Cloudera CCAH CCA-470

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付款成功後, 我們的體統將自動通過電子郵箱將你已購買的CCA-470題库(Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH))發送到你的郵箱。（如果在12小時內未收到，請聯繫我們，注意：不要忘記檢查你的垃圾郵件。）

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Cloudera CCA-470 考試大綱主題:

最新的 CCAH CCA-470 免費考試真題：

問題 #1

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

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

問題 #2

What two processes must you do if you are running a Hadoop cluster with a single NameNode and six DataNodes, and you want to change a configuration parameter so that it affects all six DataNodes.

A. You must modify the configuration files on only one of the DataNode machine
B. You must restart all six DataNode daemons to apply the changes to the cluster.
C. You don't need to restart any daemon, as they will pick up changes automatically.
D. You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes.
E. You must restart the NameNode daemon to apply the changes to the cluster
F. You must modify the configuration files on each of the six DataNode machines.

問題 #3

How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?

A. They must be formatted as HDFS
B. They must be formatted as either ext3 or ext4
C. They must not be formatted - - HDFS will format the filesystem automatically
D. They may be formatted in nay Linux filesystem

問題 #4

Your cluster has nodes in seven racks, and you have provided a rack topology script. What is Hadoop's block placement policy, assuming a block replication factor of three?

A. One copy of the block is written to a node in one rack; two copies are written to two nodes in a different rack
B. Because there are seven racks the block is written to a node on each rack
C. All three of the block are written to nodes on the same rack
D. One copy of the block is written to a node in each of three racks

問題 #5

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 Scheduler will give, on average, equal share of the cluster resources over the job lifecycle.
B. 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.
C. Tasks are scheduled in the order of their jobs' submission.
D. The order of execution of tasks within a job may vary.
E. 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.
F. Given Jobs A and B submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B.

問題與答案：