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

1. 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) 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).
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) One final key-value pair per key; no restrictions on the type.
E) One final key-value pair per value associated with the key; no restrictions on the type.

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 DataCache and read the data into memory in the configure method of the mapper.
C) Place the data file in the DistributedCache 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 map method of the mapper.

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

What is the output of the following Pig commands?
X = GROUP A BY S1; DUMP X;

A) Option D
B) Option A
C) Option B
D) Option C

4. Which YARN component is responsible for monitoring the success or failure of a Container?

A) ResourceManager
B) JobTracker
C) NodeManager
D) ApplicationMaster

5. You use the hadoop fs -put command to write a 300 MB file using and HDFS block size of 64 MB. Just after this command has finished writing 200 MB of this file, what would another user see when trying to access this life?

A) They would see no content until the whole file written and closed.
B) They would see the current of the file through the last completed block.
C) They would see Hadoop throw an ConcurrentFileAccessException when they try to access this file.
D) They would see the current state of the file, up to the last bit written by the command.

Solutions: