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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. 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 16TB
B) Approximately 3TB
C) Approximately 48TB
D) Approximately 12TB

2. You have cluster running with the FIFO Scheduler enabled. You submit a large job A to the cluster, which you expect to run for one hour. Then, you submit job B to cluster, which you expect to run a couple of minutes only.
You submit both jobs with the same priority.
Which two best describes how the FIFO Scheduler arbitrates the cluster resources for a job and its tasks?

A) Because there is more then a single job on the cluster, the FIFO Scheduler will enforce a limit on the percentage of resources allocated to a particular job at any given time.
B) Given Jobs A and B submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B.
C) The FIFO Schedule will pass an exception back to the client when Job B is submitted, since all slots on the cluster are in use.
D) The order of execution of tasks within a job may vary.
E) The FIFO Scheduler will give, on average, equal share of the cluster resources over the job lifecycle.
F) Tasks are scheduled in the order of their jobs' submission.

3. You configure you cluster with HDFS High Availability (HA) using Quorum-Based storage. You do
not implement HDFS Federation.
What is the maximum number of NameNodes daemon you should run on you cluster in order to avoid a "split-brain" scenario with your NameNodes?

A) One active NameNode and one Standby NameNode
B) Unlimited. HDFS High Availability (HA) is designed to overcome limitations on the number of NameNodes you can deploy.
C) Two active NameNodes and two Standby NameNodes
D) Two active NameNodes and one Standby NameNode

4. What is the recommended disk configuration for slave nodes in your Hadoop cluster with 6 x 2 TB hard drives?

A) RAID 10
B) JBOD
C) RAID 1+0
D) RAID 5

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

Solutions: