最新的CCAH認證 CCA-505考試題庫

問題1

Your Hadoop cluster contains nodes in three racks. You have NOT configured the dfs.hosts property in the NameNode's configuration file. What results?

A. Presented with a blank dfs.hosts property, the NameNode will permit DatNode specified in mapred.hosts to join the cluster

B. Any machine running the DataNode daemon can immediately join the cluster

C. No new nodes can be added to the cluster until you specify them in the dfs.hosts file

D. The NameNode will update the dfs.hosts property to include machine running DataNode daemon on the next NameNode reboot or with the command dfsadmin -refreshNodes

正確答案: B

問題2

You want a 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 o in core-site.xml

D. Set vm.swappiness to o in /etc/sysctl.conf

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

正確答案: D

問題3

You are working on a project where you need to chain together MapReduce, Pig jobs. You also needs the ability to use forks, decision, and path joins. Which ecosystem project should you use to perform these actions?

A. Zookeeper

B. Oozie

C. HBase

D. HUE

E. Sqoop

正確答案: B

問題4

Your cluster implements HDFS High Availability (HA). Your two NameNodes are named nn01 and nn02. What occurs when you execute the command: hdfs haadmin -failover nn01 nn02

A. nn02 is fenced, and nn01 becomes the active NameNode

B. nn01 becomes the standby NamNode and nn02 becomes the active NAmeNode

C. nn02 becomes the standby NameNode and nn01 becomes the active NameNode

D. nn01 is fenced, and nn02 becomes the active NameNode

正確答案: D

說明：（僅 VCESoft 成員可見）

問題5

You are migrating a cluster from MapReduce version 1 (MRv1) to MapReduce version2 (MRv2) on YARN. To want to maintain your MRv1 TaskTracker slot capacities when you migrate. What should you do?

A. Configure mapred.tasktracker.map.tasks.maximum and mapred.tasktracker.reduce.tasks.maximum ub yarn.site.xml to match your cluster's configured capacity set by yarn.scheduler.minimum-allocation

B. You don't need to configure or balance these properties in YARN as YARN dynamically balances resource management capabilities on your cluster

C. Configure yarn.applicationmaster.resource.memory-mb and yarn.applicationmaster.cpuvcores so that ApplicationMaster container allocations match the capacity you require.

D. Configure yarn.nodemanager.resource.memory-mb and yarn.nodemanager.resource.cpu-vcores to match the capacity you require under YARN for each NodeManager

正確答案: D

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