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Cloudera CCA-470 Exam Syllabus Topics:

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) 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) 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) 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.

2. You set up the Hadoop cluster using NameNode Federation. One NameNode manages the/users namespace and one NameNode manages the/data namespace. What happens when client tries to write a file to/reports/myreport.txt?

A) The file successfully writes to /users/reports/myreports/myreport.txt.
B) The file successfully writes to /report/myreport.txt. The metadata for the file is managed by the first NameNode to which the client connects.
C) The client throws an exception.
D) The file writes fails silently; no file is written, no error is reported.

3. How does the NameNode know DataNodes are available on a cluster running MapReduce v1 (MRv1)

A) The NameNode broadcasts a heartbeat on the network on a regular basis, and DataNodes respond.
B) The NameNode send a broadcast across the network when it first starts, and DataNodes respond.
C) DataNodes heartbeat in the master on a regular basis.
D) DataNodes listed in the dfs.hosts file. The NameNode uses as the definitive list of available DataNodes.

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

A) The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
B) 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.
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 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.

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

Solutions: