Granularity

defines the size of each component, part, or module in a distributed system.

The size is about what the module does—the features.
An impact on modularity, reusability, testability, performance, security, and reusability.
Modularity: smaller size leads to more modules.
Reusability: the smaller size makes it easier to maintain the features.
Testability: the reduced scope, makes the tests easier to maintain.
Performance: facilitates the optimization of a module. (not the whole system)
Security: it is easier to protect the module.
Smaller modules have some advantages: modularity, easier maintenance, distribution, security, and privacy.
Smaller modules also have some disadvantages: communication and infrastructure complexity, latency, performance, and global maintenance.
What is the right granularity? (future post…)