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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Your cluster implements hdfs high availability (HA) your two namenodes are named hadoop01 and hadoop02. What occurs when you execute the command:
Sudo -u hdfs haadmin -failover hadoop01 hadoop02

A) Hadoop02 is fenced, and hadoop01 becomes active namenode
B) Hadoop01 becomes inactive and hadoop02 becomes the active namenode
C) Hadoop01 is fenced, and hadoop02 becomes the active namenode
D) Hadoop02 becomes the standby namenode and hadoop01 becomes the active namenode

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. You observe that the number of spilled records from map tasks for exceeds the number of map output records. You child heap size is 1 GB and your io.sort.mb value is set to 100MB. How would you tune your io.sort.mb value to achieve maximum memory to disk I/O ratio?

A) Decrease the io.sort.mb value below 100M
B) For 1GB child heap size an io.sort.mb of 128MB will always maximum memory to disk I/O.
C) Tune io.sort.mb value until you observe that the number of spilled records equals (or is as close to equals) the number of map output records.
D) Increase the IO.sort.mb as high you can, as close to 1GB as possible.

4. What additional capability does Ganglia provide to monitor a Hadoop?

A) Ability to monitor the amount of free space on HDFS.
B) Ability to monitor processor utilization.
C) Ability to monitor number of files in HDFS.
D) Ability to monitor NameNode memory usage.
E) Ability to monitor free task slots.

5. Identify the function performed by the Secondary NameNode daemon on a cluster configured to run with a single NameNode.

A) In this configuration, the Secondary NameNode performs a checkpoint operation on the files by the NameNode.
B) In this configuration, the Secondary NameNode performs deal-time backups of the NameNode.
C) In this configuration, the Secondary NameNode is standby NameNode, ready to failover and provide high availability.
D) In this configuration, the Secondary NameNode servers as alternate data channel for clients to reach HDFS, should the NameNode become too busy.

Solutions: