3
• Steep learning curve: Monolithic applications often
have a large code base. But the individual developers
are often working on a very small subset of the
codebase. At first glance, the lines of code create a
psychological bottleneck for developers. Moreover,
since the application is tightly coupled, developers
usually need to know how others invoke the code.
Thus, the overall onboarding time for a new developer
is large. Even the experienced developers find it
hard to make changes to modules that have not been
maintained well. This creates a knowledge gap that
widens over time.
• Application scaling: Typically, a monolithic
application can only be scaled vertically. It is possible
to scale the application horizontally, but you need to
determine how each subsystem maintains its internal
state. In any case, the application requires resources for
all subsystems. Resources can’t be selectively provided
to subsystems under load. Thus, it is an all-or-nothing
scenario with a monolithic application. This is often a
costly affair.
When faced with challenges, organizations look for alternative
architectures to address these issues.
Microservice Architecture
Microservice architecture is an alternative to the monolithic architecture
(see Figure1-1). It converts the single application to a distributed system
with the following characteristics.
Chapter 1 IntroduCtIon totraefIk
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