Cloudera CCAH CCA-470

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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:

1. What information is stored on disk on the NameNode? (Choose 4)

A) Names of the files in HDFS.
B) An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.
C) The directory structure of the files in HDFS.
D) The status of the heartbeats of each DataNode.
E) A catalog of DataNodes and the blocks that are stored on them.
F) File permissions of the files in HDFS.
G) An edit log of changes that have been made since the last backup of the NameNode.

2. What would be a reasonable configuration of disk drives in a Hadoop datanode?

A) 48 1.5TB disk drives in a JBOD configuration
B) Four 1TB disk drives in a JBOD configuration
C) One 1TB disk drive
D) 48 1.5 TB disk drives in a RAID configuration
E) Four 1TB disk drives in a RAID configuration

3. Which command does Hadoop offer to discover missing or corrupt HDFS data?

A) Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block.
B) Dskchk
C) The map-only checksum utility,
D) Fsck
E) Du

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

A) Nn01 is fenced, and nn01 becomes the active NameNode
B) Nn01 is fenced, and nn02 becomes the active NameNode
C) nn02 becomes the standby NameNode and nn02 becomes the active NameNode
D) Nn01 becomes the standby NameNode and nn02 becomes the active NameNode

5. Which MapReduce daemon instantiates user code, and executes map and reduce tasks on a cluster running MapReduce v1 (MRv1)?

A) ResourceManager
B) TaskTracker
C) NameNode
D) JobTracker
E) DataNode
F) NodeManager
G) ApplicationMaster

Solutions: