simplifies pull-responses handling (#33743)

Following:
#33722
from pubkey in PullResponse is no longer used in processing
pull-responses and so the code can be simplified.

gossip/src/cluster_info.rs

@@ -80,7 +80,7 @@ use {
     solana_vote_program::vote_state::MAX_LOCKOUT_HISTORY,
     std::{
         borrow::Cow,
-        collections::{hash_map::Entry, HashMap, HashSet, VecDeque},
+        collections::{HashMap, HashSet, VecDeque},
         fmt::Debug,
         fs::{self, File},
         io::BufReader,
@@ -2101,77 +2101,27 @@ impl ClusterInfo {
 
     fn handle_batch_pull_responses(
         &self,
-        responses: Vec<(Pubkey, Vec<CrdsValue>)>,
-        thread_pool: &ThreadPool,
+        responses: Vec<CrdsValue>,
         stakes: &HashMap<Pubkey, u64>,
         epoch_duration: Duration,
     ) {
         let _st = ScopedTimer::from(&self.stats.handle_batch_pull_responses_time);
-        if responses.is_empty() {
-            return;
-        }
-        fn extend<K, V>(hash_map: &mut HashMap<K, Vec<V>>, (key, mut value): (K, Vec<V>))
-        where
-            K: Eq + std::hash::Hash,
-        {
-            match hash_map.entry(key) {
-                Entry::Occupied(mut entry) => {
-                    let entry_value = entry.get_mut();
-                    if entry_value.len() < value.len() {
-                        std::mem::swap(entry_value, &mut value);
-                    }
-                    entry_value.extend(value);
-                }
-                Entry::Vacant(entry) => {
-                    entry.insert(value);
-                }
-            }
-        }
-        fn merge<K, V>(
-            mut hash_map: HashMap<K, Vec<V>>,
-            other: HashMap<K, Vec<V>>,
-        ) -> HashMap<K, Vec<V>>
-        where
-            K: Eq + std::hash::Hash,
-        {
-            if hash_map.len() < other.len() {
-                return merge(other, hash_map);
-            }
-            for kv in other {
-                extend(&mut hash_map, kv);
-            }
-            hash_map
-        }
-        let responses = thread_pool.install(|| {
-            responses
-                .into_par_iter()
-                .with_min_len(1024)
-                .fold(HashMap::new, |mut hash_map, kv| {
-                    extend(&mut hash_map, kv);
-                    hash_map
-                })
-                .reduce(HashMap::new, merge)
-        });
         if !responses.is_empty() {
             let self_pubkey = self.id();
             let timeouts = self
                 .gossip
                 .make_timeouts(self_pubkey, stakes, epoch_duration);
-            for (from, data) in responses {
-                self.handle_pull_response(&from, data, &timeouts);
-            }
+            self.handle_pull_response(responses, &timeouts);
         }
     }
 
     // Returns (failed, timeout, success)
     fn handle_pull_response(
         &self,
-        from: &Pubkey,
         crds_values: Vec<CrdsValue>,
         timeouts: &CrdsTimeouts,
     ) -> (usize, usize, usize) {
         let len = crds_values.len();
-        trace!("PullResponse me: {} from: {} len={}", self.id(), from, len);
         let mut pull_stats = ProcessPullStats::default();
         let (filtered_pulls, filtered_pulls_expired_timeout, failed_inserts) = {
             let _st = ScopedTimer::from(&self.stats.filter_pull_response);
@@ -2446,9 +2396,9 @@ impl ClusterInfo {
                 Protocol::PullRequest(filter, caller) => {
                     pull_requests.push((from_addr, filter, caller))
                 }
-                Protocol::PullResponse(from, data) => {
+                Protocol::PullResponse(_, mut data) => {
                     check_duplicate_instance(&data)?;
-                    pull_responses.push((from, data));
+                    pull_responses.append(&mut data);
                 }
                 Protocol::PushMessage(from, data) => {
                     check_duplicate_instance(&data)?;
@@ -2460,13 +2410,10 @@ impl ClusterInfo {
             }
         }
         if self.require_stake_for_gossip(stakes) {
-            for (_, data) in &mut pull_responses {
-                retain_staked(data, stakes);
-            }
+            retain_staked(&mut pull_responses, stakes);
             for (_, data) in &mut push_messages {
                 retain_staked(data, stakes);
             }
-            pull_responses.retain(|(_, data)| !data.is_empty());
             push_messages.retain(|(_, data)| !data.is_empty());
         }
         self.handle_batch_ping_messages(ping_messages, recycler, response_sender);
@@ -2478,7 +2425,7 @@ impl ClusterInfo {
             stakes,
             response_sender,
         );
-        self.handle_batch_pull_responses(pull_responses, thread_pool, stakes, epoch_duration);
+        self.handle_batch_pull_responses(pull_responses, stakes, epoch_duration);
         self.trim_crds_table(CRDS_UNIQUE_PUBKEY_CAPACITY, stakes);
         self.handle_batch_pong_messages(pong_messages, Instant::now());
         self.handle_batch_pull_requests(
@@ -3212,18 +3159,11 @@ mod tests {
         );
         assert_eq!(
             (0, 0, 1),
-            ClusterInfo::handle_pull_response(
-                &cluster_info,
-                &entrypoint_pubkey,
-                data.clone(),
-                &timeouts
-            )
+            cluster_info.handle_pull_response(data.clone(), &timeouts)
         );
-
-        let entrypoint_pubkey2 = solana_sdk::pubkey::new_rand();
         assert_eq!(
             (1, 0, 0),
-            ClusterInfo::handle_pull_response(&cluster_info, &entrypoint_pubkey2, data, &timeouts)
+            cluster_info.handle_pull_response(data, &timeouts)
         );
     }
 
@@ -3981,12 +3921,7 @@ mod tests {
             &stakes,
             Duration::from_millis(cluster_info.gossip.pull.crds_timeout),
         );
-        ClusterInfo::handle_pull_response(
-            &cluster_info,
-            &entrypoint_pubkey,
-            vec![entrypoint_crdsvalue],
-            &timeouts,
-        );
+        cluster_info.handle_pull_response(vec![entrypoint_crdsvalue], &timeouts);
         let (pings, pulls) = cluster_info.new_pull_requests(&thread_pool, None, &HashMap::new());
         assert_eq!(pings.len(), 1);
         assert_eq!(pulls.len(), MIN_NUM_BLOOM_FILTERS);
@@ -4495,7 +4430,7 @@ mod tests {
         );
         assert_eq!(
             (0, 0, NO_ENTRIES),
-            cluster_info.handle_pull_response(&entrypoint_pubkey, data, &timeouts)
+            cluster_info.handle_pull_response(data, &timeouts)
         );
     }