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

2. Your client application submits a MapReduce job to your Hadoop cluster. The Hadoop framework looks for an available slot to schedule the MapReduce operations on which of the following Hadoop computing daemons?

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

3. What is a Writable?

A) Writable is an abstract class that all keys and values in MapReduce must extend. Classes extending this abstract base class must implement methods for serializing and deserializing themselves
B) Writable is an interface that all keys, but not values, in MapReduce must implement. Classes implementing this interface must implement methods for serializing and deserializing themselves.
C) Writable is an abstract class that all keys, but not values, in MapReduce must extend. Classes extending this abstract base class must implement methods for serializing and deserializing themselves.
D) Writable is an interface that all keys and values in MapReduce must implement. Classes implementing this interface must implement methods for serializing and deserializing themselves.

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

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

5. You need a distributed, scalable, data Store that allows you random, realtime read/write access to hundreds of terabytes of data. Which of the following would you use?

A) Flume
B) Oozie
C) Sqoop
D) Hive
E) HBase
F) Hue
G) Pig

Solutions: