You are configuring your cluster to run HDFS and MapReduce v2 (MRv2) on YARN. Which
daemons need to be installed on your clusters master nodes?

Assume you have a file named foo.txt in your local directory. You issue the following three
commands:
Hadoop fs –mkdir input
Hadoop fs –put foo.txt input/foo.txt
Hadoop fs –put foo.txt input

What happens when you issue that third command?

You have a Hadoop cluster running HDFS, and a gateway machine external to the cluster from
which clients submit jobs. What do you need to do in order to run on the cluster and submit jobs
from the command line of the gateway machine?

You have converted your Hadoop cluster from a MapReduce 1 (MRv1) architecture to a
MapReduce 2 (MRv2) on YARN architecture. Your developers are accustomed to specifying map
and reduce tasks (resource allocation) tasks when they run jobs. A developer wants to know how
specify to reduce tasks when a specific job runs. Which method should you tell that developer to
implement?

You are upgrading a Hadoop cluster from HDFS and MapReduce version 1 (MRv1) to one running
HDFS and MapReduce version 2 (MRv2) on YARN. You want to set and enforce a block of
128MB for all new files written to the cluster after the upgrade. What should you do?