> Finally, let’s revisit that global state problem. After the contagious deadlock bug, we concluded we need to evolve past a single cluster. So we took on a project we call “regionalization”, which creates a two-level database scheme. Each region we operate in runs a Corrosion cluster with fine-grained data about every Fly Machine in the region. The global cluster then maps applications to regions, which is sufficient to make forwarding decisions at our edge proxies.
This tier approach makes a lot of sense to mitigate the scaling limit per corrosion node. Can you share how much data you wind up tracking in each tier in practice?
How concise is the entry for each application -> [regions] table? Does the constraint of running this on every node mean that this creates a global limit for number of applications? It also seems like the region level database would have a regional limit for the number of Fly machines too?