In a monolithic architecture, what is a common drawback when multiple modules share a library?

In a monolithic architecture, what is a common drawback when multiple modules share a library?

• A. Independent deployment of modules
• B. Changes to one area can potentially affect the entire application
• C. Deployment speed is faster with shared libraries
• D. Easier testing due to monolithic structure

Answer: (B)

When multiple modules share a library in a monolithic app, changes to that library create tight coupling across the system. A modification to the shared library can affect any module that relies on it, risking regressions or behavioral changes beyond the intended area. Because the whole application is typically deployed as a single unit, a change in the library often means redeploying the entire monolith, expanding the blast radius and slowing releases. This ripple effect—where one area’s updates can impact the entire application—is the central drawback of sharing libraries in a monolithic architecture. Independent deployment or faster deployment due to shared libraries aren’t typical benefits in this setup, and testing can become more complex due to the need to validate the entire integrated system after changes.

When multiple modules share a library in a monolithic app, changes to that library create tight coupling across the system. A modification to the shared library can affect any module that relies on it, risking regressions or behavioral changes beyond the intended area. Because the whole application is typically deployed as a single unit, a change in the library often means redeploying the entire monolith, expanding the blast radius and slowing releases. This ripple effect—where one area’s updates can impact the entire application—is the central drawback of sharing libraries in a monolithic architecture. Independent deployment or faster deployment due to shared libraries aren’t typical benefits in this setup, and testing can become more complex due to the need to validate the entire integrated system after changes.