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Study Material

Application Master

An application is a single job that is sent to the framework. Each such application is associated with a unique Application Master which is a framework-specific entity.
It is the process that controls the application's execution of a cluster request and handles errors as well.
Its role is to negotiate Resource Manager resources and work with the Node Manager to perform and monitor the tasks of the component
It is also the Resource Manager's duty to negotiate suitable resource containers, track their status, and monitor progress.
It regularly sends heartbeats to the Resource Manager once it has started to affirm its health and update its resource requirements record.

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