Manageability

Each Microservice can be separately versioned, upgraded, and scaled without impacting the rest of the system. This enables running multiple development streams in parallel with independent delivery cycles aligned with the business demands. If we take a system which distributes news to the employees of a company as an example, and the notification service needs an upgrade to support push notifications to mobile phones, it can be upgraded without any downtime in the system and without impacting the rest of the application. The team delivering the notification service can function at its own pace without having a dependency on a big bang release or a product release cycle.

The ability to scale each service independently is also a key advantage in distributed systems. This lets the operations team increase or decrease the number of instances of a service dynamically to handle varying loads. A good example is systems which require batch processing. Batch jobs which run periodically, say once in a day, only require the batch processing service to be running for a few hours. This service can be turned on and scaled up for the duration of batch processing and then turned off to better utilize the computing resources among other services.