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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?

A) They must not be formatted - - HDFS will format the filesystem automatically
B) They must be formatted as either ext3 or ext4
C) They must be formatted as HDFS
D) They may be formatted in nay Linux filesystem

2. Each slave node in your cluster has four 2 TB hard drives installed (4x2TB). You set a value of the dfs.du.datanode.received parameter to 100GB on each slave node. How does this alter HDFS block storage?

A) 25 GB on each hard drive may not be used to store HDFS Blocks
B) All Hard drives may be used to store HDFS blocks as long as at least 100GB in total is available on the node
C) a maximum of 100GB on each hard drive may be used to store HDFS blocks
D) 100 GB on each hard drive may not be used to store HDFS blocks

3. What happens when a map task crashes while running a mapreduce job?

A) The jobtracker attempts to re-run the task on the same node
B) the jobtracket attempts to re-run the task on a different node
C) The job immediately fails
D) The tasktracker closes the JVM instance and restarts

4. Using cloudera manager on CDH4 cluster running mapreduce V1(MRv1), you delete a tasktracker role instance from a host that also a runs a datanode role instance and a region server role instance.cloudera
Manager make changes to the cluster and prompts you to the accept the changes.
What other configuration option will cloudera manager automatically prompt you to change?

A) The option to change java maximum heap sizes for the other role instances
B) the option to specify an alternate slave host to place the received data node role instance
C) the option to immediately rebalance the cluster
D) The option to failover to the instance by namenode

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

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

Solutions: