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最新的 HCAHD Apache-Hadoop-Developer 免費考試真題:

1. What is the term for the process of moving map outputs to the reducers?

A) Reducing
B) Combining
C) Shuffling and sorting
D) Partitioning

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

3. You have just executed a MapReduce job. Where is intermediate data written to after being emitted from the Mapper's map method?

A) Intermediate data in streamed across the network from Mapper to the Reduce and is never written to disk.
B) Into in-memory buffers on the TaskTracker node running the Reducer that spill over and are written into HDFS.
C) Into in-memory buffers on the TaskTracker node running the Mapper that spill over and are written into HDFS.
D) Into in-memory buffers that spill over to the local file system of the TaskTracker node running the Mapper.
E) Into in-memory buffers that spill over to the local file system (outside HDFS) of the TaskTracker node running the Reducer

4. Which HDFS command displays the contents of the file x in the user's HDFS home directory?

A) hadoop fs -Is x
B) hadoop fs -cp x
C) hadoop fs -cat x
D) hdfs fs -get x

5. What does the following command do?
register '/piggyban):/pig-files.jar';

A) Invokes the user-defined functions contained in the jar file
B) Specifies the location of the JAR file containing the user-defined functions
C) Assigns a name to a user-defined function or streaming command
D) Transforms Pig user-defined functions into a format that Hive can accept

問題與答案：