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

1. Indentify which method in the Mapper you should use to implement code for reading the file and populating the associative array?

A) init
B) map
C) configure
D) combine

2. Given the following Pig commands:

Which one of the following statements is true?

A) The $1 variable represents the second column of data in 'my.log'
B) The severe relation is not valid
C) The $1 variable represents the first column of data in 'my.log'
D) The grouped relation is not valid

3. When is the earliest point at which the reduce method of a given Reducer can be called?

A) Not until all mappers have finished processing all records.
B) As soon as at least one mapper has finished processing its input split.
C) As soon as a mapper has emitted at least one record.
D) It depends on the InputFormat used for the job.

4. Workflows expressed in Oozie can contain:

A) Sequences of MapReduce and Pig. These sequences can be combined with other actions including forks, decision points, and path joins.
B) Sequences of MapReduce job only; on Pig on Hive tasks or jobs. These MapReduce sequences can be combined with forks and path joins.
C) Iterntive repetition of MapReduce jobs until a desired answer or state is reached.
D) Sequences of MapReduce and Pig jobs. These are limited to linear sequences of actions with exception handlers but no forks.

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 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.

Solutions: