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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

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

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

2. Your running a hadoop cluster with a name node on the host mynamenode.
What are two ways you can determine available HDFS space in your cluster?

A) Connect to http://mynamenode:50070/and locate the dfs remaining value
B) Run hadoop fs -du / and locate the dfs remaining value
C) Run hadoop dfsadmin - report and locate the DFS remaming value
D) Run hadoop DFSAdmin -spaceQuota and subtract DFS used % from configured capacity

3. You configure your hadoop development cluster with both mapreduce frameworks, mapreduceV1 (MRv1) and mapreduce v2 (MRv2/YARN). You plan to run only one set of mapreduce daemons at a time in this development environment (running both simultaneously results in an unsuitable cluster but configure in both moving between them is fine). Which two mapreduce (capitation) daemons do you need to configure to run on your masternodes?

A) Nodemanager
B) Applicationmaster
C) Journalnode
D) Jobtracker
E) Resourcemanager
F) Containermanager

4. 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) The NameNode will update dfs.hosts property to include machines running the DataNode daemon on the next NameNode reboot or with a dfsadmin -refreshNodes.
C) Any machine running the DataNode daemon can immediately join the cluster.
D) Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in mapred.hosts to join the cluster.

5. Your Hadoop cluster has 25 nodes with a total of 100 TB (4 TB per node) of raw disk space allocated HDFS storage. Assuming Hadoop's default configuration, how much data will you be able to store?

A) Approximately 100TB
B) Approximately 33 TB
C) Approximately 25TB
D) Approximately 10TB

Solutions: