Free CCA-500 Exam Dumps

Question 6

A slave node in your cluster has 4 TB hard drives installed (4 x 2TB). The DataNode is configured to store HDFS blocks on all disks. You set the value of the dfs.datanode.du.reserved parameter to 100 GB. How does this alter HDFS block storage?

A. 25GB on each hard drive may not be used to store HDFS blocks
B. 100GB on each hard drive may not be used to store HDFS blocks
C. All hard drives may be used to store HDFS blocks as long as at least 100 GB in total is available on the node
D. A maximum if 100 GB on each hard drive may be used to store HDFS blocks

Correct Answer:B

Question 7

Table schemas in Hive are:

A. Stored as metadata on the NameNode
B. Stored along with the data in HDFS
C. Stored in the Metadata
D. Stored in ZooKeeper

Correct Answer:B

Question 8

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

A. Automatically configures permissions for log files at & MAPRED_LOG_DIR/userlogs
B. Creates users for hdfs and mapreduce to facilitate role assignment
C. Creates directories for temp, hdfs, and mapreduce with the correct permissions
D. Creates a set of pre-configured Kerberos keytab files and their permissions
E. Creates and configures your kdc with default cluster values

Correct Answer:B

Question 9

Your cluster is running MapReduce version 2 (MRv2) on YARN. Your ResourceManager is configured to use the FairScheduler. Now you want to configure your scheduler such that a new user on the cluster can submit jobs into their own queue application submission. Which configuration should you set?

A. You can specify new queue name when user submits a job and new queue can be created dynamically if the property yarn.scheduler.fair.allow-undecleared-pools = true
B. Yarn.scheduler.fair.user.fair-as-default-queue = false and yarn.scheduler.fair.allow- undecleared-pools = true
C. You can specify new queue name when user submits a job and new queue can be created dynamically if yarn .schedule.fair.user-as-default-queue = false
D. You can specify new queue name per application in allocations.xml file and have new jobs automatically assigned to the application queue

Correct Answer:A

Question 10

You have recently converted your Hadoop cluster from a MapReduce 1 (MRv1) architecture to MapReduce 2 (MRv2) on YARN architecture. Your developers are accustomed to specifying map and reduce tasks (resource allocation) tasks when they run jobs: A developer wants to know how specify to reduce tasks when a specific job runs. Which method should you tell that developers to implement?

A. MapReduce version 2 (MRv2) on YARN abstracts resource allocation away from the idea of “tasks” into memory and virtual cores, thus eliminating the need for a developer to specify the number of reduce tasks, and indeed preventing the developer from specifying the number of reduce tasks.
B. In YARN, resource allocations is a function of megabytes of memory in multiples of 1024m
C. Thus, they should specify the amount of memory resource they need by executing –D mapreduce-reduces.memory-mb-2048
D. In YARN, the ApplicationMaster is responsible for requesting the resource required for a specific launc
E. Thus, executing –D yarn.applicationmaster.reduce.tasks=2 will specify that the ApplicationMaster launch two task contains on the worker nodes.
F. Developers specify reduce tasks in the exact same way for both MapReduce version 1 (MRv1) and MapReduce version 2 (MRv2) on YAR
G. Thus, executing –D mapreduce.job.reduces-2 will specify reduce tasks.
H. In YARN, resource allocation is function of virtual cores specified by the ApplicationManager making requests to the NodeManager where a reduce task is handeled by a single container (and thus a single virtual core). Thus, the developer needs to specify the number of virtual cores to the NodeManager by executing –p yarn.nodemanager.cpu-vcores=2

Correct Answer:D