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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) WritableComparable
C) Partitioner
D) Combiner
E) Writable
F) InputFormat

2. 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 read the intermediate data from HDFS.
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 copy the intermediate data to the local disks of the machines running the reduce tasks.

3. You need to import a portion of a relational database every day as files to HDFS, and generate Java classes to Interact with your imported data. Which of the following tools should you use to accomplish this?

A) Sqoop
B) Oozie
C) Hue
D) Flume
E) Pig
F) Hive
G) fuse-dfs

4. Which of the following statements most accurately describes the relationship between MapReduce and Pig?

A) Pig provides no additional capabilities to MapReduce. Pig programs are executed as MapReduce jobs via the Pig interpreter.
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 programs rely on MapReduce but are extensible, allowing developers to do special-purpose processing not provided by MapReduce.

5. 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) 6
C) 5
D) 1
E) 0

Solutions: