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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. You have the following key value pairs as output from your Map task:
(The, 1)
(Fox, 1)
(Runs, 1)
(Faster, 1)
(Than, 1)
(The, 1)
(Dog, 1)
How many keys will be passed to the reducer?

A) One
B) Six
C) Three
D) Two
E) Five
F) Four

2. MapReduce is well-suited for all of the following applications EXCEPT? (Choose one):

A) Text mining on a large collections of unstructured documents.
B) Graph mining on a large social network (e.g., Facebook friends network).
C) Online transaction processing (OLTP) for an e-commerce Website.
D) Analysis of large amounts of Web logs (queries, clicks, etc.).

3. For each input key-value pair, mappers can emit:

A) As many intermediate key-value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).
B) As many intermediate key value pairs as desired, as long as all the keys have the same type and all the values have the same type.
C) One intermediate key value pair, but of the same type.
D) As many intermediate key-value pairs as desired, but they cannot be of the same type as the input key-value pair.
E) One intermediate key value pair, of a different type.

4. In a MapReduce job, the reducer receives all values associated with the same key. Which statement is most accurate about the ordering of these values?

A) Since the values come from mapper outputs, the reducers will receive contiguous sections of sorted values.
B) The values are arbitrarily ordered, but multiple runs of the same MapReduce job will always have the same ordering.
C) The values are in sorted order.
D) The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce job.

5. Your cluster has 10 DataNodes, each with a single 1 TB hard drive. You utilize all your disk capacity for HDFS, reserving none for MapReduce. You implement default replication settings. What is the storage capacity of your Hadoop cluster (assuming no compression)?

A) about 5 TB
B) about 3 TB
C) about 10 TB
D) about 11 TB

Solutions: