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I have a few queries regarding the backend of lemmy (lemm.ee)

submitted 2 years ago by [email protected] to c/[email protected]

9 comments fedilink hide all child comments

I made a post on [email protected] but it was not getting any responses so decided to ask here where people have experience in hosting lemmy instances.

I am not sure how cross-posting works here so I'm just going to paste the link to the original post https://lemm.ee/post/24869.

The main query I have is how is data partitioned over instances when I'm participating in communities in other instances.

You can post your answers here or there.

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[–] [email protected] 3 points 2 years ago (1 children)

[email protected] is for open-ended questions, not questions regarding lemmy :)

[–] [email protected] 2 points 2 years ago (1 children)

I wanted to ask lemmy about lemmy :(

[–] [email protected] 4 points 2 years ago

Use just regular [email protected]

[–] [email protected] 2 points 2 years ago

#lemmy:matrix.org matrix chat room would be a good place to ask or even maybe [email protected]

[–] [email protected] 2 points 2 years ago* (last edited 2 years ago) (1 children)

Looked over your other post,

Your instance A replicates or really caches the content from C@B indefinitely, if you are subscribed to it (or if anyone on your instance is subscribed). When you make a post on C@B your instance transmits that post data to B. Other instances subscribed to C@B will get your post when they receive cache updates. As long as the instances aren't overloaded it is a pretty snappy process in my experience.

Pictures are not replicated but hosted on the instance of the user posting them. Post/Comment data is cached. Your instance will store a cache of all the subscribed communities. Even with a large number of subscriptions all that data is just text and gets filed into the database without consuming much space at all.

Edit: just some things I've read while setting up my instance. Pretty sure that's accurate.

[–] [email protected] 2 points 2 years ago

Thanks! That clears things up a bit.

So all text and metadata is kind of replicated but "heavier" stuff only resides on the original instance.

Your instance will store a cache of all the subscribed communities

I'm assuming more the number of communities, more the instance has to periodically probe and retrieve cache updates. Hopefully these are just deltas, so the updates are small.

However, for large instances, these periodic updates can become resource-hungry activities

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