Tensegrity

There was a bit of a to do lately with Cloudflare’s Durable Objects which prompted me to go looking for anyone who has done replicated SQL state machines using SQLite. And it turns out there’s a lot of them, which is kind of cool. Couple of different strategies used, of course, ranging from a CDC Continue reading

Wanted to collect here in this post the foundational papers that I used to create Delos and its component pieces. Continue reading

One of the early decisions I made – or, rather, stumbled into – was the reliance on the flooding cycle of the Fireflies rings. Recall that in Fireflies, we create K rings that contain all the members, but order them differently by ring – pseudo randomly, using hashing. The way these rings are constructed provides Continue reading

One of the recurring design patterns in Apollo is the use of a cleverly constructed random graph structure from the original Fireflies paper. I discussed this structure in my post on consensus in Delos. In that post, I focused on the use of this graph structure to form byzantine fault tolerant subset within a larger Continue reading

Silly me. I just recently realized that the t4g.small instances I’ve been eyeing have the AWS Nitro enclave stuff. This is horrendously cool technology that I thought was out of my reach given that I was focusing on cheap ass EC2 instances. Well, no need to ignore the Nitro enclaves any more. Following the link Continue reading

I finally got the Sky application compiled using teh GraalVM native-image tool. As you can see from the configuration for the maven plugin, it’s pretty darn easy. I do have reflection and other config generated using teh native agent instrumentation, It’s a very easy process, but somewhat bewilderingly explained from what I could find. But Continue reading

So I finally laid an issue to rest that has been open for a while. This is the addition of a “Zookie” like functionality to the Apollo and thus Sky Oracle API. The Zookie is basically an opaque data type that represents comparable distributed time. Time is a strange beast in distributed systems, of course Continue reading

I was a bit surprised at how easy it was to get the Sky Oracle service API up n’ running over GRPC. It’s a rather large API (for my tastes, anyway) and so I wasn’t really looking forward to discovering all that pleasure but as I said it did not turn out to be a Continue reading

Getting to the first milestone allowed me to really start experimenting with long running Sky nodes for… well… really the first time. Well, at least for Sky. I had done a lot of performance work on Apollo, but that was quite a while ago. A whole lot has changed and new subsystems introduced. So while Continue reading