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Cloudera CCA-470 Exam Syllabus Topics:

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

1. 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 10TB
B) Approximately 33 TB
C) Approximately 25TB
D) Approximately 100TB

2. Your Hadoop cluster has 12 slave nodes, a block size set to 64MB, and a replication factor of three.
Choose which best describes how the Hadoop Framework distributes block writes into HDFS from a Reducer outputting a 150MB file?

A) The slave node on which the Reducer runs gets the first copy of every block written. Other block replicas will be placed on other nodes.
B) The Reducer will generate twelve blocks and write them to slave nodes nearest the node on which the Reducer runs.
C) Reducers don't write blocks into HDFS
D) The Reducer will generate nine blocks and write them randomly to nodes throughout the cluster.

3. Assuming a large properly configured multi-rack Hadoop cluster, which scenario should not result in loss of HDFS data assuming the default replication factor settings?

A) Seventy percent of DataNodes simultaneously fail.
B) Multiple racks simultaneously fail.
C) All DataNodes simultaneously fail.
D) An entire rack fails.
E) Ten percent of DataNodes simultaneously fail.

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

A) 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.
B) The NameNode forces re-replication of all the blocks which were stored on the dead 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 NameNode informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.

5. What is the Secondary NameNode?

A) A process purely intended to perform backups of the NameNode.
B) A standby NameNode, for high availability.
C) An alternate data channel for clients to reach HDFS, should the NameNode become too busy.
D) A process that performs a checkpoint operation on the files produced by the NameNode.
E) A data channel between the primary name node and the tertiary NameNode.

Solutions: