YARN NodeManager

The YARN NodeManager is a component in a distributed computing system that manages and monitors resources on individual machines, or nodes, within a cluster. It ensures that applications running on the node have the necessary CPU, memory, and other resources, and reports their status back to the central ResourceManager. Essentially, it acts as a local manager that oversees tasks, manages job execution, and maintains health checks, allowing the entire system to efficiently distribute and coordinate workload across many computers.