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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

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

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

2. Identify the daemon that performs checkpoint operations of the namespace state in a cluster configured with HDFS High Availability (HA) using Quorum based-storage?

A) Secondary NameNode
B) CheckpointNode
C) BackupNode
D) NodeManeger
E) JournalNode
F) NameNode
G) Standby NameNode

3. Your cluster is running Map v1 (MRv1), with default replication set to 3, and a cluster blocks 64MB. Identify which best describes the file read process when a Client application connects into the cluster and requests a 50MB file?

A) The client queries the NameNode for the locations of the block, and reads from the first location in the list of receives.
B) The client queries the NameNode and then retrieves the block from the nearest DataNode to the client and then passes that block back to the client.
C) The client queries the NameNode for the locations of the block, and reads all three copies. The first copy to complete transfer to the client is the one the client reads as part of Hadoop's execution framework.
D) The client queries the NameNode for the locations of the block, and reads from a random location in the list it receives to eliminate network I/O loads by balancing which nodes it retrieves data from at any given time.

4. What is the rule governing the formatting of the underlying filesystem in the hadoop cluster?

A) They must all use the same file system but this does not need to be the same filesystem as the filesystem used by the namenode
B) They can use different file system
C) they must all be left as formatted raw disk, hadoop format them automatically
D) They must all use the same filesystem as the namenode
E) They must all be left as unformatted, rawdisk;hadoop uses raw unformatted disk for HDFS

5. Your Hadoop cluster contains nodes in three racks. Choose which scenario results if you leave the dfs.hosts property in the NameNode's configuration file empty (blank)?

A) No new can be added to the cluster until you specify them in the dfs.hosts file.
B) Any machine running the DataNode daemon can immediately join the cluster.
C) Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in mapred.hosts to join the cluster.
D) The NameNode will update dfs.hosts property to include machines running the DataNode daemon on the next NameNode reboot or with a dfsadmin -refreshNodes.

Solutions: