fix catch-up / compaction in general

1 files changed, 19 insertions, 1 deletions

diff --git a/src/state.rs b/src/state.rs
index 4c7282f..f9da5e0 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -531,6 +531,20 @@ impl AppState {
         // Sync states were reset under the document lock by the swap itself.
         self.publish_change();
 
+        // Tell peers about the new epoch now instead of with the next keepalive (up to a
+        // keepalive interval later): sync with peers already on it resumes right away,
+        // and peers that never saw the commit start catching up.
+        let keepalive = crate::peer::local_keepalive(self).await;
+        for (id, _) in &peers {
+            if let Err(error) = self
+                .transport
+                .send_message(id, &transport::ParsedMessage::Ping(keepalive.clone()))
+                .await
+            {
+                debug!(peer = %id, error = %format!("{error:#}"), "Epoch announcement failed");
+            }
+        }
+
         for (id, _) in peers {
             let _ = self.sync_events.send(SyncEvent::PeerNeedsSync(id));
         }
@@ -669,8 +683,12 @@ impl Host for AppState {
                     // Reset every peer's sync state before the lock is released, so no
                     // message is generated from or applied to a state that describes the
                     // old document. (Lock order doc -> peer, as in sync generation.)
+                    let now = Instant::now();
                     for peer in state.peer_states.blocking_read().values() {
-                        peer.blocking_lock().reset_sync();
+                        let mut peer = peer.blocking_lock();
+                        peer.reset_sync();
+                        // A fresh start, not an idle sync: no heal re-handshake for it.
+                        peer.last_sync_rx = Some(now);
                     }
                     Ok(old_doc)
                 })