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Cloudera Certified Developer for Apache Hadoop Sample Questions:

1. What is the standard configuration of slave nodes in a Hadoop cluster?

A) Each slave node runs a JobTracker and a DataNode daemon.
B) Each slave node runs a TaskTracker, but only a fraction of the slave nodes run DataNode daemons.
C) Each slave node either runs a TaskTracker or a DataNode daemon, but not both.
D) Each slave node runs a TaskTracker and a DataNode daemon.
E) Each slave node runs a DataNode daemon, but only a fraction of the slave nodes run TaskTrackers.

2. Which of the Following best describes the lifecycle of a Mapper?

A) The JobTracker calls the FastTracker's configure () method, then its map () method and finally its closer ()
B) The JobTracker spawns a new Mapper to process all records in a single file.
C) The TaskTracker spawns a new Mapper to process all records in a single input split.
D) The TaskTracker spawns a new Mapper to process each key-value pair.

3. To process input key-value pairs, your mapper needs to load a 512 MB data file in memory. What is the best way to accomplish this?

A) Serialize the data file, insert it in the Jobconf object, and read the data into memory in the configure method of the mapper.
B) Place the data file in theDistributedCacheand read the data into memory in the map method of the mapper.
C) Place the data file in theDistributedCacheand read the data into memory in the configure method of the mapper.
D) Place the datafile in the DataCache and read the data into memory in the configure method ofthe mapper.

4. MapReduce is well-suited for all of the following applications EXCEPT? (Choose one):

A) Online transaction processing (OLTP) for an e-commerce Website.
B) Analysis of large amounts of Web logs (queries, clicks, etc.).
C) Graph mining on a large social network (e.g., Facebook friends network).
D) Text mining on a large collections of unstructured documents.

5. What is a Writable?

A) 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.
B) 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
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.

Solutions: