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最新的 CCDH CCD-333 免費考試真題:

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

2. Your Custer's HOFS block size is 64MB. You have a directory containing 100 plain text files, each of which Is 100MB in size. The InputFormat for your job is TextInputFormat. How many Mappers will run?

A) 100
B) 64
C) 640
D) 200

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

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

4. Combiners Increase the efficiency of a MapReduce program because:

A) They provide an optimization and reduce the total number of computations that are needed to execute an algorithm by a factor of n, where is the number of reducer.
B) They aggregate intermediate map output locally on each individual machine and therefore reduce the amount of data that needs to be shuffled across the network to the reducers.
C) They provide a mechanism for different mappers to communicate with each Other, thereby reducing synchronization overhead.
D) They aggregate intermediate map output horn a small number of nearby (i.e., rack-local) machines and therefore reduce the amount of data that needs to be shuffled across the network to the reducers.

5. 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 interface that all keys and values in MapReduce must implement. Classes implementing this interface must implement methods for serializing and deserializing themselves.
D) 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.

問題與答案：