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

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

A) The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
B) 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.
C) 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.
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.

3. When determining the most appropriate ratio of processor cores to disk drives for a Hadoop cluster, what are the considerations?

A) Disk drives per core without consideration to workload types
B) Disk drives per machine, nothing else matters.
C) Processors and disk drives per machine, the workload doesn't matter
D) Processor core counts and workload type, the ratio doesn't matter
E) Disk drives per core and workload types

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

5. You are planning a Hadoop duster, and you expect to be receiving just under 1TB of data per week which will be stored on the cluster, using Hadoop's default replication. You decide that your slave nodes will be configured with 4 x 1TB disks.
Calculate how many slave nodes you need to deploy at a minimum to store one year's worth of data.

A) 50 slave nodes
B) 100 slave nodes
C) 100 slave nodes
D) 10 slave nodes

Solutions: