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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, reducers running on the same machine can communicate with each other through shared memory, but not reducers on different machines.
C) No, each reducer runs independently and in isolation.
D) Yes, all reducers can communicate with each other by passing information through the jobconf object.

2. The NameNode uses RAM for the following purpose:

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

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

A) It accepts a list of key-value pairs as input hut run emit only one key value pair as output.
B) It accepts a single key-value pair as input and can emit only one key-value pair as output.
C) It accepts a single key-value pair as input and emits a single key and list of corresponding values as output
D) It accepts a single key-value pair as input and can emit any number of key-value pairs as output, including zero.

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) NameNode
C) Secondary NameNode
D) TaskTracker
E) DataNode

5. 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) Sqoop
B) Hadoop Streaming
C) Oozie
D) Flume

Solutions: