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

1. Your Hadoop cluster has 25 nodes with a total of 100 TB (4 TB per node) of raw disk space allocated HDFS storage. Assuming Hadoop's default configuration, how much data will you be able to store?

A) Approximately 100TB
B) Approximately 33 TB
C) Approximately 25TB
D) Approximately 10TB

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

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

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

4. How does the NameNode know DataNodes are available on a cluster running MapReduce v1 (MRv1)

A) The NameNode send a broadcast across the network when it first starts, and DataNodes respond.
B) DataNodes listed in the dfs.hosts file. The NameNode uses as the definitive list of available DataNodes.
C) The NameNode broadcasts a heartbeat on the network on a regular basis, and DataNodes respond.
D) DataNodes heartbeat in the master on a regular basis.

5. What metadata is stored on a DataNode when a block is written to it?

A) Checksums for the data in the block, as a separate file.
B) None. Only the block itself is written.
C) Node location of each block belonging to the same namespace.
D) Information on the file's location in HDFS.

Solutions: