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Hadoop 2.0 Certification exam for Pig and Hive Developer Questions and Answers

Question 1

You have just executed a MapReduce job. Where is intermediate data written to after being emitted from the Mapper’s map method?

Options:

A.

Intermediate data in streamed across the network from Mapper to the Reduce and is never written to disk.

B.

Into in-memory buffers on the TaskTracker node running the Mapper that spill over and are written into HDFS.

C.

Into in-memory buffers that spill over to the local file system of the TaskTracker node running the Mapper.

D.

Into in-memory buffers that spill over to the local file system (outside HDFS) of the TaskTracker node running the Reducer

E.

Into in-memory buffers on the TaskTracker node running the Reducer that spill over and are written into HDFS.

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Question 2

You have the following key-value pairs as output from your Map task:

(the, 1)

(fox, 1)

(faster, 1)

(than, 1)

(the, 1)

(dog, 1)

How many keys will be passed to the Reducer’s reduce method?

Options:

A.

Six

B.

Five

C.

Four

D.

Two

E.

One

F.

Three

Question 3

Your client application submits a MapReduce job to your Hadoop cluster. Identify the Hadoop daemon on which the Hadoop framework will look for an available slot schedule a MapReduce operation.

Options:

A.

TaskTracker

B.

NameNode

C.

DataNode

D.

JobTracker

E.

Secondary NameNode