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Discussion on: CQRS In Microservices – Breaking the Rules

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jeastham1993 profile image
James Eastham

Interesting point on the logical service Kasey. So one logical service could well be a combination of two separate read/write services?

In the use case, I have in mind, it sounds the same as yours. Having two different scaling knobs for reading vs writing is extremely useful. The volume of reading data is MUCH higher than the written data.

So a separate service handling that seems exactly right.

In most services I've written prior to this, I've still kept a clear distinction between C and Q. But rather than having completely different knobs, they run under one knob.

Interesting comments though, thanks for your input.

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Kasey Speakman • Edited

So one logical service could well be a combination of two separate read/write services?

Sure, if we are talking about stateless services. The database is probably going to require scaling before the compute resources do. When you do need to scale compute due to read load, it probably doesn't cost that much memory to also carry command handling code along for the ride even if it is mostly dormant. And you still retain the option to split the command and query sides off into different services if the need arises.