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

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

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

3. Your company stores user profile records in an OLTP database. You want to join these records with webserver logs. You have already ingested into the hadoop file system. What is the best way to obtain and ingest these user records?

A) Ingest using the HDFS put command
B) Ingest with hadoop streaming
C) Ingest with SQL import
D) Ingest with Pig's Load Command
E) Ingest with flume agents
F) Ingest using hives LOAD DATA command

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

5. What action occurs automatically on a cluster when a DataNode is marked as dead?

A) The replication factor of the files which had blocks stored on the dead DataNode is temporarily reduced, until the dead DataNode is recovered and returned to the cluster.
B) The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.
C) The next time a client submits job that requires blocks from the dead DataNode, the JobTracker receives no heart beats from the DataNode. The JobTracker tells the NameNode that the DataNode is dead, which triggers block re-replication on the cluster.
D) The NameNode informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.

Solutions: