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Cloudera CCD-333 Exam Syllabus Topics:

Cloudera Certified Developer for Apache Hadoop Sample Questions:

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

2. What happens in a MapReduce job when you set the number of reducers to zero?

A) No reducer executes, but the outputs of all the mappers are gathered together and written to a single file in HDFS.
B) No reducer executes, but the mappers generate no output.
C) Setting the number of reducers to zero is invalid, and an exception is thrown.
D) No reducer executes, and the output of each mapper is written to a separate file in HDFS.

3. The Hadoop framework provides a mechanism for coping with machine issues such as faulty configuration or impending hardware failure. MapReduce detects that one or a number of machines are performing poorly and starts more copies of a map or reduce task. All the tasks run simultaneously and the task that finish first are used. This is called:

A) IdentityMapper
B) Default Partitioner
C) IdentityReducer
D) Combiner
E) Speculative Execution

4. Custom programmer-defined counters in MapReduce are:

A) Lightweight devices for bookkeeping within MapReduce programs.
B) Lightweight devices for synchronization within MapReduce programs. You can use counters to coordinate execution between a mapper and a reducer.
C) Lightweight devices for ensuring the correctness of a MapReduce program. Mappers Increment counters, and reducers decrement counters. If at the end of the program the counters read zero, then you are sure that the job completed correctly.

5. What is a SequenceFile?

A) A SequenceFile contains a binary encoding of an arbitrary number of WritableComparable objects, in sorted order.
B) A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous writable objects.
C) A SequenceFile contains a binary encoding of an arbitrary number key-value pairs. Each key must be the same type. Each value must be same type.
D) A SequenceFile contains a binary encoding of an arbitrary number of homogeneous writable objects.

Solutions: