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

1. Identify the function performed by the Secondary NameNode daemon on a cluster configured to run with a single NameNode.

A) In this configuration, the Secondary NameNode is standby NameNode, ready to failover and provide high availability.
B) In this configuration, the Secondary NameNode performs deal-time backups of the NameNode.
C) In this configuration, the Secondary NameNode performs a checkpoint operation on the files by the NameNode.
D) In this configuration, the Secondary NameNode servers as alternate data channel for clients to reach HDFS, should the NameNode become too busy.

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

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

3. Someone in your data center unplugs a slave node by accident. Users of the cluster notice via the Hadoop Web UI that the cluster size has shrunken and express concerns about data loss and HDFS performance. The replication factor of all the files in the cluster is unchanged from the default of 3. What can you tell the users?

A) After identifying the outage, the NameNode will naturally re-replicate the data and there will be no data loss. The administrator can re-add the DataNode at any time. The client can disregard warnings concerned with this event. Data will be under-replicated but will become properly replicated over time.
B) The NameNode will identify the outage and re-replicate the data when the clients receive connection failures to the DataNode, so the end users can disregard such warnings.
C) The HDFS filesystem is corrupt until the administrator re adds the DataNode to the cluster. The warnings associated with the event should be reported.
D) The NameNode will re replicate the data after the administrator issues a special command. The data is not lost but is underreplicated until the administrator issues this command.

4. For each job, the Hadoop framework generates task log files. Where are Hadoop's task log files stored?

A) On the local disk of the slave node running the task.
B) Cached on the local disk of the slave node running the task, then purged immediately upon task completion.
C) In HDFS, in the directory of the user who generates the job.
D) Cached on the local disk of the slave node running the task, then copied into HDFS.

5. How does the HDFS architecture provide redundancy?

A) DataNodes make copies of their data blocks, and put them on different local disks.
B) Reliance on RAID at each datanode.
C) Reliance on SAN devices as a DataNode interface.
D) Storing multiple replicas of data blocks on different DataNodes.

Solutions: