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

1. Which of the following statements is the most accurate about the choice of operating systems to run on a Hadoop cluster?

A) Linux is preferable to Windows and Solaris/OpenSolaris, but the choice of Linux distribution is unimportant when planning a Hadoop cluster.
B) Linux and Solaris/OpenSolaris are preferable to Windows. Solaris running on SPARC hardware is the preferred Hadoop slave node configuration.
C) Linux is preferable to Windows and Solaris/OpenSolaris. Some Linux distributions are intended for cluster environments more than others.
D) The choice of operating system isn't very important for a Hadoop cluster.

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 fs -du/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 dfsadmin -report and locate the DFS Remaining value.

3. What's the relationship between JobTrackers and TaskTrackers?

A) The TaskTrackers runs on a single master node and accepts MapReduce jobs from clients. A JobTracker runs on every slave node and is responsible for managing map and reduce tasks.
B) The JobTracker runs on a single master node, but forks a separate instance of itself for every client MapReduce job. A TaskTracker runs on every slave node and is responsible for managing actual map and reduce tasks.
C) The JobTracker runs on a single master node and accepts MapReduce jobs from clients. A TaskTracker runs on every slave node and is responsible for managing actual map and reduce tasks.
D) Every node in the cluster runs both a JobTracker and a TaskTracker. The JobTrackers manage jobs, and the TaskTrackers are responsible for managing actual map and reduce tasks.

4. Identity four pieces of cluster information that are stored on disk on the NameNode?

A) An edit log of changes that have been made since the last snapshot of the NameNode.
B) The status of the heartbeats of each DataNode.
C) An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.
D) A catalog of DataNodes and the blocks that are stored on them.
E) Names of the files in HDFS.
F) File permissions of the files in HDFS.
G) The directory structure of the files in HDFS.

5. In the context of configuring a Hadoop cluster for HDFS High Availability (HA), 'fencing' refers to:

A) Isolating the cluster's master daemon to limit write access only to authorized clients.
B) Isolating the standby NameNode from write access to the fsimage and edits files.
C) Isolating a failed NameNode from write access to the fsimage and edits files so that is cannot resume write operations if it recovers.
D) Isolating both HA NameNodes to prevent a client application from killing the NameNode daemons.

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