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

1. MapReduce v2 (MRv2/YARN) is designed to address which two issues?

A) HDFS latency.
B) Reduce complexity of the MapReduce APIs.
C) Single point of failure in the NameNode.
D) Ability to run frameworks other than MapReduce, such as MPI.
E) Standardize on a single MapReduce API.
F) Resource pressure on the JobTracker.

2. To process input key-value pairs, your mapper needs to lead a 512 MB data file in memory. What is the best way to accomplish this?

A) Serialize the data file, insert in it the JobConf object, and read the data into memory in the configure method of the mapper.
B) Place the data file in the DistributedCache and read the data into memory in the map method of the mapper.
C) Place the data file in the DataCache and read the data into memory in the configure method of the mapper.
D) Place the data file in the DistributedCache and read the data into memory in the configure method of the mapper.

3. Which Hadoop component is responsible for managing the distributed file system metadata?

A) Metanode
B) NameSpaceManager
C) DataNode
D) NameNode

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

5. In the reducer, the MapReduce API provides you with an iterator over Writable values. What does calling the next () method return?

A) It returns a reference to the same Writable object each time, but populated with different data.
B) It returns a reference to a different Writable object time.
C) It returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.
D) It returns a reference to a Writable object from an object pool.
E) It returns a reference to the same Writable object if the next value is the same as the previous value, or a new Writable object otherwise.

Solutions: