You use the hadoop fs –put command to add a file “sales.txt” to HDFS. This file is small enough
that it fits into a single block, which is replicated to three nodes in your cluster (with a replication
factor of 3). One of the nodes holding this file (a single block) fails. How will the cluster handle the
replication of file in this situation?

Given:

You want to clean up this list by removing jobs where the State is KILLED. What command you enter?

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 the third command?

You are configuring a server running HDFS, MapReduce version 2 (MRv2) on YARN running
Linux. How must you format underlying file system of each DataNode?

You are migrating a cluster from MApReduce version 1 (MRv1) to MapReduce version 2 (MRv2)
on YARN. You want to maintain your MRv1 TaskTracker slot capacities when you migrate. What
should you do/

On a cluster running MapReduce v2 (MRv2) on YARN, a MapReduce job is given a directory of 10
plain text files as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers
will run?

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