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

1. Identity four pieces of cluster information that are stored on disk on the NameNode?

A) File permissions of the files in HDFS.
B) An edit log of changes that have been made since the last snapshot of the NameNode.
C) A catalog of DataNodes and the blocks that are stored on them.
D) Names of the files in HDFS.
E) The status of the heartbeats of each DataNode.
F) An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.
G) The directory structure of the files in HDFS.

2. Which three processes does HDFS High Availability (HA) enable on your cluster?

A) Shut one NameNode down for maintenance without halting the cluster
B) Configure unlimited hot standby NameNode.
C) Write data to two clusterssimultaneously
D) Automatically 'fail over' between NameNodes if one goes down
E) Manually 'fail over' between NameNodes

3. What action occurs automatically on a cluster when a DataNode is marked as dead?

A) The replication factor of the files which had blocks stored on the dead DataNode is temporarily reduced, until the dead DataNode is recovered and returned to the cluster.
B) The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
C) The NameNode informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.
D) The next time a client submits job that requires blocks from the dead DataNode, the JobTracker receives no heart beats from the DataNode. The JobTracker tells the NameNode that the DataNode is dead, which triggers block re-replication on the cluster.

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

5. Identify the function performed by the Secondary NameNode daemon on a cluster configured to run with a single NameNode.

A) In this configuration, the Secondary NameNode servers as alternate data channel for clients to reach HDFS, should the NameNode become too busy.
B) In this configuration, the Secondary NameNode is standby NameNode, ready to failover and provide high availability.
C) In this configuration, the Secondary NameNode performs deal-time backups of the NameNode.
D) In this configuration, the Secondary NameNode performs a checkpoint operation on the files by the NameNode.

Solutions: