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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. When planning a hadoop cluster, what general rule governs the hardware requirements between master nodes and slave nodes?

A) The master nodes requires more memory but less disk capacity
B) the master nodes requires less memory and fewer number disk drives than the slave nodes
C) The master nodes require more memory and greater disk capacity then the slave nodes
D) The master nodes requires more memory and no disk drives
E) The master and slave nodes should have the same hardware configuration

2. Which three processes does HDFS High Availability (HA) enable on your cluster?

A) Write data to two clusters simultaneously
B) Automatically 'fail over' between NameNodes if one goes down
C) Manually 'fail over' between NameNodes
D) Configure unlimited hot standby NameNode.
E) Shut one NameNode down for maintenance without halting the cluster

3. Your cluster implements hdfs high availability (HA) your two namenodes are named hadoop01 and hadoop02. What occurs when you execute the command:
Sudo -u hdfs haadmin -failover hadoop01 hadoop02

A) Hadoop01 becomes inactive and hadoop02 becomes the active namenode
B) Hadoop01 is fenced, and hadoop02 becomes the active namenode
C) Hadoop02 becomes the standby namenode and hadoop01 becomes the active namenode
D) Hadoop02 is fenced, and hadoop01 becomes active namenode

4. Using hadoop's default settings, how much data will be able to store on your hadoop cluster if it is has 12 nodes with 4TB raw diskspace per node allocated to HDFS storage?

A) Approximately 12TB
B) Approximately 3TB
C) Approximately 48TB
D) Approximately 16TB

5. Each slave node in your cluster has four 2 TB hard drives installed (4x2TB). You set a value of the dfs.du.datanode.received parameter to 100GB on each slave node. How does this alter HDFS block storage?

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

Solutions: