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問題 #1

Which describes how a client reads a file from HDFS?

A. The client contacts the NameNode for the block location(s). The NameNode contacts the DataNode that holds the requested data block. Data is transferred from the DataNode to the NameNode, and then from the NameNode to the client.
B. The client contacts the NameNode for the block location(s). The NameNode then queries the DataNodes for block locations. The DataNodes respond to the NameNode, and the NameNode redirects the client to the DataNode that holds the requested data block(s). The client then reads the data directly off the DataNode.
C. The client queries the NameNode for the block location(s). The NameNode returns the block location(s) to the client. The client reads the data directory off the DataNode(s).
D. The client queries all DataNodes in parallel. The DataNode that contains the requested data responds directly to the client. The client reads the data directly off the DataNode.

問題 #2

You need to move a file titled "weblogs" into HDFS. When you try to copy the file, you can't. You know you have ample space on your DataNodes. Which action should you take to relieve this situation and store more files in HDFS?

A. Decrease the block size on your remaining files.
B. Increase the block size on your remaining files.
C. Decrease the block size on all current files in HDFS.
D. Increase the amount of memory for the NameNode.
E. Increase the number of disks (or size) for the NameNode.
F. Increase the block size on all current files in HDFS.

問題 #3

When is the earliest point at which the reduce method of a given Reducer can be called?

A. As soon as at least one mapper has finished processing its input split.
B. Not until all mappers have finished processing all records.
C. It depends on the InputFormat used for the job.
D. As soon as a mapper has emitted at least one record.

問題 #4

In the reducer, the MapReduce API provides you with an iterator over Writable values. What does calling the next () method return?

A. It returns a reference to a Writable object from an object pool.
B. It 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.
C. It returns a reference to a different Writable object time.
D. It returns a reference to the same Writable object each time, but populated with different data.
E. It returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.

問題 #5

You want to run Hadoop jobs on your development workstation for testing before you submit them to your production cluster. Which mode of operation in Hadoop allows you to most closely simulate a production cluster while using a single machine?

A. Run simldooop, the Apache open-source software for simulating Hadoop clusters.
B. Run the hadoop command with the -jt local and the -fs file:///options.
C. Run all the nodes in your production cluster as virtual machines on your development workstation.
D. Run the DataNode, TaskTracker, NameNode and JobTracker daemons on a single machine.

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