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最新的 CCAH CCA-470 免費考試真題:

1. You have 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 cluster, which you expect to run a couple of minutes only.
You submit both jobs with the same priority.
Which two best describes how the FIFO Scheduler arbitrates the cluster resources for a job and its tasks?

A) The FIFO Schedule will pass an exception back to the client when Job B is submitted, since all slots on the cluster are in use.
B) Because there is more then a single job on the cluster, the FIFO Scheduler will enforce a limit on the percentage of resources allocated to a particular job at any given time.
C) Tasks are scheduled in the order of their jobs' submission.
D) The order of execution of tasks within a job may vary.
E) Given Jobs A and B submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B.
F) The FIFO Scheduler will give, on average, equal share of the cluster resources over the job lifecycle.

2. Compare the hardware requirements of the NameNode with that of the DataNodes in a Hadoop cluster:

A) The NameNode and DataNodes should have the same hardware configuration.
B) The NameNode requires more memory and no disk drives.
C) The NameNode requires less memory and fewer number of disk drives than the DataNodes.
D) The NameNode requires more memory and requires greater disk capacity than the DataNodes.
E) The NameNode requires more memory but less disk capacity.

3. Which three distcp features can you utilize on a Hadoop cluster?

A) Use distcp to run an internal MapReduce job to copy files.
B) Use distcp to copy physical blocks from the source to the target destination in your cluster.
C) Use distcp to copy HBase table files.
D) Use distcp to copy files only between two clusters or more. You cannot use distcp to copy data between directories inside the same cluster.
E) Use distcp to copy data between directories inside the same cluster.

4. Which two features does Kerberos security add to a Hadoop cluster?

A) Encryption on all remote procedure calls (RPCs)
B) User authentication on all remote procedure calls (RPcs)
C) Root access to the cluster for users hdfs and mapred but non-root acess clients
D) Authentication for user access to the cluster against a central server
E) Encryption for data on disk ("at rest")

5. What is the Secondary NameNode?

A) A process purely intended to perform backups of the NameNode.
B) A data channel between the primary name node and the tertiary NameNode.
C) An alternate data channel for clients to reach HDFS, should the NameNode become too busy.
D) A standby NameNode, for high availability.
E) A process that performs a checkpoint operation on the files produced by the NameNode.

問題與答案：