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

1. What do you need to do when adding new slave nodes to a cluster?

A) Increase the value of dfs.number.of.nodes in hdfs-site.xml.
B) Add a new entry to /etc/slavenodes on the NameNode host.
C) Restart the NameNode daemon.
D) Halt and resubmit any running MapReduce jobs to guarantee correctness.
E) add the new node's DNS name to the conf/slaves file on the master node.

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

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

3. Which of the following scenarios makes HDFS unavailable?

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

4. A client wants to read a file from HDFS. How does the data get from the DataNodes to the client?

A) The NameNode reads the blocks from the DataNodes, and caches them. Then, the application reads the blocks from the NameNode.
B) The blocks are sent to a single DataNode, then the application reads the blocks from that Data Node.
C) The application reads the blocks directly from the DataNodes.

5. You are a Hadoop cluster with a NameNode on host mynamenode. What are two ways to determine available HDFS space in your cluster?

A) Run hadoop fs -du/and locate the DFS Remaining value.
B) Run hadoop dfsadmin -SpaceQuota and subtract HDFS Used from Configured Capacity.
C) Run hadoop dfsadmin -report and locate the DFS Remaining value.
D) Connect to http://mynamemode:50070/ and locate the DFS Remaining value.

Solutions: