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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. You've configured your cluster with HDFS Federation. One NameNode manages the /data namesapace and another Name/Node manages the /reports namespace. How do you configure a client machine to access both the /data and the /reports directories on the cluster?

A) You don't need to configure any parameters on the client machine. Access is controlled by the NameNodes managing the namespace.
B) Configure the client to mount both namespaces by specifying the appropriate properties in the core-site.xml
C) You cannot configure a client to access both directories in the current implementation of HDFS Federation.
D) Configure the client to mount the /data namespace. As long as a single namespace is mounted and the client participates in the cluster, HDFS grants access to all files in the cluster to that client.

2. What happens if a Mapper on one node goes into an infinite loop while running a MapReduce job?

A) The Mapper will run indefinitely; the TaskTracker must be restarted to kill it
B) The job will immediately fail.
C) After a period of time, the TaskTracker will kill the Map Task.
D) After a period of time, the JobTracker will restart the TaskTracker on the node on which the map task is running

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

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

4. Each slave node in your cluster has four 2 TB hard drives installed (4x2TB). You set a value of the dfs.du.datanode.received parameter to 100GB on each slave node. How does this alter HDFS block storage?

A) All Hard drives may be used to store HDFS blocks as long as at least 100GB in total is available on the node
B) 100 GB on each hard drive may not be used to store HDFS blocks
C) a maximum of 100GB on each hard drive may be used to store HDFS blocks
D) 25 GB on each hard drive may not be used to store HDFS Blocks

5. The failure of which daemon makes HDFS unavailable on a cluster running MapReduce v1 (MRv1)?

A) Application Manager
B) Node Manager
C) DataNode
D) Secondary NameNode
E) Resource Manager
F) NameNode

Solutions: