Try Cloudera : CCD-333 valid & accurate questions and answers
Updated: Sep 05, 2025
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Cloudera Certified Developer for Apache Hadoop Sample Questions:
1. 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) OutputFormat
B) Combiner
C) InputFormat
D) WritableComparable
E) Partitioner
F) Writable
2. Which of the following statements most accurately describes the relationship between MapReduce and Pig?
A) Pig programs rely on MapReduce but are extensible, allowing developers to do special-purpose processing not provided by MapReduce.
B) Pig provides additional capabilities that allow certain types of data manipulation not possible with MapReduce.
C) Pig provides the additional capability of allowing you to control the flow of multiple MapReduce jobs.
D) Pig provides no additional capabilities to MapReduce. Pig programs are executed as MapReduce jobs via the Pig interpreter.
3. To process input key-value pairs, your mapper needs to load a 512 MB data file in memory. What is the best way to accomplish this?
A) Place the data file in theDistributedCacheand read the data into memory in the configure method of the mapper.
B) Serialize the data file, insert it in the Jobconf object, and read the data into memory in the configure method of the mapper.
C) Place the datafile in the DataCache and read the data into memory in the configure method ofthe mapper.
D) Place the data file in theDistributedCacheand read the data into memory in the map method of the mapper.
4. In the reducer, the MapReduce API provides you with an iterator over Writable values. Calling the next () method:
A) 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.
B) Returns a reference to a Writable object from an object pool.
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 a different Writable object each time.
E) Returns a reference to the same writable object each time, but populated with different data.
5. Does the MapReduce programming model provide a way for reducers to communicate with each other?
A) Yes, reducers can communicate with each other by dispatching intermediate key value pairs that get shuffled to another reduce
B) Yes, all reducers can communicate with each other by passing information through the jobconf object.
C) No, each reducer runs independently and in isolation.
D) Yes, reducers running on the same machine can communicate with each other through shared memory, but not reducers on different machines.
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: C | Question # 3 Answer: D | Question # 4 Answer: E | Question # 5 Answer: C |
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