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Cloudera CCD-333 Exam Syllabus Topics:

Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. 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 each time, but populated with different data.
B) Returns a reference to a different Writable object each time.
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 Writable object from an object pool.
E) 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.

2. In a large MapReduce job with m mappers and r reducers, how many distinct copy operations will there be in the sort/shuffle phase?

A) mr (i.e., m to the power of r)
B) m+r (i.e., m plus r)
C) m
D) mxr (i.e., m multiplied by r)
E) r

3. Which of the following best describes the map method input and output?

A) It accepts a list of key-value pairs as input hut run emit only one key value pair as output.
B) It accepts a single key-value pair as input and emits a single key and list of corresponding values as output
C) It accepts a single key-value pair as input and can emit any number of key-value pairs as output, including zero.
D) It accepts a single key-value pair as input and can emit only one key-value pair as output.

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

5. What is the behavior of the default partitioner?

A) The default partitioner computes the hash of the value and takes the mod of that value with the number of reducers. The result determines the reducer assigned to process the key value pair.
B) The default partitioner computes the hash of the key and divides that value modulo the number of reducers. The result determines the reducer assigned to process the key-value pair.
C) The default partitioner implements a round robin strategy, shuffling the key value pairs to each reducer in turn. This ensures an even partition of the key space.
D) The default partitioner assigns key value pairs to reducers based on an internal random number generator.
E) The default partitioner computes the hash of the key. Hash values between specific ranges are associated with different buckets, and each bucket is assigned to a specific reducer.

Solutions: