Cloudera Certified Administrator for Apache Hadoop (CCAH) CDH5 Upgrade Exam: CCA-505

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 a cluster?

A. Nothing, other than ensuring that DNS (or /etc/hosts files on all machines) contains am entry for the new node.

B. Restart the NameNode and ResourceManager deamons and resubmit any running jobs

C. Increase the value of dfs.number.of.needs in hdfs-site.xml

D. Add a new entry to /etc/nodes on the NameNode host.

E. Restart the NameNode daemon.

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 becomes the standby NameNode and nn01 becomes the active NameNode

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

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

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

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. VERSION

C. Fsimage_N (Where N reflects all transactions up to transaction ID N)

D. Edits_N-M (Where N-M specifies transactions between transactions ID N and transaction ID N)