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

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

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

3. You are developing a combiner that takes as input Text keys, IntWritable values, and emits Text keys, Intwritable values. Which interface should your class implement?

A) Combiner <Text, Text, IntWritable, IntWritable>
B) Reducer <Text, IntWritable, Text, IntWritable>
C) Combiner <Text, IntWritable, Text, IntWritable>
D) Mapper <Text, IntWritable, Text, IntWritable>
E) Reducer <Text, Text, IntWritable, IntWritable>

4. What is the difference between a failed task attempt and a killed task attempt?

A) A failed task attempt is a task attempt that completed, but with an unexpected status value. A killed task attempt is a duplicate copy of a task attempt that was started as part of speculative execution.
B) A failed task attempt is a task attempt that threw an unhandled exception. A killed task attempt is one that was terminated by the JobTracker.
C) A failed task attempt is a task attempt that did not generate any key value pairs. A killed task attempt is a task attempt that threw an exception, and thus killed by the execution framework.
D) A failed task attempt is a task attempt that threw a RuntimeException (i.e., the task fails). A killed task attempt is a task attempt that threw any other type of exception (e.g., IOException); the execution framework catches these exceptions and reports them as killed.

5. Which MapReduce daemon runs on each slave node and participates in job execution?

A) NameNode
B) JobTracker
C) Secondary NameNode
D) TaskTracker

Solutions: