最新的Cloudera CCA-470免費考試真題

問題1

Under which of the following scenarios would it be most appropriate to consider using faster (e.g., 10 Gigabit) Ethernet as the network fabric for your Hadoop cluster?

A. When the typical workload consumes a large amount of input data, relative to the entire Canada of HDFS.

B. When the typical workload generates a large amount of output data, significantly larger than the amount of intermediate data.

C. When the typical workload generates a large amount of intermediate data, on the order of the input data itself.

D. When the typical workload consists of processor-intensive tasks.

正確答案: B

問題2

You are running a Hadoop cluster with NameNode on host mynamenode, a secondary NameNode on host mysecondary and DataNodes.
Which best describes how you determine when the last checkpoint happened?

A. Execute hdfs dfsadmin -report on the command line in and look at the Last Checkpoint information.

B. Connect to the web UI of the NameNode (http://mynamenode:50070/) and look at the "Last Checkpoint" information

C. Execute hdfs dfsadmin -saveNameSpace on the command line which returns to you the last checkpoint value in fstime file.

D. Connect to the web UI of the Secondary NameNode (http://mysecondarynamenode:50090) and look at the "Last Checkpoint" information

正確答案: D

說明：（僅 Fast2test 成員可見）

問題3

On a cluster running MapReduce v1 (MRv1), a MapReduce job is given a directory of 10 plain text as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?

A. We cannot say; the number of Mappers is determined by the developer

B. 30

C. 10

D. 1

正確答案: B

問題4

How does HDFS Federation help HDFS Scale horizontally?

A. HDFS Federation reduces the load on any single NameNode by using the multiple, independent NameNode to manage individual pars of the filesystem namespace.

B. HDFS Federation allows the Standby NameNode to automatically resume the services of an active NameNode.

C. HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the NameNode as a single-point-of-failure.

D. HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster administrator to split the Block Storage outside the local cluster.

正確答案: A

說明：（僅 Fast2test 成員可見）

問題5

You set up the Hadoop cluster using NameNode Federation. One NameNode manages the/users namespace and one NameNode manages the/data namespace. What happens when client tries to write a file to/reports/myreport.txt?

A. The file successfully writes to /users/reports/myreports/myreport.txt.

B. The file successfully writes to /report/myreport.txt. The metadata for the file is managed by the first NameNode to which the client connects.

C. The file writes fails silently; no file is written, no error is reported.

D. The client throws an exception.

正確答案: B

說明：（僅 Fast2test 成員可見）

問題6

For a MapReduce job, what's the relationship between tasks and task attempts?

A. There are always at least as many task attempts as there are tasks.

B. There are always at most as many task attempts as there are tasks.

C. There are always exactly as many task attempts as there are tasks.

正確答案: A

問題7

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.

正確答案: D

說明：（僅 Fast2test 成員可見）

問題8

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.

正確答案: C

說明：（僅 Fast2test 成員可見）

問題9

You are a Hadoop cluster with a NameNode on host mynamenode. What are two ways to determine available HDFS space in your cluster?

A. Run hadoop dfsadmin -SpaceQuota and subtract HDFS Used from Configured Capacity.

B. Run hadoop dfsadmin -report and locate the DFS Remaining value.

C. Run hadoop fs -du/and locate the DFS Remaining value.

D. Connect to http://mynamemode:50070/ and locate the DFS Remaining value.

正確答案: B,C

最新的Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) - CCA-470免費考試真題

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