Cloudera CCAH CCA-470

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Cloudera CCA-470 Exam Syllabus Topics:

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

1. Your cluster implements HDFS High Availability (HA). You two NameNodes are named nn01 and nn02. What occurs when you execute the command:
Hdfs haadmin -failover nn01 nn02

A) nn02 becomes the standby NameNode and nn02 becomes the active NameNode
B) Nn01 becomes the standby NameNode and nn02 becomes the active NameNode
C) Nn01 is fenced, and nn02 becomes the active NameNode
D) Nn01 is fenced, and nn01 becomes the active NameNode

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

3. Compare the hardware requirements of the NameNode with that of the DataNodes in a Hadoop cluster:

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

4. You are running a Hadoop cluster with NameNode on host mynamenode, a secondary NameNode on host mysecondary and DataNodes.
Which best describes how you determine when the last checkpoint happened?

A) Connect to the web UI of the Secondary NameNode (http://mysecondarynamenode:50090) and look at the "Last Checkpoint" information
B) Execute hdfs dfsadmin -report on the command line in and look at the Last Checkpoint information.
C) Connect to the web UI of the NameNode (http://mynamenode:50070/) and look at the "Last Checkpoint" information
D) Execute hdfs dfsadmin -saveNameSpace on the command line which returns to you the last checkpoint value in fstime file.

5. Your Hadoop cluster has 25 nodes with a total of 100 TB (4 TB per node) of raw disk space allocated HDFS storage. Assuming Hadoop's default configuration, how much data will you be able to store?

A) Approximately 25TB
B) Approximately 100TB
C) Approximately 10TB
D) Approximately 33 TB

Solutions: