最新的CCAH認證 CCA-500考試題庫

問題1

You want to node to only swap Hadoop daemon data from RAM to disk when absolutely necessary. What should you
do?

A. Delete the /dev/vmswap file on the node

B. Delete the /swapfile file on the node

C. Set the ram.swap parameter to 0 in core-site.xml

D. Delete the /etc/swap file on the node

E. Set vm.swapfile file on the node

正確答案: E

問題2

In CDH4 and later, which file contains a serialized form of all the directory and files inodes in the filesystem, giving the
NameNode a persistent checkpoint of the filesystem metadata?

A. fstime

B. Edits_N-M (where N-M transactions between transaction ID N and transaction ID N)

C. VERSION

D. Fsimage_N (where N reflects transactions up to transaction ID N)

正確答案: D

說明：（僅 VCESoft 成員可見）

問題3

Choose three reasons why should you run the HDFS balancer periodically?

A. To improve data locality MapReduce

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

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

D. To help HDFS deliver consistent performance under heavy loads

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

正確答案: C

說明：（僅 VCESoft 成員可見）

問題4

Your Hadoop cluster is configuring with HDFS and MapReduce version 2 (MRv2) on YARN. Can you configure a worker
node to run a NodeManager daemon but not a DataNode daemon and still have a functional cluster?

A. Yes. The daemon will receive Map tasks only

B. Yes. The daemon will receive data from the NameNode to run Map tasks

C. Yes. The daemon will get data from another (non-local) DataNode to run Map tasks

D. Yes. The daemon will receive Reducer tasks only

正確答案: B

問題5

Your cluster's mapred-start.xml includes the following parameters
<name>mapreduce.map.memory.mb</name>
<value>4096</value>
<name>mapreduce.reduce.memory.mb</name>
<value>8192</value>
And any cluster's yarn-site.xml includes the following parameters
<name>yarn.nodemanager.vmen-pmen-ration</name>
<value>2.1</value>
What is the maximum amount of virtual memory allocated for each map task before YARN will kill its Container?

A. 8.9GB

B. 17.2 GB

C. 24.6 GB

D. 8.2 GB

E. 4 GB

正確答案: D

問題6

Your company stores user profile records in an OLTP databases. You want to join these records with web server logs
you have already ingested into the Hadoop file system. What is the best way to obtain and ingest these user records?

A. Ingest with Pig's LOAD command

B. Ingest with Hadoop streaming

C. Ingest using Hive's IQAD DATA command

D. Ingest with sqoop import

E. Ingest using the HDFS put command

正確答案: A,D

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