The YARN application workflow

Now, take a look at the following sequence diagram that describes the YARN application workflow and also explains how container allocation is done for an application via the ApplicationMaster:

Refer to the preceding diagram for the following details:

• The client submits the application request to the ResourceManager.

• The ResourceManager registers the application with the ApplicationManager, generates the ApplicationID, and responds to the client with the successfully registered ApplicationID.

• Then, the ResourceManager starts the client's ApplicationMaster in a separate available container. If no container is available, then this request has to wait till a suitable container is found, and send the application registration request for application registration.

• The ResourceManager shares all the minimum and maximum resource capabilities of the cluster with the ApplicationMaster. Then, the ApplicationMaster decides how to efficiently use the available resources to fulfill...