Description: NodeManager is a per-node daemon in YARN (Yet Another Resource Negotiator) that manages the execution of containers on a single node. Its primary function is to monitor and manage computing resources, such as CPU and memory, ensuring that distributed applications run efficiently. NodeManager is responsible for resource allocation to applications running on the node, as well as monitoring the status of containers, which are the execution units where tasks are carried out. Additionally, it communicates with the ResourceManager, the central component of YARN, to report resource status and receive instructions on container allocation. Furthermore, NodeManager also manages the lifecycle of containers, including their creation, start, termination, and cleanup. This architecture allows for significant scalability and flexibility in processing large volumes of data, facilitating the execution of multiple applications in a distributed environment. In summary, NodeManager is essential for the efficient operation of YARN, enabling organizations to maximize their computing resources in distributed computing environments.
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