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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. The NameNode uses RAM for the following purpose:

A) To manage distributed read and write locks on files in HDFS.
B) To store the contents of files in HDFS.
C) To store filenames, list of blocks and other meta information.
D) To store the edits log that keeps track of changes in HDFS.

2. You have the following key value pairs as output from your Map task:
(The, 1)
(Fox, 1)
(Runs, 1)
(Faster, 1)
(Than, 1)
(The, 1)
(Dog, 1)
How many keys will be passed to the reducer?

A) One
B) Two
C) Three
D) Five
E) Six
F) Four

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

A) It accepts a single key-value pair as input and emits a single key and list of corresponding values as output
B) It accepts a list of key-value pairs as input hut run emit only one key value pair 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. Which happens if the NameNode crashes?

A) The Secondary NameNode seamlessly takes over and there is no service interruption.
B) HDFS becomes unavailable to new MapReduce jobs, but running jobs will continue until completion.
C) HDFS becomes temporarily unavailable until an administrator starts redirecting client requests to the Secondary NameNode.
D) HDFS becomes unavailable until the NameNode is restored.

5. Given a Mapper, Reducer, and Driver class packaged into a jar, which is the correct way of submitting the job to the cluster?

A) jar MyJar.jar MyDriverClass inputdir outputdir
B) jar MyJar.jar
C) hadoop jar class MyJar.jar MyDriverClass inputdir outputdir
D) hadoop jar MyJar.jar MyDriverClass inputdir outputdir

Solutions: