4 ms·
I don't think it meets the low latency requirement. It's a CAP theorem joke. Can't have strong consistency across multiple data centers with low latency because
by arielweisberg 10y ago
I don't think it meets the low latency requirement. It's a CAP theorem joke. Can't have strong consistency across multiple data centers with low latency because you have to read/write from a quorum of DCs in order to maintain availability in case one DC goes down.
- nickpsecurity 10y agoOh yeah. Low latency eould be saying too much. I think its worst-case for strong-consistency is around 30 seconds or so. Anyway, closest to to low-latency part would be NonStop or OpenVMS clusers across redundant, leased lines. They're fast, scale well at HW level, use ACID databases, and high-availability. Commonly used in transaction processing. One VMS cluster survived 9/11 attack without losing a single transaction. NonStop does up to five 9's. Id be interested in the CAP analysis of these older methods.
- arielweisberg 10y agoIt also depends on your definition of data center. It's really multi-region that is the problem since then it's the speed of light you have to deal with. Quorum across some data centers is fast enough that it's not hard to manage in new applications.
- nickpsecurity 10y agoThat makes a lot of since. Many of the NonStop and VMS clusters were in same country but far enough from each other to isolate against many disasters. Could be why they did better on the issue.
- mirekrusin 10y agoYou can always use quantum entanglement to help a (qu)bit.