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Cloudera CCA-410 Exam Syllabus Topics:

Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Your existing Hadoop cluster has 30 slave nodes, each of which has 4 x 2T hard drives. You plan to add another 10 nodes. How much disk space can your new nodes contain?

A) The new nodes must all contain 4 x 2TB hard drives
B) The new nodes must all contain 8TB of disk space, but it does not matter how the disks are configured
C) The new nodes can contain any amount of disk space
D) The new nodes cannot contain more than 8TB of disk space

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

3. Which two features does Kerberos security add to a Hadoop cluster?

A) Root access to the cluster for users hdfs and mapred but non-root acess clients
B) Authentication for user access to the cluster against a central server
C) Encryption on all remote procedure calls (RPCs)
D) Encryption for data on disk ("at rest")
E) User authentication on all remote procedure calls (RPcs)

4. Which two occur when individual blocks are returned to DATANODE on a cluster local filesystem?

A) The datanode runs a block scanner datablock scanner to verify the return blocks.
B) A metadata file is return to the datanode containing all the other node locations in the namespace
C) The datanode writes a metadata file with the name of the file the block is associated with
D) The datanode updates it's log of checkum verification
E) A metadata file is written to the datanode containing the checksums for each block

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

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

Solutions: