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?

Your cluster is running Map v1 (MRv1), with default replication set to 3, and a cluster blocks
64MB. Identify which best describes the file read process when a Client application connects into
the cluster and requests a 50MB file?

On a cluster running MapReduce v1 (MRv1), a MapReduce job is given a directory of 10 plain text
as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?

Identity four pieces of cluster information that are stored on disk on the NameNode?

How must you format the underlying filesystem of your Hadoop cluster’s slave nodes running on
Linux?

Your Hadoop cluster contains nodes in three racks. Choose which scenario results if you leave the
dfs.hosts property in the NameNode’s configuration file empty (blank)?

Which command does Hadoop offer to discover missing or corrupt HDFS data?

On a cluster running MapReduce v1 (MRv1), the value of the
mapred.tasktracker.map.tasks.maximum configuration parameter in the mapred-site.xml file
should be set to:

What metadata is stored on a DataNode when a block is written to it?

What does CDH packaging do on install to facilitate Kerberos security setup?