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

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

2. Which three distcp features can you utilize on a Hadoop cluster?

A) Use distcp to copy physical blocks from the source to the target destination in your cluster.
B) Use distcp to copy data between directories inside the same cluster.
C) Use distcp to run an internal MapReduce job to copy files.
D) Use distcp to copy files only between two clusters or more. You cannot use distcp to copy data between directories inside the same cluster.
E) Use distcp to copy HBase table files.

3. It is recommended that you run the HDFS balancer periodically. Why? (Choose 3)

A) To ensure that all blocks in the cluster are 128MB in size.
B) To help HDFS deliver consistent performance under heavy loads.
C) To ensure that there is consistent disk utilization across the DataNodes.
D) To improve data locality for MapReduce tasks.
E) To ensure that there is capacity in HDTS for additional data.

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

5. Identify which two daemons typically run each slave node in a Hadoop cluster running MapReduce v1 (MRv1)

A) JobTracker
B) DataNode
C) NodeManager
D) TaskTracker
E) NameNode
F) Secondary NameNode

Solutions: