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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

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

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

3. Your Hadoop cluster has 25 nodes with a total of 100 TB (4 TB per node) of raw disk space allocated HDFS storage. Assuming Hadoop's default configuration, how much data will you be able to store?

A) Approximately 33 TB
B) Approximately 100TB
C) Approximately 25TB
D) Approximately 10TB

4. When planning a hadoop cluster, what general rule governs the hardware requirements between master nodes and slave nodes?

A) The master and slave nodes should have the same hardware configuration
B) The master nodes requires more memory and no disk drives
C) The master nodes requires more memory but less disk capacity
D) the master nodes requires less memory and fewer number disk drives than the slave nodes
E) The master nodes require more memory and greater disk capacity then the slave nodes

5. Under which scenario would it be most appropriate to consider using faster (e.g 10 Gigabit) Ethernet as the network fabric for your Hadoop cluster?

A) When the typical workloads generates a large amount of output data, significantly larger than the amount of intermediate data.
B) When the typical workloads consists of processor-intensive tasks.
C) When the typical workloads consumes a large amount of input data, relative to the entire capacity of HDFS.
D) When the typical workloads generates a large amount of intermediate data, on the order of the input data itself.

Solutions: