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

1. Assuming a large properly configured multi-rack Hadoop cluster, which scenario should not result in loss of HDFS data assuming the default replication factor settings?

A) Seventy percent of DataNodes simultaneously fail.
B) All DataNodes simultaneously fail.
C) Ten percent of DataNodes simultaneously fail.
D) An entire rack fails.
E) Multiple racks simultaneously fail.

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

3. Which MapReduce v2 (MR2/YARN) daemon is a per-machine slave responsible for launching application containers and monitoring application resources usage?

A) NodeManager
B) TaskTracker
C) ResourceManager
D) ApplicationMaster
E) JobTracker
F) ApplicationMasterService

4. How does HDFS Federation help HDFS Scale horizontally?

A) HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the NameNode as a single-point-of-failure.
B) HDFS Federation reduces the load on any single NameNode by using the multiple, independent NameNode to manage individual pars of the filesystem namespace.
C) HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster administrator to split the Block Storage outside the local cluster.
D) HDFS Federation allows the Standby NameNode to automatically resume the services of an active NameNode.

5. In HDFS, you view a file with rw-r--r-- set as its permissions. What does this tell you about the file?

A) The file cannot be run as a MapReduce job
B) The file cannot be deleted by anyone but the owner
C) The file's contents can be modified by the owner, but no-one else
D) As a Filesystem in Userspace (FUSE), HDFS files are available to all user's on a cluster regardless of their underlying POSIX permissions.
E) The file cannot be deleted by anyone

Solutions: