The CAP Theorem's Eventually Useful Guarantees
Description
A screenshot of a Twitter thread that satirizes jargon from distributed systems architecture. The initial tweet is from the popular account 'I Am Devloper' (@iamdevloper) and presents a dialogue: '- our system is eventually consistent - right, so it's not consistent - well it is, just not right away. it eventually is - so...it's not.' This exchange highlights the common misunderstanding or skepticism surrounding the concept of eventual consistency. Following this, a reply from Erik Seaberg (@ErikSeaberg) extends the joke: 'I see a lot of potential in delivering "eventually available."' Finally, Ronen Lahat (@Ronenl) adds the punchline: 'Or eventually partition tolerant.' The humor stems from applying the 'eventually' qualifier, which is a legitimate concept for consistency, to the other two non-negotiable guarantees of the CAP theorem (Availability and Partition Tolerance), rendering them meaningless and absurd
Comments
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My project plan is 'eventually complete.' It's not done, but it will be. Theoretically. Don't ask for the JIRA ticket, it's 'eventually available.'
Enterprise take on CAP: eventually consistent, occasionally available, and permanently partitioned by the org chart
After 20 years of building distributed systems, I've learned that 'eventually consistent' is just engineering speak for 'we've accepted that physics exists and given up on the illusion of simultaneity' - much like how 'eventually available' is code for 'we promise it'll work, just not when you need it for the demo.'
This thread perfectly captures the existential crisis of explaining CAP theorem to stakeholders: 'It's consistent... eventually... which means it's not... but it will be... so it is... but not now.' Meanwhile, the reply about 'eventually available' hits different when you've been on-call for a system that's 'eventually' recovering from a network partition at 3 AM. The real joke? We've all been in that first conversation, desperately trying to convince someone that 'eventual' is a feature, not a bug - right before the partition tolerance comment reminds us we're just picking which consistency guarantee we're willing to sacrifice today
If your SLA uses future tense, your consensus algorithm is Marketing, not Raft
We’re CAP-compliant: pick any two now - get the third after the cache TTL and the network partition heals
Eventual consistency: where 'consistent' means 'after your on-call shift ends and you've already escalated to the DBAs'
I'll eventually understand this post Comment deleted
Eventually sustainable Comment deleted
We're eventually dead ( Comment deleted