Boosting NestJS Performance with PM2 Multiple Instances

Currently, I have a NestJS application that I typically deploy using PM2 in cluster mode with multiple instances running.

One thing to note is that NestJS utilizes the Singleton pattern for its services. This is crucial for some of my features, as it allows me to access service properties globally and maintain their values.

My concern is whether or not using PM2 cluster mode will cause any issues. Can NestJS share this Singleton pattern across instances?

Note: I am hesitant to introduce additional complexity to the project, such as installing Redis to manage global data storage.

Answer №1

When working in a clustered environment using PM2, each instance within the cluster operates as its own separate process, meaning they do not directly share memory. NestJS services act as singletons within a single process, making it challenging to share data between instances.

If you are depending on a singleton service within a NestJS instance and utilizing PM2 cluster mode, you may encounter issues as each instance functions independently, without changes reflecting across others.

To overcome this obstacle without introducing added complexity from external tools, you can consider implementing in-memory caching within your NestJS application. For instance, leveraging a caching library such as memory-cache or utilizing the built-in CacheModule from NestJS enables sharing of data between requests within the same instance.

Please let me know if this information is helpful, I can also provide some code examples for further clarification.

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