CCA-470：最新的Cloudera認證CCA-470考題，Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH)認證

問題1
How does the HDFS architecture provide redundancy?

A. Storing multiple replicas of data blocks on different DataNodes.

B. Reliance on RAID at each datanode.

C. DataNodes make copies of their data blocks, and put them on different local disks.

D. Reliance on SAN devices as a DataNode interface.

正確答案: A

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問題2
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 consists of processor-intensive tasks.

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 consumes a large amount of input data, relative to the entire Canada of HDFS.

正確答案: B

問題3
What metadata is stored on a DataNode when a block is written to it?

A. None. Only the block itself is written.

B. Node location of each block belonging to the same namespace.

C. Information on the file's location in HDFS.

D. Checksums for the data in the block, as a separate file.

正確答案: B

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問題4
You install Cloudera Manager on a cluster where each host has 1 GB of RAM. All of the services show their status as concerning. However, all jobs submitted complete without an error.
Why is Cloudera Manager showing the concerning status KM the services?

A. A slave node's disk ran out of space

B. DataNode service instance has crashed.

C. The slave nodes are swapping.

D. The slave nodes, haven't sent a heartbeat in 60 minutes

正確答案: D

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問題5
Hadoop provider web interface can be used for all of the following EXCEPT: (choose 1)

A. Keeping track of processor and memory utilization on each individual slave node.

B. Browsing files in HDFS.

C. Keeping track of the number of files and directories stored in HDFS.

D. Keeping track of tasks running on each individual slave node.

E. Keeping track of jobs running on the cluster.

正確答案: D

問題6
Cluster Summary
45 files and directories, 12 blocks = 57 total. Heap Size is 15.31 MB / 193.38MB(7%)

Refer to the above screenshot.
You configure the Hadoop cluster with seven DataNodes and the NameNode's web UI displays the details shown in the exhibit.
What does this tells you?

A. The DataNode JVM on one host is not active.

B. The HDFS cluster is in the safe mode.

C. One physical host crashed.

D. Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.

正確答案: B

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問題7
It is recommended that you run the HDFS balancer periodically. Why? (Choose 3)

A. To help HDFS deliver consistent performance under heavy loads.

B. To improve data locality for MapReduce tasks.

C. To ensure that all blocks in the cluster are 128MB in size.

D. To ensure that there is consistent disk utilization across the DataNodes.

E. To ensure that there is capacity in HDTS for additional data.

正確答案: A,D,E

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問題8
What does CDH packaging do on install to facilitate Kerberos security setup?

A. Automatically configure permissions for log files at $MAPPED_LOG_DIR/userlogs

B. Creates directories for temp, hdfs, and mapreduce with correct permissions.

C. Creates users for hdfs and mapreduce to facilitate role assignment.

D. Creates a set of pre-configured Kerberos keytab files and their permissions.

E. Creates and configures you kdc with default cluster values.

正確答案: C

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問題9
The failure of which daemon makes HDFS unavailable on a cluster running MapReduce v1 (MRv1)?

A. NameNode

B. Secondary NameNode

C. DataNode

D. Application Manager

E. Node Manager

F. Resource Manager

正確答案: A

說明：（僅 PDFExamDumps 成員可見）

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