Core Modules
Node.js Cluster
Node.js Cluster Module
Node.js Cluster module scales apps across CPU cores with workers.
Introduction to Node.js Cluster Module
The Node.js Cluster module allows you to create child processes (workers) that share the same server port, enabling you to effectively utilize multi-core systems. By using the cluster module, you can distribute the load across multiple cores, improving the performance and scalability of your Node.js applications.
How Cluster Module Works
The Cluster module operates by creating multiple instances of your Node.js application, each running on a separate core. These instances share the same server port and can handle incoming requests concurrently. The module uses a master process to manage worker processes, distributing incoming connections among them.
Whenever a worker crashes or exits, the master process can create a new worker to replace it, ensuring continuous availability.
Setting Up a Basic Cluster
To set up a basic cluster, you'll need to require the 'cluster' module along with the 'http' and 'os' modules. The following example demonstrates how to create a simple HTTP server that uses clustering to handle requests:
Handling Worker Events
In a clustered environment, handling worker events is crucial for monitoring and maintaining the health of your application. You can listen to various events such as 'online', 'listening', and 'exit' to log activity or take action when a worker process changes state.
Advantages of Using Cluster Module
Using the Cluster module offers several advantages:
- Improved Performance: By utilizing all CPU cores, your application can handle more requests concurrently.
- Fault Tolerance: Automatic worker replacement ensures that your application remains available even if a worker crashes.
- Scalability: Easily scale your application by forking additional worker processes.
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