[chrsig]

One of my desires would be for it to be persistent. Hopefully with the option of different storage tiers, so as logs became older they could be moved to less costly medium and transparently fetched when requested.

Having an event sourced system doesn't make much sense unless you maintain messages from the start of the system. You can snapshot state and resume in order to quickly rebuild from a known good state. That doesn't help if there was a logic error corrupting every state from the start, and a full rebuild is required.

I'm unsure how redis streams behave with regard to cache eviction, nor am I familiar enough with rabbitmq to comment on it's behavior. It's been 10 years since I used either, and at the time neither were good solutions for a log based system.

[coder543]

Redis doesn't do key eviction by default. Everything lives forever, unless you tell it otherwise. Of course, it is recommended to turn on some form of persistence (and configure backups) so that things don't disappear if the server restarts.