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

1. What information is stored on disk on the NameNode? (Choose 4)

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

2. How does HDFS Federation help HDFS Scale horizontally?

A) HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster administrator to split the Block Storage outside the local cluster.
B) HDFS Federation reduces the load on any single NameNode by using the multiple, independent NameNode to manage individual pars of the filesystem namespace.
C) HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the NameNode as a single-point-of-failure.
D) HDFS Federation allows the Standby NameNode to automatically resume the services of an active NameNode.

3. You are running a Hadoop cluster with NameNode on host mynamenode, a secondary NameNode on host mysecondary and DataNodes.
Which best describes how you determine when the last checkpoint happened?

A) Execute hdfs dfsadmin -report on the command line in and look at the Last Checkpoint information.
B) Connect to the web UI of the NameNode (http://mynamenode:50070/) and look at the "Last Checkpoint" information
C) Connect to the web UI of the Secondary NameNode (http://mysecondarynamenode:50090) and look at the "Last Checkpoint" information
D) Execute hdfs dfsadmin -saveNameSpace on the command line which returns to you the last checkpoint value in fstime file.

4. What happens if a Mapper on one node goes into an infinite loop while running a MapReduce job?

A) After a period of time, the JobTracker will restart the TaskTracker on the node on which the map task is running
B) The Mapper will run indefinitely; the TaskTracker must be restarted to kill it
C) The job will immediately fail.
D) After a period of time, the TaskTracker will kill the Map Task.

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

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

Solutions: