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Cloudera CCD-333 Exam Syllabus Topics:

Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. Does the MapReduce programming model provide a way for reducers to communicate with each other?

A) No, each reducer runs independently and in isolation.
B) Yes, reducers can communicate with each other by dispatching intermediate key value pairs that get shuffled to another reduce
C) Yes, reducers running on the same machine can communicate with each other through shared memory, but not reducers on different machines.
D) Yes, all reducers can communicate with each other by passing information through the jobconf object.

2. In a MapReduce job, you want each of you input files processed by a single map task. How do you configure a MapReduce job so that a single map task processes each input file regardless of how many blocks the input file occupies?

A) Set the number of mappers equal to the number of input files you want to process.
B) Write a custom MapRunner that iterates over all key-value pairs in the entire file.
C) Write a custom FileInputFormat and override the method isSplittable to always return false.
D) Increase the parameter that controls minimum split size in the job configuration.

3. Which statement best describes the data path of intermediate key-value pairs (i.e., output of the mappers)?

A) Intermediate key-value pairs are written to HDFS. Reducers copy the intermediate data to the local disks of the machines running the reduce tasks.
B) Intermediate key-value pairs are written to the local disks of the machines running the map tasks, and then copied to the machine running the reduce tasks.
C) Intermediate key-value pairs are written to the local disks of the machines running the map tasks, and are then copied to HDFS. Reducers read the intermediate data from HDFS.
D) Intermediate key-value pairs are written to HDFS. Reducers read the intermediate data from HDFS.

4. 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 if the next value is the same as the previous value, or a new writable object otherwise.
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 each time, but populated with different data.
E) Returns a reference to a Writable object from an object pool.

5. All keys used for intermediate output from mappers must do which of the following:

A) Use a comparator for speedy sorting
B) Implement WritableComparable
C) Be a subclass of Filelnput-Format
D) Override isSplitable
E) Be compressed using a splittable compression algorithm.

Solutions: