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Cloudera CCA-470 Exam Syllabus Topics:

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

Question 1

Your developers request that you enable them to use Hive on your Hadoop cluster. What do install and/or configure?

A. Install the Hive Interpreter on the client machines and all the slave nodes, and configure a shared remote Hive Metastore.
B. Install the Hive interpreter on the master node running the JobTracker, and configure a shared remote Hive Metastore.
C. Install the Hive interpreter on the client machines only, and configure a shared remote Hive Metastore.
D. Install the Hive interpreter on the client machines and all nodes on the cluster

Question 2

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

Question 3

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.

Question 4

You observe that the number of spilled records from map tasks for exceeds the number of map output records. You child heap size is 1 GB and your io.sort.mb value is set to 100MB. How would you tune your io.sort.mb value to achieve maximum memory to disk I/O ratio?

A. Tune io.sort.mb value until you observe that the number of spilled records equals (or is as close to equals) the number of map output records.
B. For 1GB child heap size an io.sort.mb of 128MB will always maximum memory to disk I/O.
C. Increase the IO.sort.mb as high you can, as close to 1GB as possible.
D. Decrease the io.sort.mb value below 100M

Question 5

What metadata is stored on a DataNode when a block is written to it?

A. None. Only the block itself is written.
B. Checksums for the data in the block, as a separate file.
C. Information on the file's location in HDFS.
D. Node location of each block belonging to the same namespace.

Solutions: