You are 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 this file in this situation/

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
aMapReduce 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?

Which two are Features of Hadoop’s rack topology?

Which YARN daemon or service negotiates map and reduce Containers from the
Scheduler, tracking their status and monitoring for progress?

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

Your cluster has the following characteristics: • A rack aware topology is configured and on •
Replication is not set to 3 • Cluster block size is set to 64 MB Which describes the file read
process when a client application connects into the cluster and requests a 50MB file?