Free CCA-500 Exam Dumps

Question 11

On a cluster running CDH 5.0 or above, you use the hadoop fs –put command to write a 300MB file into a previously empty directory using an HDFS block size of 64 MB. Just after this command has finished writing 200 MB of this file, what would another use see when they look in directory?

A. The directory will appear to be empty until the entire file write is completed on the cluster
B. They will see the file with a ._COPYING_ extension on its nam
C. If they view the file, they will see contents of the file up to the last completed block (as each 64MB block is written, that block becomes available)
D. They will see the file with a ._COPYING_ extension on its nam
E. If they attempt to view the file, they will get a ConcurrentFileAccessException until the entire file write is completed on the cluster
F. They will see the file with its original nam
G. If they attempt to view the file, they will get a ConcurrentFileAccessException until the entire file write is completed on the cluster

Correct Answer:B

Question 12

Which two features does Kerberos security add to a Hadoop cluster?(Choose two)

A. User authentication on all remote procedure calls (RPCs)
B. Encryption for data during transfer between the Mappers and Reducers
C. Encryption for data on disk (“at rest”)
D. Authentication for user access to the cluster against a central server
E. Root access to the cluster for users hdfs and mapred but non-root access for clients

Correct Answer:AD

Question 13

Assuming a cluster running HDFS, MapReduce version 2 (MRv2) on YARN with all settings at their default, what do you need to do when adding a new slave node to cluster?

A. Nothing, other than ensuring that the DNS (or/etc/hosts files on all machines) contains any entry for the new node.
B. Restart the NameNode and ResourceManager daemons and resubmit any running jobs.
C. Add a new entry to /etc/nodes on the NameNode host.
D. Restart the NameNode of dfs.number.of.nodes in hdfs-site.xml

Correct Answer:A
http://wiki.apache.org/hadoop/FAQ#I_have_a_new_node_I_want_to_add_to_a_running_H adoop_cluster.3B_how_do_I_start_services_on_just_one_node.3F

Question 14

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

A. Execute hdfs namenode –report on the command line and look at the Last Checkpoint information
B. Execute hdfs dfsadmin –saveNamespace on the command line which returns to you the last checkpoint value in fstime file
C. Connect to the web UI of the Secondary NameNode (http://mysecondary:50090/) and look at the “Last Checkpoint” information
D. Connect to the web UI of the NameNode (http://mynamenode:50070) and look at the “Last Checkpoint” information

Correct Answer:C
Reference:https://www.inkling.com/read/hadoop-definitive-guide-tom-white-3rd/chapter- 10/hdfs

Question 15

You are configuring your cluster to run HDFS and MapReducer v2 (MRv2) on YARN. Which two daemons needs to be installed on your cluster’s master nodes?(Choose two)

A. HMaster
B. ResourceManager
C. TaskManager
D. JobTracker
E. NameNode
F. DataNode

Correct Answer:BE