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Study Material

Node Manager

In a Hadoop cluster, it takes care of individual nodes and handles user jobs and workflows on the specified node.
It registers with the Resource Manager and then sends heartbeats with the health status of the node.
The primary objective is to handle application containers assigned to it by the resource manager.
This keeps the Resource Manager up-to-date.
Application Master requests the Node Manager's allocated container by sending it a Container Launch Context (CLC) which includes all the application that needs to be run. The Node Manager creates and starts the process of the requested container.
Monitor the use of the resources (memory, CPU) of each container.
Performs Log management.
It also destroys the resource manager's container as directed.

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