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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. When planning a hadoop cluster, what general rule governs the hardware requirements between master nodes and slave nodes?

A) The master nodes requires more memory and no disk drives
B) The master nodes requires more memory but less disk capacity
C) The master nodes require more memory and greater disk capacity then the slave nodes
D) The master and slave nodes should have the same hardware configuration
E) the master nodes requires less memory and fewer number disk drives than the slave nodes

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

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

3. What are the permissions of a file in HDFS with the following:rw-rw-r-x?

A) the owner and group can read the file other can't
B) the owner and group can modify the contents of the file other can't
C) HDFS runs in user space which makes all users with access to the namespace able to read, write and modify all files
D) No one can modify the content of the file
E) the owner and group cannot delete the file, but other can

4. What four functions do scheduling algorithms perform on hadoop cluster?

A) Run jobs at periodic times of the day
B) support the implementation of service-level agreements for multiple cluster users
C) allow short jobs to complete even when large, long jobs (consuming a lot of resources are running)
D) Reduce the total amount of computation necessary to complete a job.
E) Allow multiple users to share clusters in a predictable policy-guided manner
F) Ensure data locality by ordering map tasks so that they run on data local maps slots
G) Reduce the job latencies in environment with multiple jobs of different sizes

5. How does the NameNode know DataNodes are available on a cluster running MapReduce v1 (MRv1)

A) DataNodes listed in the dfs.hosts file. The NameNode uses as the definitive list of available DataNodes.
B) The NameNode broadcasts a heartbeat on the network on a regular basis, and DataNodes respond.
C) DataNodes heartbeat in the master on a regular basis.
D) The NameNode send a broadcast across the network when it first starts, and DataNodes
respond.

Solutions: