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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. Your Custer's HOFS block size is 64MB. You have a directory containing 100 plain text files, each of which Is 100MB in size. The InputFormat for your job is TextInputFormat. How many Mappers will run?

A) 100
B) 64
C) 200
D) 640

2. Which of the following utilities allows you to create and run MapReduce jobs with any executable or script as the mapper and/or the reducer?

A) Hadoop Streaming
B) Flume
C) Oozie
D) Sqoop

3. 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 the additional capability of allowing you to control the flow of multiple MapReduce jobs.
C) Pig programs rely on MapReduce but are extensible, allowing developers to do special-purpose processing not provided by MapReduce.
D) Pig provides additional capabilities that allow certain types of data manipulation not possible with MapReduce.

4. You use the hadoop fs -put command to write a 300 MB file using an HDFS block size of 64 MB. Just after this command has finished writing 200 MB of this file, what would another user see when trying to access this file?

A) They would see no content until the whole file is written and closed.
B) They would see Hadoop throw an concurrentFileAccessException when they try to access this file.
C) They would see the content of the file through the last completed block.
D) They would see the current state of the file, up to the last bit written by the command.

5. In a MapReduce job with 500 map tasks, how many map task attempts will there be?

A) At least 500.
B) Between 500 and 1000.
C) At most 500.
D) It depends on the number of reducers in the job.
E) Exactly 500.

Solutions: