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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. 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) Any machine running the DataNode daemon can immediately join the cluster.
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) No new can be added to the cluster until you specify them in the dfs.hosts file.
D) Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in mapred.hosts to join the cluster.

2. How do you access the long messages a mapreduce application generates after you run it on your cluster?

A) You connect to the job tracker web UI and locate the details for your job this will include long messages
B) You browse the currect working directory of the client machine from which You submitted the job
C) You remotely log in to any slave node in the cluster to browse your jobs log files in/var/log/hadoop/archive directly
D) You browse the /logs directly in HDFS where all jobs log files as store

3. Which daemons instantiates JVM's to perform mapreduce processing in a cluster running mapreduce v1 (MRv1)?

A) Jobtracker
B) Nodemanager
C) applicationmanager
D) Resourcemanager
E) Applicationmaster
F) Tasktracker
G) Namenode
H) Datanode

4. Which two daemons must be installed on master nodes in hadoop cluster running mapreduce V1 (MRV1)?

A) ApplicationMaster
B) Zookeeper
C) Resourcemanager
D) Tasktracker
E) Hmaster
F) Namenode
G) Datanode

5. Which MapReduce daemon instantiates user code, and executes map and reduce tasks on a cluster running MapReduce v1 (MRv1)?

A) DataNode
B) ApplicationMaster
C) ResourceManager
D) NameNode
E) TaskTracker
F) NodeManager
G) JobTracker

Solutions: