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

1. Which of the following scenarios makes HDFS unavailable?

A) DataNode failure
B) TaskTracker failure
C) NameNode failure
D) Secondary NameNode failure
E) JobTracker failure

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

3. 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 HBase table files.
C) Use distcp to copy physical blocks from the source to the target destination in your cluster.
D) Use distcp to copy data between directories inside the same cluster.
E) Use distcp to run an internal MapReduce job to copy files.

4. You've configured your cluster with HDFS Federation. One NameNode manages the /data namesapace and another Name/Node manages the /reports namespace. How do you configure a client machine to access both the /data and the /reports directories on the cluster?

A) Configure the client to mount the /data namespace. As long as a single namespace is mounted and the client participates in the cluster, HDFS grants access to all files in the cluster to that client.
B) Configure the client to mount both namespaces by specifying the appropriate properties in the core-site.xml
C) You cannot configure a client to access both directories in the current implementation of HDFS Federation.
D) You don't need to configure any parameters on the client machine. Access is controlled by the NameNodes managing the namespace.

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 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 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) 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 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.

Solutions: