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1. You use the hadoop fs -put command to write a 300 MB file using an HDFS block size of 64 MB. Just after this command has finished writing 200 MB of this file, what would another user see when trying to access this file?
A) They would see the content of the file through the last completed block.
B) They would see the current state of the file, up to the last bit written by the command.
C) They would see Hadoop throw an concurrentFileAccessException when they try to access this file.
D) They would see no content until the whole file is written and closed.
2. 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) DataNode
C) JobTracker
D) TaskTracker
E) Secondary NameNode
3. Given a Mapper, Reducer, and Driver class packaged into a jar, which is the correct way of submitting the job to the cluster?
A) hadoop jar MyJar.jar MyDriverClass inputdir outputdir
B) jar MyJar.jar MyDriverClass inputdir outputdir
C) hadoop jar class MyJar.jar MyDriverClass inputdir outputdir
D) jar MyJar.jar
4. You need to create a GUI application to help your company's sales people add and edit customer information. Would HDFS be appropriate for this customer information file?
A) Yes, because HDFS is optimized for random access writes.
B) No, because HDFS can only be accessed by MapReduce applications.
C) No, because HDFS is optimized for write-once, streaming access for relatively large files.
D) Yes, because HDFS is optimized for fast retrieval of relatively small amounts of data.
5. You have a large dataset of key-value pairs, where the keys are strings, and the values are integers. For each unique key, you want to identify the largest integer. In writing a MapReduce program to accomplish this, can you take advantage of a combiner?
A) Yes, as long as all the keys fit into memory on each node.
B) Yes, but the number of unique keys must be known in advance.
C) Yes.
D) Yes, as long as all the integer values that share the same key fit into memory on each node.
E) No, a combiner would not be useful in this case.
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: C | Question # 3 Answer: A | Question # 4 Answer: C | Question # 5 Answer: C |
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