Made connection cache configurable. (solana-labs#23783)

Added command-line argument tpu-use-quic argument.
Changed connection cache to return different connections based on the config.

banks-server/src/banks_server.rs

@@ -24,7 +24,7 @@ use {
         transaction::{self, SanitizedTransaction, Transaction},
     },
     solana_send_transaction_service::{
-        send_transaction_service::{SendTransactionService, TransactionInfo},
+        send_transaction_service::{SendTransactionService, TransactionInfo, DEFAULT_TPU_USE_QUIC},
         tpu_info::NullTpuInfo,
     },
     std::{
@@ -399,6 +399,7 @@ pub async fn start_tcp_server(
                 receiver,
                 5_000,
                 0,
+                DEFAULT_TPU_USE_QUIC,
             );
 
             let server = BanksServer::new(

client/src/connection_cache.rs

@@ -1,5 +1,7 @@
 use {
-    crate::{tpu_connection::TpuConnection, udp_client::UdpTpuConnection},
+    crate::{
+        quic_client::QuicTpuConnection, tpu_connection::TpuConnection, udp_client::UdpTpuConnection,
+    },
     lazy_static::lazy_static,
     std::{
         collections::{hash_map::Entry, BTreeMap, HashMap},
@@ -23,6 +25,7 @@ struct ConnMap {
     // that seems non-"Rust-y" and low bang/buck. This is still pretty terrible though...
     last_used_times: BTreeMap<u64, SocketAddr>,
     ticks: u64,
+    use_quic: bool,
 }
 
 impl ConnMap {
@@ -31,21 +34,31 @@ impl ConnMap {
             map: HashMap::new(),
             last_used_times: BTreeMap::new(),
             ticks: 0,
+            use_quic: false,
         }
     }
+
+    pub fn set_use_quic(&mut self, use_quic: bool) {
+        self.use_quic = use_quic;
+    }
 }
 
 lazy_static! {
     static ref CONNECTION_MAP: Mutex<ConnMap> = Mutex::new(ConnMap::new());
 }
 
+pub fn set_use_quic(use_quic: bool) {
+    let mut map = (*CONNECTION_MAP).lock().unwrap();
+    map.set_use_quic(use_quic);
+}
+
 #[allow(dead_code)]
 // TODO: see https://github.com/solana-labs/solana/issues/23661
 // remove lazy_static and optimize and refactor this
 pub fn get_connection(addr: &SocketAddr) -> Arc<dyn TpuConnection + 'static + Sync + Send> {
     let mut map = (*CONNECTION_MAP).lock().unwrap();
     let ticks = map.ticks;
-
+    let use_quic = map.use_quic;
     let (conn, target_ticks) = match map.map.entry(*addr) {
         Entry::Occupied(mut entry) => {
             let mut pair = entry.get_mut();
@@ -57,12 +70,15 @@ pub fn get_connection(addr: &SocketAddr) -> Arc<dyn TpuConnection + 'static + Sy
             let send_socket = UdpSocket::bind("0.0.0.0:0").unwrap();
             // TODO: see https://github.com/solana-labs/solana/issues/23659
             // make it configurable (e.g. via the command line) whether to use UDP or Quic
-            let conn = Arc::new(UdpTpuConnection::new(send_socket, *addr));
+
+            let conn: Arc<dyn TpuConnection + 'static + Sync + Send> = if use_quic {
+                Arc::new(QuicTpuConnection::new(send_socket, *addr))
+            } else {
+                Arc::new(UdpTpuConnection::new(send_socket, *addr))
+            };
+
             entry.insert((conn.clone(), ticks));
-            (
-                conn as Arc<dyn TpuConnection + 'static + Sync + Send>,
-                ticks,
-            )
+            (conn, ticks)
         }
     };
 

rpc/src/rpc.rs

@@ -75,7 +75,7 @@ use {
         },
     },
     solana_send_transaction_service::{
-        send_transaction_service::{SendTransactionService, TransactionInfo},
+        send_transaction_service::{SendTransactionService, TransactionInfo, DEFAULT_TPU_USE_QUIC},
         tpu_info::NullTpuInfo,
     },
     solana_storage_bigtable::Error as StorageError,
@@ -323,6 +323,7 @@ impl JsonRpcRequestProcessor {
             receiver,
             1000,
             1,
+            DEFAULT_TPU_USE_QUIC,
         );
 
         Self {
@@ -6087,6 +6088,7 @@ pub mod tests {
             receiver,
             1000,
             1,
+            DEFAULT_TPU_USE_QUIC,
         );
 
         let mut bad_transaction = system_transaction::transfer(
@@ -6352,6 +6354,7 @@ pub mod tests {
             receiver,
             1000,
             1,
+            DEFAULT_TPU_USE_QUIC,
         );
         assert_eq!(
             request_processor.get_block_commitment(0),

send-transaction-service/src/send_transaction_service.rs

@@ -65,12 +65,15 @@ struct ProcessTransactionsResult {
     retained: u64,
 }
 
+pub const DEFAULT_TPU_USE_QUIC: bool = false;
+
 #[derive(Clone, Debug)]
 pub struct Config {
     pub retry_rate_ms: u64,
     pub leader_forward_count: u64,
     pub default_max_retries: Option<usize>,
     pub service_max_retries: usize,
+    pub use_quic: bool,
 }
 
 impl Default for Config {
@@ -80,6 +83,7 @@ impl Default for Config {
             leader_forward_count: DEFAULT_LEADER_FORWARD_COUNT,
             default_max_retries: None,
             service_max_retries: DEFAULT_SERVICE_MAX_RETRIES,
+            use_quic: DEFAULT_TPU_USE_QUIC,
         }
     }
 }
@@ -92,10 +96,12 @@ impl SendTransactionService {
         receiver: Receiver<TransactionInfo>,
         retry_rate_ms: u64,
         leader_forward_count: u64,
+        use_quic: bool,
     ) -> Self {
         let config = Config {
             retry_rate_ms,
             leader_forward_count,
+            use_quic,
             ..Config::default()
         };
         Self::new_with_config(tpu_address, bank_forks, leader_info, receiver, config)
@@ -352,6 +358,7 @@ mod test {
             receiver,
             1000,
             1,
+            DEFAULT_TPU_USE_QUIC,
         );
 
         drop(sender);

validator/src/main.rs

@@ -9,6 +9,7 @@ use {
     console::style,
     log::*,
     rand::{seq::SliceRandom, thread_rng},
+    send_transaction_service::DEFAULT_TPU_USE_QUIC,
     solana_clap_utils::{
         input_parsers::{keypair_of, keypairs_of, pubkey_of, value_of},
         input_validators::{
@@ -456,6 +457,7 @@ pub fn main() {
     let default_accounts_shrink_ratio = &DEFAULT_ACCOUNTS_SHRINK_RATIO.to_string();
     let default_rocksdb_fifo_shred_storage_size =
         &DEFAULT_ROCKS_FIFO_SHRED_STORAGE_SIZE_BYTES.to_string();
+    let default_tpu_use_quic = &DEFAULT_TPU_USE_QUIC.to_string();
 
     let matches = App::new(crate_name!()).about(crate_description!())
         .version(solana_version::version!())
@@ -1144,6 +1146,14 @@ pub fn main() {
                 .validator(is_parsable::<u64>)
                 .help("Milliseconds to wait in the TPU receiver for packet coalescing."),
         )
+        .arg(
+            Arg::with_name("tpu_use_quic")
+                .long("tpu-use-quic")
+                .takes_value(true)
+                .value_name("BOOLEAN")
+                .default_value(default_tpu_use_quic)
+                .help("When this is set to true, the system will use QUIC to send transactions."),
+        )
         .arg(
             Arg::with_name("rocksdb_max_compaction_jitter")
                 .long("rocksdb-max-compaction-jitter-slots")
@@ -2095,6 +2105,8 @@ pub fn main() {
     let restricted_repair_only_mode = matches.is_present("restricted_repair_only_mode");
     let accounts_shrink_optimize_total_space =
         value_t_or_exit!(matches, "accounts_shrink_optimize_total_space", bool);
+    let tpu_use_quic = value_t_or_exit!(matches, "tpu_use_quic", bool);
+
     let shrink_ratio = value_t_or_exit!(matches, "accounts_shrink_ratio", f64);
     if !(0.0..=1.0).contains(&shrink_ratio) {
         eprintln!(
@@ -2366,6 +2378,7 @@ pub fn main() {
                 "rpc_send_transaction_service_max_retries",
                 usize
             ),
+            use_quic: tpu_use_quic,
         },
         no_poh_speed_test: matches.is_present("no_poh_speed_test"),
         no_os_memory_stats_reporting: matches.is_present("no_os_memory_stats_reporting"),