filter out old gossip pull requests (#11448)

* init

* builds

* stats

* revert

* tests

* clippy

* add some jitter

* shorter jitter timer

* update

* fixup! update

* use saturating_sub

* fix filters

core/src/cluster_info.rs

@@ -1746,7 +1746,7 @@ impl ClusterInfo {
                 "generate_pull_responses",
                 &self.stats.generate_pull_responses,
             )
-            .generate_pull_responses(&caller_and_filters);
+            .generate_pull_responses(&caller_and_filters, now);
 
         self.time_gossip_write_lock("process_pull_reqs", &self.stats.process_pull_requests)
             .process_pull_requests(caller_and_filters, now);

core/src/crds_gossip.rs

@@ -159,8 +159,9 @@ impl CrdsGossip {
     pub fn generate_pull_responses(
         &self,
         filters: &[(CrdsValue, CrdsFilter)],
+        now: u64,
     ) -> Vec<Vec<CrdsValue>> {
-        self.pull.generate_pull_responses(&self.crds, filters)
+        self.pull.generate_pull_responses(&self.crds, filters, now)
     }
 
     pub fn filter_pull_responses(

core/src/crds_gossip_pull.rs

@@ -237,8 +237,9 @@ impl CrdsGossipPull {
         &self,
         crds: &Crds,
         requests: &[(CrdsValue, CrdsFilter)],
+        now: u64,
     ) -> Vec<Vec<CrdsValue>> {
-        self.filter_crds_values(crds, requests)
+        self.filter_crds_values(crds, requests, now)
     }
 
     // Checks if responses should be inserted and
@@ -371,15 +372,45 @@ impl CrdsGossipPull {
         &self,
         crds: &Crds,
         filters: &[(CrdsValue, CrdsFilter)],
+        now: u64,
     ) -> Vec<Vec<CrdsValue>> {
         let mut ret = vec![vec![]; filters.len()];
+        let msg_timeout = CRDS_GOSSIP_PULL_CRDS_TIMEOUT_MS;
+        let jitter = rand::thread_rng().gen_range(0, msg_timeout / 4);
+        let start = filters.len();
+        //skip filters from callers that are too old
+        let future = now.saturating_add(msg_timeout);
+        let past = now.saturating_sub(msg_timeout);
+        let recent: Vec<_> = filters
+            .iter()
+            .filter(|(caller, _)| caller.wallclock() < future && caller.wallclock() >= past)
+            .collect();
+        inc_new_counter_info!(
+            "gossip_filter_crds_values-dropped_requests",
+            start - recent.len()
+        );
+        if recent.is_empty() {
+            return ret;
+        }
+        let mut total_skipped = 0;
         for v in crds.table.values() {
-            filters.iter().enumerate().for_each(|(i, (_, filter))| {
+            recent
+                .iter()
+                .enumerate()
+                .for_each(|(i, (caller, filter))| {
+                    //skip values that are too new
+                    if v.value.wallclock()
+                        > caller.wallclock().checked_add(jitter).unwrap_or_else(|| 0)
+                    {
+                        total_skipped += 1;
+                        return;
+                    }
                     if !filter.contains(&v.value_hash) {
                         ret[i].push(v.value.clone());
                     }
                 });
         }
+        inc_new_counter_info!("gossip_filter_crds_values-dropped_values", total_skipped);
         ret
     }
     pub fn make_timeouts_def(
@@ -636,6 +667,62 @@ mod test {
         }
     }
 
+    #[test]
+    fn test_generate_pull_responses() {
+        let mut node_crds = Crds::default();
+        let entry = CrdsValue::new_unsigned(CrdsData::ContactInfo(ContactInfo::new_localhost(
+            &Pubkey::new_rand(),
+            0,
+        )));
+        let node_pubkey = entry.label().pubkey();
+        let node = CrdsGossipPull::default();
+        node_crds.insert(entry, 0).unwrap();
+        let new = CrdsValue::new_unsigned(CrdsData::ContactInfo(ContactInfo::new_localhost(
+            &Pubkey::new_rand(),
+            0,
+        )));
+        node_crds.insert(new, 0).unwrap();
+        let req = node.new_pull_request(
+            &node_crds,
+            &node_pubkey,
+            0,
+            0,
+            &HashMap::new(),
+            PACKET_DATA_SIZE,
+        );
+
+        let mut dest_crds = Crds::default();
+        let dest = CrdsGossipPull::default();
+        let (_, filters, caller) = req.unwrap();
+        let mut filters: Vec<_> = filters.into_iter().map(|f| (caller.clone(), f)).collect();
+        let rsp = dest.generate_pull_responses(&dest_crds, &filters, 0);
+
+        assert_eq!(rsp[0].len(), 0);
+
+        let new = CrdsValue::new_unsigned(CrdsData::ContactInfo(ContactInfo::new_localhost(
+            &Pubkey::new_rand(),
+            CRDS_GOSSIP_PULL_MSG_TIMEOUT_MS,
+        )));
+        dest_crds
+            .insert(new, CRDS_GOSSIP_PULL_MSG_TIMEOUT_MS)
+            .unwrap();
+
+        //should skip new value since caller is to old
+        let rsp =
+            dest.generate_pull_responses(&dest_crds, &filters, CRDS_GOSSIP_PULL_MSG_TIMEOUT_MS);
+        assert_eq!(rsp[0].len(), 0);
+
+        //should return new value since caller is new
+        filters[0].0 = CrdsValue::new_unsigned(CrdsData::ContactInfo(ContactInfo::new_localhost(
+            &Pubkey::new_rand(),
+            CRDS_GOSSIP_PULL_MSG_TIMEOUT_MS + 1,
+        )));
+
+        let rsp =
+            dest.generate_pull_responses(&dest_crds, &filters, CRDS_GOSSIP_PULL_MSG_TIMEOUT_MS);
+        assert_eq!(rsp[0].len(), 1);
+    }
+
     #[test]
     fn test_process_pull_request() {
         let mut node_crds = Crds::default();
@@ -664,7 +751,7 @@ mod test {
         let mut dest = CrdsGossipPull::default();
         let (_, filters, caller) = req.unwrap();
         let filters: Vec<_> = filters.into_iter().map(|f| (caller.clone(), f)).collect();
-        let rsp = dest.generate_pull_responses(&dest_crds, &filters);
+        let rsp = dest.generate_pull_responses(&dest_crds, &filters, 0);
         dest.process_pull_requests(&mut dest_crds, filters, 1);
         assert!(rsp.iter().all(|rsp| rsp.is_empty()));
         assert!(dest_crds.lookup(&caller.label()).is_some());
@@ -688,7 +775,7 @@ mod test {
         let mut node_crds = Crds::default();
         let entry = CrdsValue::new_unsigned(CrdsData::ContactInfo(ContactInfo::new_localhost(
             &Pubkey::new_rand(),
-            0,
+            1,
         )));
         let node_pubkey = entry.label().pubkey();
         let mut node = CrdsGossipPull::default();
@@ -696,7 +783,7 @@ mod test {
 
         let new = CrdsValue::new_unsigned(CrdsData::ContactInfo(ContactInfo::new_localhost(
             &Pubkey::new_rand(),
-            0,
+            1,
         )));
         node_crds.insert(new, 0).unwrap();
 
@@ -735,7 +822,7 @@ mod test {
             );
             let (_, filters, caller) = req.unwrap();
             let filters: Vec<_> = filters.into_iter().map(|f| (caller.clone(), f)).collect();
-            let mut rsp = dest.generate_pull_responses(&dest_crds, &filters);
+            let mut rsp = dest.generate_pull_responses(&dest_crds, &filters, 0);
             dest.process_pull_requests(&mut dest_crds, filters, 0);
             // if there is a false positive this is empty
             // prob should be around 0.1 per iteration

core/tests/crds_gossip.rs

@@ -436,7 +436,7 @@ fn network_run_pull(
                         let rsp = node
                             .lock()
                             .unwrap()
-                            .generate_pull_responses(&filters)
+                            .generate_pull_responses(&filters, now)
                             .into_iter()
                             .flatten()
                             .collect();