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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. You have a cluster running with the fair scheduler enabled and configured. You submit multiple jobs to the cluster. Each job is assigned to a pool. What are the two key points to remember about how jobs are scheduled with the fair scheduler?

A) Each pool gets 1/M of the total available tasks slots, where M is the no. of nodes in the cluster
B) Each pool gets 1/N of the total available tasks slots, where N is the no of jobs running on the cluster
C) Pools get a dynamically-allocated share of the available task slots (subject to additional constraints)
D) Pools are assigned priorites.pools with higher priorities an executed b4 pools with lower priorities
E) Each pools share of task slots may change throughout the course of job execution
F) Each pools share of the tasks slots remains static within the execution of any individual job

2. Your existing Hadoop cluster has 30 slave nodes, each of which has 4 x 2T hard drives. You plan to add another 10 nodes. How much disk space can your new nodes contain?

A) The new nodes cannot contain more than 8TB of disk space
B) The new nodes can contain any amount of disk space
C) The new nodes must all contain 4 x 2TB hard drives
D) The new nodes must all contain 8TB of disk space, but it does not matter how the disks are configured

3. Your cluster has nodes in seven racks, and you have provided a rack topology script. What is Hadoop's block placement policy, assuming a block replication factor of three?

A) All three of the block are written to nodes on the same rack
B) One copy of the block is written to a node in one rack; two copies are written to two nodes in a different rack
C) One copy of the block is written to a node in each of three racks
D) Because there are seven racks the block is written to a node on each rack

4. What two processes must you do if you are running a Hadoop cluster with a single NameNode and six DataNodes, and you want to change a configuration parameter so that it affects all six DataNodes.

A) You must restart all six DataNode daemons to apply the changes to the cluster.
B) You must modify the configuration files on only one of the DataNode machine
C) You must restart the NameNode daemon to apply the changes to the cluster
D) You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes.
E) You must modify the configuration files on each of the six DataNode machines.
F) You don't need to restart any daemon, as they will pick up changes automatically.

5. Choose three reasons why should you run the HDFS balancer periodically?

A) To ensure that there is consistent disk utilization across the DataNodes.
B) To ensure that all blocks in the cluster are 128MB in size.
C) To help HDFS deliver consistent performance under heavy loads.
D) To improve data locality for MapReduce tasks.
E) To ensure that there is capacity in HDFS tor additional data.

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