How Do You Troubleshoot the Hadoop Error “ApplicationClientProtocolPBClientImpl.getApplicationReport”?

Problem scenario
You are running a Hadoop command, but you get this message:

java.net.ConnectException: Your endpoint configuration is wrong; For more details see: http://wiki.apache.org/hadoop/UnsetHostnameOrPort, while invoking ApplicationClientProtocolPBClientImpl.getApplicationReport over null after 3 failover attempts. Trying to failover after sleeping for 22088ms.
2020-12-20 18:54:36,679 INFO ipc.Client:

What should you do?

Possible Solution
Is Resource Manager running? Start a new terminal and run "jps" to find out. Often Resource Manager is started with a Yarn script like this: bash /usr/local/hadoop/sbin/start-yarn.sh

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