Understanding Hadoop YARN Architecture
Hadoop YARN (Yet Another Resource Negotiator) is the resource management and job scheduling component of the Apache Hadoop ecosystem. It is responsible for managing and allocating cluster resources to various applications and services running on the Hadoop cluster.
The key components of the YARN architecture are:
Resource Manager (RM)
The Resource Manager is the central authority that manages the cluster resources and schedules the applications. It is responsible for:
- Receiving application requests
- Allocating resources to applications
- Monitoring the health of the cluster
Node Manager (NM)
The Node Manager is an agent that runs on each worker node in the Hadoop cluster. It is responsible for:
- Launching and monitoring containers
- Reporting the node's resource usage and health to the Resource Manager
Application Master (AM)
The Application Master is a per-application framework that is responsible for:
- Negotiating resources from the Resource Manager
- Monitoring the status of the containers
- Coordinating the execution of the application
graph TD
A[Client] --> B[Resource Manager]
B --> C[Node Manager]
C --> D[Container]
D --> E[Application Master]
E --> F[Container]
The YARN architecture provides several benefits, including:
- Scalability: YARN can handle large-scale clusters with thousands of nodes and applications.
- Flexibility: YARN supports a variety of application types, including batch processing, interactive queries, and real-time streaming.
- Efficiency: YARN optimizes resource utilization by dynamically allocating resources to applications based on their needs.
Overall, understanding the YARN architecture is crucial for effectively deploying and managing Hadoop clusters, as well as developing and running applications on the Hadoop platform.