Cloudera CCDH CCD-333

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Cloudera CCD-333 Exam Syllabus Topics:

Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. You have written a Mapper which invokes the following five calls to the outputcollector.collect method:

How many times will the Reducer's reduce method be invoked.

A) 3
B) 1
C) 6
D) 0
E) 5

2. Which of the following utilities allows you to create and run MapReduce jobs with any executable or script as the mapper and/or the reducer?

A) Sqoop
B) Flume
C) Oozie
D) Hadoop Streaming

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

4. You've written a MapReduce job that will process 500 million input records and generate 500 million key-value pairs. The data is not uniformly distributed. Your MapReduce job will create a significant amount of intermediate data that it needs to transfer between mappers and reducers which is a potential bottleneck. A custom implementation of which of the following interfaces is most likely to reduce the amount of intermediate data transferred across the network?

A) Writable
B) Partitioner
C) OutputFormat
D) InputFormat
E) WritableComparable
F) Combiner

5. In the reducer, the MapReduce API provides you with an iterator over Writable values. Calling the next () method:

A) Returns a reference to a different Writable object each time.
B) Returns a reference to the same writable object each time, but populated with different data.
C) Returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.
D) 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.
E) Returns a reference to a Writable object from an object pool.

Solutions: