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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) 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.
B) 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.
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) 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.

2. What does the following command do?
register '/piggyban):/pig-files.jar';

A) Transforms Pig user-defined functions into a format that Hive can accept
B) Specifies the location of the JAR file containing the user-defined functions
C) Invokes the user-defined functions contained in the jar file
D) Assigns a name to a user-defined function or streaming command

3. How are keys and values presented and passed to the reducers during a standard sort and shuffle phase of MapReduce?

A) Keys are presented to a reducer in random order; values for a given key are sorted in ascending order.
B) Keys are presented to reducer in sorted order; values for a given key are not sorted.
C) Keys are presented to reducer in sorted order; values for a given key are sorted in ascending order.
D) Keys are presented to a reducer in random order; values for a given key are not sorted.

4. Which Two of the following statements are true about hdfs? Choose 2 answers

A) An HDFS file that is larger than dfs.block.size is split into blocks
B) HDFS works best when storing a large number of relatively small files
C) Blocks are replicated to multiple datanodes
D) Block sizes for all files must be the same size

5. What does Pig provide to the overall Hadoop solution?

A) Database table and storage management services
B) C++ interface to MapReduce and data warehouse infrastructure
C) Simple scripting language for writing MapReduce programs
D) Legacy language Integration with MapReduce framework

Solutions: