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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. MapReduce V2 (MRv2/YARN) splits which two major functions of the jobtracker into separate daemons?

A) Job scheduling/monitoring
B) MapReduce metric reporting
C) Health status check (heartbeats)
D) Managing tasks
E) Launching tasks
F) Job coordination between the resource manager and the node manager
G) Managing file system metadata
H) Resource management

2. Identify the function performed by the Secondary NameNode daemon on a cluster configured to run with a single NameNode.

A) In this configuration, the Secondary NameNode performs deal-time backups of the NameNode.
B) In this configuration, the Secondary NameNode servers as alternate data channel for clients to reach HDFS, should the NameNode become too busy.
C) In this configuration, the Secondary NameNode is standby NameNode, ready to failover and provide high availability.
D) In this configuration, the Secondary NameNode performs a checkpoint operation on the files by the NameNode.

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

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

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

5. You configure you cluster with HDFS High Availability (HA) using Quorum-Based storage. You do
not implement HDFS Federation.
What is the maximum number of NameNodes daemon you should run on you cluster in order to avoid a "split-brain" scenario with your NameNodes?

A) Unlimited. HDFS High Availability (HA) is designed to overcome limitations on the number of NameNodes you can deploy.
B) Two active NameNodes and two Standby NameNodes
C) One active NameNode and one Standby NameNode
D) Two active NameNodes and one Standby NameNode

Solutions: