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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. What happens if a Mapper on one node goes into an infinite loop while running a MapReduce job?

A) After a period of time, the JobTracker will restart the TaskTracker on the node on which the map task is running
B) After a period of time, the TaskTracker will kill the Map Task.
C) The Mapper will run indefinitely; the TaskTracker must be restarted to kill it
D) The job will immediately fail.

2. Which three processes does HDFS High Availability (HA) enable on your cluster?

A) Write data to two clusters simultaneously
B) Automatically 'fail over' between NameNodes if one goes down
C) Shut one NameNode down for maintenance without halting the cluster
D) Manually 'fail over' between NameNodes
E) Configure unlimited hot standby NameNode.

3. You set mapred.tasktracker.reduce.tasks.maximum to a value of 4 on a cluster running mapreduce v1 (MRv1). How many reducers will run for any given job?

A) a maximum of 4 reducer's, but the actual number of reducer's that run for any given job is based on the volume intermediate data.
B) Four reducer's will run. Once set by the cluster administrator, this parameter can't be overridden
C) Maximum of 4 reducers, but the actual number of reducers that run for any given job is based on the volume of input data
D) The number of reducer's for any given job is set by the developer

4. How does HDFS Federation help HDFS Scale horizontally?

A) HDFS Federation allows the Standby NameNode to automatically resume the services of an active NameNode.
B) HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster administrator to split the Block Storage outside the local cluster.
C) HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the NameNode as a single-point-of-failure.
D) HDFS Federation reduces the load on any single NameNode by using the multiple, independent NameNode to manage individual pars of the filesystem namespace.

5. Cluster Summary
45 files and directories, 12 blocks = 57 total. Heap Size is 15.31 MB / 193.38MB(7%)

Refer to the above screenshot.
You configure the Hadoop cluster with seven DataNodes and the NameNode's web UI displays the details shown in the exhibit.
What does this tells you?

A) Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.
B) The HDFS cluster is in the safe mode.
C) The DataNode JVM on one host is not active.
D) One physical host crashed.

Solutions: