Incremental migration plan in Microservices - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an incremental migration plan in microservices?

An incremental migration plan breaks down the move from a monolithic system to microservices into small, manageable steps. It allows gradual transition without stopping the whole system.

beginner

Why is incremental migration preferred over a big bang migration?

Incremental migration reduces risk by allowing testing and validation at each step. It avoids system downtime and lets teams fix issues early before moving on.

intermediate

Name a common strategy used in incremental migration plans.

The strangler pattern is common. It gradually replaces parts of the old system with new microservices until the old system is fully replaced.

intermediate

What role does API gateway play in incremental migration?

An API gateway routes requests between old and new services during migration. It helps manage traffic and ensures smooth communication.

advanced

How do you handle data consistency during incremental migration?

Data consistency is handled by synchronizing databases or using event-driven communication to keep data updated across old and new services.

What is the main benefit of an incremental migration plan?

A Eliminates need for new services

B Completes migration in one step

C Requires no testing

D Reduces risk by gradual transition

Incremental migration reduces risk by allowing gradual transition and testing at each step.

Which pattern is commonly used in incremental migration?

A Singleton pattern

B Factory pattern

C Strangler pattern

D Observer pattern

The strangler pattern gradually replaces parts of the old system with new microservices.

During incremental migration, what component manages routing between old and new services?

A Database

B API gateway

C Load balancer

D Cache

API gateway routes requests between old and new services during migration.

How is data consistency maintained during incremental migration?

A Synchronizing databases or event-driven updates

B Ignoring old data

C Using only one database

D Manual data entry

Data consistency is maintained by synchronizing databases or using event-driven communication.

What is a risk of big bang migration compared to incremental migration?

A High risk of system downtime

B Easier testing

C Lower cost

D Faster deployment

Big bang migration risks system downtime due to all changes happening at once.

Explain the steps involved in an incremental migration plan for microservices.

Think about how to move from old to new system safely and gradually.

Describe how data synchronization can be achieved during incremental migration.

Consider how data stays accurate when two systems run together.