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

1. 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 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.
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.

2. For a MapReduce job, what's the relationship between tasks and task attempts?

A) There are always exactly as many task attempts as there are tasks.
B) There are always at most as many task attempts as there are tasks.
C) There are always at least as many task attempts as there are tasks.

3. Your existing Hadoop cluster has 30 slave nodes, each of which has 4 x 2T hard drives. You plan to add another 10 nodes. How much disk space can your new nodes contain?

A) The new nodes must all contain 4 x 2TB hard drives
B) The new nodes can contain any amount of disk space
C) The new nodes cannot contain more than 8TB of disk space
D) The new nodes must all contain 8TB of disk space, but it does not matter how the disks are configured

4. What action occurs automatically on a cluster when a DataNode is marked as dead?

A) The NameNode informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.
B) The replication factor of the files which had blocks stored on the dead DataNode is temporarily reduced, until the dead DataNode is recovered and returned to the cluster.
C) The next time a client submits job that requires blocks from the dead DataNode, the JobTracker receives no heart beats from the DataNode. The JobTracker tells the NameNode that the DataNode is dead, which triggers block re-replication on the cluster.
D) The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.

5. Your Hadoop cluster has 12 slave nodes, a block size set to 64MB, and a replication factor of three.
Choose which best describes how the Hadoop Framework distributes block writes into HDFS from a Reducer outputting a 150MB file?

A) Reducers don't write blocks into HDFS
B) The Reducer will generate nine blocks and write them randomly to nodes throughout the cluster.
C) The slave node on which the Reducer runs gets the first copy of every block written. Other block replicas will be placed on other nodes.
D) The Reducer will generate twelve blocks and write them to slave nodes nearest the node on which the Reducer runs.

Solutions: