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

1. It is recommended that you run the HDFS balancer periodically. Why? (Choose 3)

A) To improve data locality for MapReduce tasks.
B) To ensure that all blocks in the cluster are 128MB in size.
C) To help HDFS deliver consistent performance under heavy loads.
D) To ensure that there is capacity in HDTS for additional data.
E) To ensure that there is consistent disk utilization across the DataNodes.

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

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

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

4. Which of the following scenarios makes HDFS unavailable?

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

5. You have cluster running with the FIFO Scheduler enabled. You submit a large job A to the cluster, which you expect to run for one hour. Then, you submit job B to cluster, which you expect to run a couple of minutes only.
You submit both jobs with the same priority.
Which two best describes how the FIFO Scheduler arbitrates the cluster resources for a job and its tasks?

A) The order of execution of tasks within a job may vary.
B) The FIFO Scheduler will give, on average, equal share of the cluster resources over the job lifecycle.
C) The FIFO Schedule will pass an exception back to the client when Job B is submitted, since all slots on the cluster are in use.
D) Given Jobs A and B submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B.
E) Because there is more then a single job on the cluster, the FIFO Scheduler will enforce a limit on the percentage of resources allocated to a particular job at any given time.
F) Tasks are scheduled in the order of their jobs' submission.

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