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

1. Which of the following statements arc accurate in describing features of Hadoop rack awareness? (Choose 2)

A) HDFS is rack aware but MapReduce daemons are not.
B) Configuration of rack awareness is accomplished using a configuration file. You cannot use a rack topology script.
C) Even for small clusters on a single rack, configuring rack awareness will improve performance.
D) Hadoop gives preference to intra-rack data transfer In order to conserve bandwidth.
E) Rack location is considered in the HDFS block placement policy.

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

3. Compare the hardware requirements of the NameNode with that of the DataNodes in a Hadoop cluster running MapReduce v1 (MRv1):

A) The NameNode requires more memory and requires greater disk capacity than the DataNodes.
B) The NameNode requires less memory and less disk capacity than the DataNodes.
C) The NameNode and DataNodes should the same hardware configuration.
D) The NameNode requires more memory and no disk drives.
E) The NameNode requires more memory but less disk capacity.

4. Which three distcp features can you utilize on a Hadoop cluster?

A) Use distcp to copy files only between two clusters or more. You cannot use distcp to copy data between directories inside the same cluster.
B) Use distcp to copy data between directories inside the same cluster.
C) Use distcp to run an internal MapReduce job to copy files.
D) Use distcp to copy physical blocks from the source to the target destination in your cluster.
E) Use distcp to copy HBase table files.

5. Under which scenario would it be most appropriate to consider using faster (e.g 10 Gigabit) Ethernet as the network fabric for your Hadoop cluster?

A) When the typical workloads consists of processor-intensive tasks.
B) When the typical workloads consumes a large amount of input data, relative to the entire capacity of HDFS.
C) When the typical workloads generates a large amount of output data, significantly larger than the amount of intermediate data.
D) When the typical workloads generates a large amount of intermediate data, on the order of the input data itself.

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