I spent several hours tracing in production (updating the code a dozen times with extra logging) to identify the actual path the lemmy_server code uses for outbound federation of votes to subscribed servers.

Major popular servers, Beehaw, Leemy.world, Lemmy.ml - have a large number of instance servers subscribing to their communities to get copies of every post/comment. Comment votes/likes are the most common activity, and it is proposed that during the PERFORMANCE CRISIS that outbound vote/like sharing be turned off by these overwhelmed servers.

pull request for draft:

https://github.com/LemmyNet/lemmy/compare/main...RocketDerp:lemmy_comment_votes_nofed1:no_federation_of_votes_outbound0

EDIT: LEMMY_SKIP_FEDERATE_VOTES environment variable

    • RoundSparrow@lemmy.mlOPM
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      1 year ago

      ok, I figured out how to get Rust to match the enum, is there a way to do this with match instead of if statements?

      +    if let AnnouncableActivities::UndoVote(_) = activity {
      +      warn!("zebratrace310 SKIP UndoVote");
      +    } else if let AnnouncableActivities::Vote(_) = activity {
      +      warn!("zebratrace310A SKIP Vote");
      +    } else {
      +      warn!("zebratrace311 send");
      +      AnnounceActivity::send(activity.clone().try_into()?, community, context).await?;
      +    };
      

      Code seems to work great, blocks UndoVote/Vote but does the send on comment reply.

      • kkard2@lemmy.ml
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        1 year ago

        more “correct” way would be this:

        match activity {
            AnnouncableActivities::UndoVote(_) => warn!("zebratrace310 SKIP UndoVote"),
            AnnouncableActivities::Vote(_) => warn!("zebratrace310A SKIP Vote"),
            _ => {
                warn!("zebratrace311 send");
                AnnounceActivity::send(activity.clone().try_into()?, community, context).await?;
            },
        }
        

        here it is in the rust book: https://doc.rust-lang.org/stable/book/ch06-02-match.html

        • RoundSparrow@lemmy.mlOPM
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          1 year ago

          ool. I found the syntax for multiple hits, so I was looking for:

          match activity {
              AnnouncableActivities::UndoVote(_)  |
              AnnouncableActivities::Vote(_) => {
                  warn!("zebratrace310 SKIP federating Vote/UndoVote");
              },
              _ => {
                  warn!("zebratrace311 send");
                  AnnounceActivity::send(activity.clone().try_into()?, community, context).await?;
              },
          }
          

          Thank you.