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

1. Assuming a large properly configured multi-rack Hadoop cluster, which scenario should not result in loss of HDFS data assuming the default replication factor settings?

A) Seventy percent of DataNodes simultaneously fail.
B) Multiple racks simultaneously fail.
C) All DataNodes simultaneously fail.
D) An entire rack fails.
E) Ten percent of DataNodes simultaneously fail.

2. Which daemon spawns child JVMs to perform MapReduce processing?

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

3. Your cluster implements HDFS High Availability (HA). You two NameNodes are named nn01 and nn02. What occurs when you execute the command:
Hdfs haadmin -failover nn01 nn02

A) Nn01 is fenced, and nn02 becomes the active NameNode
B) Nn01 is fenced, and nn01 becomes the active NameNode
C) Nn01 becomes the standby NameNode and nn02 becomes the active NameNode
D) nn02 becomes the standby NameNode and nn02 becomes the active NameNode

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

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

5. A client wants to read a file from HDFS. How does the data get from the DataNodes to the client?

A) The NameNode reads the blocks from the DataNodes, and caches them. Then, the application reads the blocks from the NameNode.
B) The application reads the blocks directly from the DataNodes.
C) The blocks are sent to a single DataNode, then the application reads the blocks from that Data Node.

Solutions: