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Hortonworks HADOOP-PR000007 Exam Syllabus Topics:

Hortonworks-Certified-Apache-Hadoop-2.0-Developer(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) 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.
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. When can a reduce class also serve as a combiner without affecting the output of a MapReduce program?

A) When the signature of the reduce method matches the signature of the combine method.
B) Never. Combiners and reducers must be implemented separately because they serve different purposes.
C) Always. Code can be reused in Java since it is a polymorphic object-oriented programming language.
D) Always. The point of a combiner is to serve as a mini-reducer directly after the map phase to increase performance.
E) When the types of the reduce operation's input key and input value match the types of the reducer's output key and output value and when the reduce operation is both communicative and associative.

3. Review the following 'data' file and Pig code.

Which one of the following statements is true?

A) The code does not execute successfully because D is not a valid relation
B) The output of the dump d command is (M, {(38,95in),(62,95i02)})
C) The Output Of the DUMP D command IS (M,{(M,62.95102),(M,38,95111)})
D) The code executes successfully but there is not output because the D relation is empty

4. Which one of the following statements describes the relationship between the ResourceManager and the
ApplicationMaster?

A) The ApplicationMaster starts an instance of the ResourceManager within each Container
B) The ResourceManager monitors and restarts any failed Containers of the ApplicationMaster
C) The ApplicationMaster starts a single instance of the ResourceManager
D) The ApplicationMaster requests resources from the ResourceManager

5. Consider the following two relations, A and B.

Which Pig statement combines A by its first field and B by its second field?

A) C = JOIN A SO, B $1;
B) C = JOIN A a1, B b2;
C) C = JOIN A by al, B by b2;
D) C = DOIN B BY a1, A by b2;

Solutions: