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

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) Oozie
C) Sqoop
D) Flume

3. In the reducer, the MapReduce API provides you with an iterator over Writable values. Calling the next () method:

A) Returns a reference to a Writable object from an object pool.
B) Returns a reference to a different Writable object each time.
C) Returns a reference to the same writable object if the next value is the same as the previous value, or a new writable object otherwise.
D) Returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.
E) Returns a reference to the same writable object each time, but populated with different data.

4. 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) JobTracker
B) TaskTracker
C) Secondary NameNode
D) NameNode
E) DataNode

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

Solutions: