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

1. Your existing Hadoop cluster has 30 slave nodes, each of which has 4 x 2T hard drives. You plan to add another 10 nodes. How much disk space can your new nodes contain?

A) The new nodes can contain any amount of disk space
B) The new nodes must all contain 8TB of disk space, but it does not matter how the disks are configured
C) The new nodes must all contain 4 x 2TB hard drives
D) The new nodes cannot contain more than 8TB of disk space

2. Choose which best describe a Hadoop cluster's block size storage parameters once you set the HDFS default block size to 64MB?

A) The block size of files in the cluster can be determined as the block is written.
B) The block size of files in the duster will all at least be 64MB.
C) The block size of files in the cluster will all be the exactly 64MB.
D) The block size of files in the Cluster will all be multiples of 64M

3. Your Hadoop cluster contains nodes in three racks. Choose which scenario results if you leave the dfs.hosts property in the NameNode's configuration file empty (blank)?

A) No new can be added to the cluster until you specify them in the dfs.hosts file.
B) Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in mapred.hosts to join the cluster.
C) The NameNode will update dfs.hosts property to include machines running the DataNode daemon on the next NameNode reboot or with a dfsadmin -refreshNodes.
D) Any machine running the DataNode daemon can immediately join the cluster.

4. You are planning a Hadoop duster, and you expect to be receiving just under 1TB of data per week which will be stored on the cluster, using Hadoop's default replication. You decide that your slave nodes will be configured with 4 x 1TB disks.
Calculate how many slave nodes you need to deploy at a minimum to store one year's worth of data.

A) 100 slave nodes
B) 50 slave nodes
C) 100 slave nodes
D) 10 slave nodes

5. You have a 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 the cluster, which you expect to run a couple of minutes only. Let's assume both jobs are running at the same priority.
How does the FIFO scheduler execute the jobs? (Choose 3)

A) Given jobs A and B submitted in that order, all tasks from job A will be scheduled before all tasks from job B.
B) The order of execution of tasks within a job may vary.
C) When a job is submitted, all tasks belonging to that job are scheduled.
D) Since job B needs only a few tasks, if might finish before job A completes.

Solutions:

Question # 1 Answer: A

Question # 2 Answer: C

Question # 3 Answer: A

Question # 4 Answer: B

Question # 5 Answer: A,B,C