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Meaning it will only fetch what is being actively looked at?
So when an external community is subscribed to from an account located on your located instance, from the point of subscribing forward, your local instance will begin downloading every single post that will ever be made to that subscribed communty, regardless of who posted it?
This is the main point of confusion to me. From my current understanding, it feels as if it contradicts what you had previously said:
If it's already pulling in all posts and comments on that community, what use is specifically storing anything that the users do on that community? Would it not be already stored?
It works a lot like like email between instances. Let’s call your self hosted instance “A” and the popular remote instance “B.”
User on A searches for “poodles” and finds a community !poodles@B. When they click the search results: A sends B mail saying “send me the last 10 posts for poodles.” B sends A mail with the posts and the user sees the posts, but none have comments.
If nothing else happens then those 10 posts will just hang out doing nothing on A, but if the user clicks subscribe then A sends another mail to B saying “my user wants to follow poodles.” B replies saying “cool, I’ll send you everything from poodles now.” Now, anything a post or comment happens B checks lots list of subscribing instances and sends copies of them.
If user on A comments on !poodles@B or posts, it creates it on A but sends a mail to B saying “here is some new stuff for poodles!”
Thank you for the explanation!
Unfortunately, it seems, if I understand understand correcly, that this is not sustainable in the long term for small instances/servers. If Lemmy continues to grow in popularity, then the influx of content will continue to increase, thereby pushing small servers out of participation due to lack of resources. The data storage requirements, I fear, will become a very limiting issue.
I feel that if servers only tracked what their users directly participated in (i.e. only save comments, and posts directly made by the user), this issue would not be as problematic.
For example, I would like to host my own instance with only my account on it. I was initially hoping that my data storage requirements would only be directly proportional to how much I, as a user, use Lemmy; the server would only need to store my personally created data, and nothing else. Unfortunately, however, it appears that I would also have to have enough resources to sustain everyone elses posts which is a far steeper requirement.
Media takes up space. The text from posts and comments is trivial. The database for lemmy.world is only 25 GB. Wikipedia text is only 21 GB.