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1. 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.

2. Your client application submits a MapReduce job to your Hadoop cluster. Identify the Hadoop daemon on which the Hadoop framework will look for an available slot schedule a MapReduce operation.

A) NameNode
B) Secondary NameNode
C) DataNode
D) JobTracker
E) TaskTracker

3. Which one of the following statements is FALSE regarding the communication between DataNodes and a federation of NameNodes in Hadoop 2.0?

A) DataNodes send periodic block reports to all the NameNodes.
B) Each DataNode registers with all the NameNodes.
C) Each DataNode receives commands from one designated master NameNode.
D) DataNodes send periodic heartbeats to all the NameNodes.

4. You need to run the same job many times with minor variations. Rather than hardcoding all job configuration options in your drive code, you've decided to have your Driver subclass org.apache.hadoop.conf.Configured and implement the org.apache.hadoop.util.Tool interface.
Indentify which invocation correctly passes.mapred.job.name with a value of Example to Hadoop?

A) hadoop setproperty ("mapred.job.name=Example") MyDriver input output
B) hadoop MyDriver mapred.job.name=Example input output
C) hadoop "mapred.job.name=Example" MyDriver input output
D) hadoop MyDrive -D mapred.job.name=Example input output
E) hadoop setproperty mapred.job.name=Example MyDriver input output

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

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

問題與答案：

問題 #1 答案： A

問題 #2 答案： D

問題 #3 答案： C

問題 #4 答案： D

問題 #5 答案： C