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

1. On a cluster running MapReduce v1 (MRv1), the value of the mapred.tasktracker.map.tasks.maximum configuration parameter in the mapred-site.xml file should be set to:

A) Half the number of the maximum number of Reduce tasks which can run simultaneously on an individual node.
B) The maximum number of Map tasks which can run on the cluster as a whole.
C) Half the number of the maximum number of Reduce tasks which can run on the cluster as a whole.
D) The maximum number of Map tasks can run simultaneously on an individual node.
E) The same value on each slave node.

2. For a MapReduce job, on a cluster running MapReduce v1 (MRv1), what's the relationship between tasks and task templates?

A) There are always exactly as many task attempts as there are tasks.
B) There are always at most as many tasks attempts as there are tasks.
C) There are always at least as many task attempts as there are tasks.
D) The developer sets the number of task attempts on job submission.

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

4. What two processes must you do if you are running a Hadoop cluster with a single NameNode and six DataNodes, and you want to change a configuration parameter so that it affects all six DataNodes.

A) You must modify the configuration files on each of the six DataNode machines.
B) You must modify the configuration files on only one of the DataNode machine
C) You must restart all six DataNode daemons to apply the changes to the cluster.
D) You must restart the NameNode daemon to apply the changes to the cluster
E) You don't need to restart any daemon, as they will pick up changes automatically.
F) You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes.

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

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

Solutions: