known elsewhere pruned

1 files changed, 5 insertions, 0 deletions

diff --git a/src/document/sync.rs b/src/document/sync.rs
index eed0024..114b538 100644
--- a/src/document/sync.rs
+++ b/src/document/sync.rs
@@ -842,6 +842,11 @@ impl SyncSession {
         peer: &str,
         now: Instant,
     ) -> (usize, usize) {
+        // Pruned here too, on every message from the peer: `known_to_peer` prunes only
+        // when another parent brings something, which stops when the peer is no longer
+        // covered by one.
+        self.known_elsewhere
+            .retain(|_, at| now.saturating_duration_since(*at) < KNOWN_ELSEWHERE_KEPT);
         let mut asked = (0, 0);
         for hash in self.state.their_need.iter().flatten() {
             if let Some(at) = self.known_elsewhere.remove(hash) {