Merge pull request #189 from blockworks-foundation/use_counting_semaphore_to_poll_blocks

Use counting semaphore to poll blocks

cluster-endpoints/src/rpc_polling/poll_blocks.rs

@@ -18,7 +18,10 @@ use solana_transaction_status::{
     option_serializer::OptionSerializer, RewardType, TransactionDetails, UiTransactionEncoding,
     UiTransactionStatusMeta,
 };
-use std::{sync::Arc, time::Duration};
+use std::{
+    sync::{atomic::AtomicU64, Arc},
+    time::Duration,
+};
 use tokio::sync::broadcast::{Receiver, Sender};
 
 pub async fn process_block(
@@ -169,37 +172,51 @@ pub fn poll_block(
     let task_spawner: AnyhowJoinHandle = tokio::spawn(async move {
         let counting_semaphore = Arc::new(tokio::sync::Semaphore::new(1024));
         let mut slot_notification = slot_notification;
-        let mut last_processed_slot = 0;
+        let current_slot = Arc::new(AtomicU64::new(0));
         loop {
             let SlotNotification { processed_slot, .. } = slot_notification
                 .recv()
                 .await
                 .context("Slot notification channel close")?;
+            let last_processed_slot = current_slot.load(std::sync::atomic::Ordering::Relaxed);
             if processed_slot > last_processed_slot {
-                last_processed_slot = processed_slot;
+                current_slot.store(processed_slot, std::sync::atomic::Ordering::Relaxed);
+
+                for slot in last_processed_slot + 1..processed_slot + 1 {
                     let premit = counting_semaphore.clone().acquire_owned().await?;
                     let rpc_client = rpc_client.clone();
                     let block_notification_sender = block_notification_sender.clone();
+                    let current_slot = current_slot.clone();
                     tokio::spawn(async move {
-                    // try 500 times because slot gets
+                        let mut confirmed_slot_fetch = false;
-                    for _ in 0..1024 {
+                        while current_slot
+                            .load(std::sync::atomic::Ordering::Relaxed)
+                            .saturating_sub(slot)
+                            < 32
+                        {
                             if let Some(processed_block) = process_block(
                                 rpc_client.as_ref(),
-                            processed_slot,
+                                slot,
                                 CommitmentConfig::confirmed(),
                             )
                             .await
                             {
                                 let _ = block_notification_sender.send(processed_block);
+                                confirmed_slot_fetch = true;
                                 break;
                             }
                             tokio::time::sleep(Duration::from_millis(50)).await;
                         }
 
-                    for _ in 0..1024 {
+                        while confirmed_slot_fetch
+                            && current_slot
+                                .load(std::sync::atomic::Ordering::Relaxed)
+                                .saturating_sub(slot)
+                                < 128
+                        {
                             if let Some(processed_block) = process_block(
                                 rpc_client.as_ref(),
-                            processed_slot,
+                                slot,
                                 CommitmentConfig::finalized(),
                             )
                             .await
@@ -213,6 +230,7 @@ pub fn poll_block(
                     });
                 }
             }
+        }
     });
 
     vec![task_spawner]

lite-rpc/src/lib.rs

@@ -23,7 +23,7 @@ pub const DEFAULT_MAX_NUMBER_OF_TXS_IN_QUEUE: usize = 200_000;
 
 /// 25 slots in 10s send to little more leaders
 #[from_env]
-pub const DEFAULT_FANOUT_SIZE: u64 = 32;
+pub const DEFAULT_FANOUT_SIZE: u64 = 10;
 
 #[from_env]
 pub const MAX_RETRIES: usize = 40;

lite-rpc/src/main.rs

@@ -151,10 +151,10 @@ pub async fn start_lite_rpc(args: Args, rpc_client: Arc<RpcClient>) -> anyhow::R
             connection_timeout: Duration::from_secs(1),
             connection_retry_count: 10,
             finalize_timeout: Duration::from_millis(200),
-            max_number_of_connections: 10,
+            max_number_of_connections: 8,
             unistream_timeout: Duration::from_millis(500),
             write_timeout: Duration::from_secs(1),
-            number_of_transactions_per_unistream: 8,
+            number_of_transactions_per_unistream: 1,
         },
         tpu_connection_path,
     };

services/src/tpu_utils/tpu_connection_manager.rs

@@ -68,16 +68,17 @@ impl ActiveConnection {
         let mut exit_oneshot_channel = exit_oneshot_channel;
         let identity = self.identity;
 
-        let max_uni_stream_connections: u64 = compute_max_allowed_uni_streams(
-            identity_stakes.peer_type,
-            identity_stakes.stakes,
-            identity_stakes.total_stakes,
-        ) as u64;
         let number_of_transactions_per_unistream = self
             .connection_parameters
             .number_of_transactions_per_unistream;
         let max_number_of_connections = self.connection_parameters.max_number_of_connections;
 
+        let max_uni_stream_connections: u64 = (compute_max_allowed_uni_streams(
+            identity_stakes.peer_type,
+            identity_stakes.stakes,
+            identity_stakes.total_stakes,
+        ) * max_number_of_connections) as u64;
+
         let task_counter: Arc<AtomicU64> = Arc::new(AtomicU64::new(0));
         let exit_signal = self.exit_signal.clone();
         let connection_pool = QuicConnectionPool::new(

services/src/tpu_utils/tpu_service.rs

@@ -102,14 +102,6 @@ impl TpuService {
         current_slot: Slot,
         estimated_slot: Slot,
     ) -> anyhow::Result<()> {
-        let load_slot = if estimated_slot <= current_slot {
-            current_slot
-        } else if estimated_slot.saturating_sub(current_slot) > 8 {
-            estimated_slot - 8
-        } else {
-            current_slot
-        };
-
         let fanout = self.config.fanout_slots;
         let last_slot = estimated_slot + fanout;
 
@@ -117,7 +109,7 @@ impl TpuService {
 
         let next_leaders = self
             .leader_schedule
-            .get_slot_leaders(load_slot, last_slot)
+            .get_slot_leaders(current_slot, last_slot)
             .await?;
         // get next leader with its tpu port
         let connections_to_keep = next_leaders