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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

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

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

2. What determines the number of Reduces that run a given MapReduce job on a cluster running MapReduce v1 (MRv1)?

A) It is set by the developer.
B) It is set by the JobTracker based on the amount of intermediate data.
C) It is set and fixed by the cluster administrator in mapred-site.xml. The number set always run for any submitted job.
D) It is set by the Hadoop framework and is based on the number of InputSplits of the job.

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

4. Which two features does Kerberos security add to a Hadoop cluster?

A) User authentication on all remote procedure calls (RPcs)
B) Root access to the cluster for users hdfs and mapred but non-root acess clients
C) Encryption for data on disk ("at rest")
D) Authentication for user access to the cluster against a central server
E) Encryption on all remote procedure calls (RPCs)

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

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

Solutions: