‘Should it be a Microservice?’

Often when considering, or working with Microservices, we are uncertain whether some component should be a Microservice. This component might be a mailer, price calculator, facebook connector, message queue facade, or anything that seems to benefit from being an autonomous component. The checklist below means to give a sense whether you need a Microservice or maybe it’s probably an overkill tool for your needs.

Although all the reasons below are valid and important to consider, take the ‘gamification’ and scoring part with a sense of humor.

Answer all the questions and sum your score

1.  Start with zero, add or subtract points based on the questions below

2. Different teams: Will the new component be developed by a separate team?

3. Dedicated technology: Is the component likely to be developed using a different programming language?

4. Simplicity: When not extracted out, do things get too complex to “fit in your head”?

5. Failure isolation: Should and can this component stay alive and provide value when its collaborators crashed?

6. Operational complexity: Do you already have a Microservice infrastructure?

8. Granular deployment: Is this functionality likely to be updated at a different pace than other components so you can update it without the need to update its collaborators?

9. Stateful service: Does it expose API, DB or any other stateful activity?

10. Ubiquitous language: Is this functionality represents an isolated product domain like a stand-alone feature or having a dedicated product manager?

11. Independent scale: Is this component’s traction is likely to be different than others and might need to scale independently?

12. Dedicated infrastructure: Does the component deserver a unique hardware spec like GPU or extensive RAM support?

13. Change protection: Might this component get replaced sometime soon by another implementation, for example by a 3rd party product?

14. Avoid chatty flow: Is this functionality invoked multiple times during each flow (e.g. log, trace, etc)?

 

🗒️ Results - should it be a Microservice?

0–5 points

😂 Seriously? a function might be enough to satisfy your needs

5–10

🤦‍♂️ Oh No. Don’t be a drama queen, read about package managers, modules and other leaner isolation techniques

10–15

🤔 Hmm. If you don’t already have a Microservice infrastructure the ROI is likely to be negative

15–20

👍 Maybe. The value doesn’t seem critical - at least keep the overhead low

20–30

👌 Probably yes, mostly if it’s not your first Microservice

30–50

✌ Absolutely, this is by itself is a good reason to move toward a Microservice architecture

Final wording

Obviously, the scoring is just a nice game which shouldn’t be taken too seriously 😀
I’m curious, did the score made sense? feel free to suggest improvements

© 2021 Yoni Goldberg. All rights reserved.