Microservices Continued!

Learn more about microservices

aggregate

a unit of consistency that consists of one or many entities, with one of them serving as the aggregate root

how do we avoid eager loading

always reference the aggregate by identity, not through direct references to the instance itself

Command Query Responsibility Segregration (CQRS)

separates the read and write models from each other

result of CQRS

increases reliability, stability and availability. reads and writes can be scaled independently of each other

saga theory

manage business transactions that make use of compensating actions to manage inconsistency

saga

collection of sub transactions t1 to tn, which each have a compensating transaction c1 to cn

issues of microservices 1

additional complexity of creating a distributed system

solution for issue 1

implement inter-process communication mechanisms

issues of microservices 2

writing automated tests that involve multiple services is challenging

issues of microservices 3

deploying features that span multiple services requires careful coordination between various development teams