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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. The most important consideration for slave nodes in a Hadoop cluster running production jobs that require short turnaround times is:

A) The ratio between the number of processor cores and total storage capacity.
B) The ratio between the number of processor cores and the amount of memory.
C) The ratio between the amount of memory and the number of disk drives.
D) The ratio between the number of processor cores and number of disk drives.
E) The ratio between the amount of memory and the total storage capacity.

2. In the execution of a MapReduce job, where does the mapper place the intermediate data in each map task?

A) The mapper transfer the intermediate data immediately to the reducers as it is generated by map task.
B) The hadoop framework holds the intermediate data in the task trackers memory until it is transferred to the reducers
C) The mapper transfers the intermediate data to the jobtracker, which then sends it to the reducers
D) The mapper stores the intermediate data on the underlying filesystem of the local disk of the machine which ran the map task

3. For each job, the Hadoop framework generates task log files. Where are Hadoop's task log files stored?

A) Cached on the local disk of the slave node running the task, then purged immediately upon task completion.
B) In HDFS, in the directory of the user who generates the job.
C) Cached on the local disk of the slave node running the task, then copied into HDFS.
D) On the local disk of the slave node running the task.

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

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

5. When requesting a file, how does HDFS retrieves the blocks associated with that file?

A) the client polls the datanodes for the block ID's
B) the namenode reads the block ID's from disk
C) The namenode reads the block ID's from memory
D) the namenode requires the datanode for the block ID's

Solutions: