single mapper.
C) All data for a given key, regardless of which mapper(s) produced it.
D) All data for a given value, regardless of which mapper(s) produced it.

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

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

A) 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.
B) 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.
C) 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.
D) 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.

Solutions: