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

1. A client wants to read a file from HDFS. How does the data get from the DataNodes to the client?

A) The blocks are sent to a single DataNode, then the application reads the blocks from that Data Node.
B) The NameNode reads the blocks from the DataNodes, and caches them. Then, the application reads the blocks from the NameNode.
C) The application reads the blocks directly from the DataNodes.

2. How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?

A) They must not be formatted - - HDFS will format the filesystem automatically
B) They must be formatted as HDFS
C) They may be formatted in nay Linux filesystem
D) They must be formatted as either ext3 or ext4

3. You set up the Hadoop cluster using NameNode Federation. One NameNode manages the/users namespace and one NameNode manages the/data namespace. What happens when client tries to write a file to/reports/myreport.txt?

A) The file successfully writes to /report/myreport.txt. The metadata for the file is managed by the first NameNode to which the client connects.
B) The file successfully writes to /users/reports/myreports/myreport.txt.
C) The client throws an exception.
D) The file writes fails silently; no file is written, no error is reported.

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

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

5. 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) 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.
B) 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.
C) 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.
D) The HDFS filesystem is corrupt until the administrator re adds the DataNode to the cluster. The warnings associated with the event should be reported.

Solutions: