It looks like the lack of persistent storage for the federated activity queue is leading to instances running out of memory in a matter of hours. See my comment for more details.
Furthermore, this leads to data loss, since there is no other consistency mechanism. I think it might be a high priority issue, taking into account the current momentum behind growth of Lemmy…
Using Couchbase as your eventual consistency database is perfect for this scenario. It’s designed for this type of thing. Even if systems are offline for a few days they will queue up and replicate when they come back online. Cruise ships use it for this very reason.
Can you provide a link? Only thing I see on Couchbase is for NoSQL databases.
Actually XDCR is not available in the community edition so that option is gone. Sorry about that.
It is a NoSQL database but the SQL syntax is ANSI SQL compliant. If you moved the queues to Couchbase and let it handle the replication and consistency, you wouldn’t have to code for it.
Thanks for checking.
We don’t need full database replication. We are just replicating activities that other servers are subscribed to. So the Comments table, only some of the rows will be “replicated”. Not sure if/how CouchBase handles this.
Buckets are like databases in traditional relational databases. Here’s the doc on how to filter which documents get replicated.
https://docs.couchdb.org/en/stable/replication/intro.html#controlling-which-documents-to-replicate
Sorry. I didn’t realize XDCR was not available in the community edition.