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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. How does the NameNode detect that a DataNode has failed?

A) When HDFS starts up, the NameNode tries to communicate with the DataNode and considers the DataNode as failed if it does not respond.
B) The NameNode does not need to know that a DataNode has failed.
C) When the NameNode fails to receive periodic heartbeats from the DataNode, it considers the DataNode as failed.
D) The NameNode periodically pings the datanode. If the DataNode does not respond, the NameNode considers the DataNode as failed.

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. The Hadoop framework provides a mechanism for coping with machine issues such as faulty configuration or impending hardware failure. MapReduce detects that one or a number of machines are performing poorly and starts more copies of a map or reduce task. All the tasks run simultaneously and the task that finish first are used. This is called:

A) Speculative Execution
B) IdentityMapper
C) IdentityReducer
D) Combiner
E) Default Partitioner

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

5. Which MapReduce daemon runs on each slave node and participates in job execution?

A) NameNode
B) Secondary NameNode
C) TaskTracker
D) JobTracker

Solutions: