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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 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) 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.

2. Which one of the following statements is FALSE regarding the communication between DataNodes and a federation of NameNodes in Hadoop 2.0?

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

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

4. For each intermediate key, each reducer task can emit:

A) As many final key-value pairs as desired, but they must have the same type as the intermediate key-value pairs.
B) One final key-value pair per value associated with the key; no restrictions on the type.
C) As many final key-value pairs as desired, as long as all the keys have the same type and all the values have the same type.
D) As many final key-value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).
E) One final key-value pair per key; no restrictions on the type.

5. Examine the following Pig commands:

Which one of the following statements is true?

A) The reducers will only output the first 20% of the data passed from the mappers
B) A random sample of approximately 20% of the data will be output
C) The SAMPLE command generates an "unexpected symbol" error
D) Each MapReduce task will terminate after executing for 0.2 minutes

Solutions: