Otherwise, if we have a lot of medium sized instances but the most popular communities are hosted on just a few huge instances, doesn’t that defeat the purpose of distributing load across many instances?
If that’s the case, how do we solve the cumbersome user experience of having to subscribe to the same community over and over again across a ton of medium instances?
If you post to a community that is hosted on a different server, your post is still stored on your home server. The community server is basically just the aggregator. If the community or server goes down the posts are still hosted on their respective home servers.
So if a home server goes down will those posts disappear from the community server? And what if it goes down temporarily and not permanently, do the posts stored on the home server temporarily disappear?