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問題 #1

You have a cluster running with the FIFO scheduler enabled. You submit a large job A to the
cluster which you expect to run for one hour. Then, you submit job B to the cluster, which you expect to run a couple of minutes only. Let's assume both jobs are running at the same priority.
How does the FIFO scheduler execute the jobs? (Choose 3)

A. Since job B needs only a few tasks, if might finish before job A completes.
B. When a job is submitted, all tasks belonging to that job are scheduled.
C. Given jobs A and B submitted in that order, all tasks from job A will be scheduled before all tasks from job B.
D. The order of execution of tasks within a job may vary.

問題 #2

Your cluster Mode size is set to 128MB. A client application (client application A) is writing a 500MB file to HDFS. After client application A has written 300MB of data, another client (client application B) attempts to read the file. What is the effect of a second client requesting a file during a write?

A. Application B can read 256MB of the file
B. Client application on B can read the 300MB that has been written so far.
C. Client application B returns an error
D. Client application B must wait until the entire file has been written, and will then read its entire contents.

問題 #3

For each job, the Hadoop framework generates task log files. Where are Hadoop's task log files stored?

A. Cached on the local disk of the slave node running the task, then purged immediately upon task completion.
B. Cached on the local disk of the slave node running the task, then copied into HDFS.
C. On the local disk of the slave node running the task.
D. In HDFS, in the directory of the user who generates the job.

問題 #4

What happens if a Mapper on one node goes into an infinite loop while running a MapReduce job?

A. After a period of time, the JobTracker will restart the TaskTracker on the node on which the map task is running
B. The Mapper will run indefinitely; the TaskTracker must be restarted to kill it
C. After a period of time, the TaskTracker will kill the Map Task.
D. The job will immediately fail.

問題 #5

The most important consideration for slave nodes in a Hadoop cluster running production jobs that require short turnaround times is:

A. The ratio between the amount of memory and the total storage capacity.
B. The ratio between the number of processor cores and the amount of memory.
C. The ratio between the amount of memory and the number of disk drives.
D. The ratio between the number of processor cores and number of disk drives.
E. The ratio between the number of processor cores and total storage capacity.

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