701 lines
23 KiB
Rust
701 lines
23 KiB
Rust
//! The `retransmit_stage` retransmits shreds between validators
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#![allow(clippy::rc_buffer)]
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use {
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crate::{
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cluster_nodes::{ClusterNodes, ClusterNodesCache},
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packet_hasher::PacketHasher,
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},
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crossbeam_channel::{Receiver, RecvTimeoutError},
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itertools::{izip, Itertools},
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lru::LruCache,
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rayon::{prelude::*, ThreadPool, ThreadPoolBuilder},
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solana_client::rpc_response::SlotUpdate,
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solana_gossip::{
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cluster_info::{ClusterInfo, DATA_PLANE_FANOUT},
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contact_info::ContactInfo,
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},
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solana_ledger::{
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leader_schedule_cache::LeaderScheduleCache,
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shred::{self, ShredId},
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},
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solana_measure::measure::Measure,
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solana_rayon_threadlimit::get_thread_count,
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solana_rpc::{max_slots::MaxSlots, rpc_subscriptions::RpcSubscriptions},
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solana_runtime::{bank::Bank, bank_forks::BankForks},
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solana_sdk::{clock::Slot, pubkey::Pubkey, timing::timestamp},
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solana_streamer::{
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sendmmsg::{multi_target_send, SendPktsError},
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socket::SocketAddrSpace,
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},
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std::{
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collections::HashMap,
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iter::repeat,
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net::UdpSocket,
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ops::AddAssign,
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sync::{
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atomic::{AtomicU64, AtomicUsize, Ordering},
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Arc, RwLock,
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},
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thread::{self, Builder, JoinHandle},
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time::{Duration, Instant},
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},
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};
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const MAX_DUPLICATE_COUNT: usize = 2;
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const DEFAULT_LRU_SIZE: usize = 10_000;
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// Minimum number of shreds to use rayon parallel iterators.
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const PAR_ITER_MIN_NUM_SHREDS: usize = 2;
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const CLUSTER_NODES_CACHE_NUM_EPOCH_CAP: usize = 8;
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const CLUSTER_NODES_CACHE_TTL: Duration = Duration::from_secs(5);
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#[derive(Default)]
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struct RetransmitSlotStats {
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asof: u64, // Latest timestamp struct was updated.
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outset: u64, // 1st shred retransmit timestamp.
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// Number of shreds sent and received at different
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// distances from the turbine broadcast root.
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num_shreds_received: [usize; 3],
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num_shreds_sent: [usize; 3],
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}
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struct RetransmitStats {
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since: Instant,
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num_nodes: AtomicUsize,
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num_addrs_failed: AtomicUsize,
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num_shreds: usize,
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num_shreds_skipped: usize,
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num_small_batches: usize,
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total_batches: usize,
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total_time: u64,
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epoch_fetch: u64,
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epoch_cache_update: u64,
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retransmit_total: AtomicU64,
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compute_turbine_peers_total: AtomicU64,
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slot_stats: LruCache<Slot, RetransmitSlotStats>,
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unknown_shred_slot_leader: usize,
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}
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impl RetransmitStats {
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fn maybe_submit(
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&mut self,
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root_bank: &Bank,
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working_bank: &Bank,
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cluster_info: &ClusterInfo,
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cluster_nodes_cache: &ClusterNodesCache<RetransmitStage>,
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) {
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const SUBMIT_CADENCE: Duration = Duration::from_secs(2);
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if self.since.elapsed() < SUBMIT_CADENCE {
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return;
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}
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let num_peers = cluster_nodes_cache
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.get(root_bank.slot(), root_bank, working_bank, cluster_info)
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.num_peers();
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datapoint_info!("retransmit-num_nodes", ("count", num_peers, i64));
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datapoint_info!(
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"retransmit-stage",
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("total_time", self.total_time, i64),
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("epoch_fetch", self.epoch_fetch, i64),
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("epoch_cache_update", self.epoch_cache_update, i64),
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("total_batches", self.total_batches, i64),
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("num_small_batches", self.num_small_batches, i64),
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("num_nodes", *self.num_nodes.get_mut(), i64),
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("num_addrs_failed", *self.num_addrs_failed.get_mut(), i64),
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("num_shreds", self.num_shreds, i64),
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("num_shreds_skipped", self.num_shreds_skipped, i64),
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("retransmit_total", *self.retransmit_total.get_mut(), i64),
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(
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"compute_turbine",
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*self.compute_turbine_peers_total.get_mut(),
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i64
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),
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(
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"unknown_shred_slot_leader",
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self.unknown_shred_slot_leader,
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i64
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),
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);
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// slot_stats are submited at a different cadence.
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let old = std::mem::replace(self, Self::new(Instant::now()));
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self.slot_stats = old.slot_stats;
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}
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}
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// Map of shred (slot, index, type) => list of hash values seen for that key.
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type ShredFilter = LruCache<ShredId, Vec<u64>>;
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// Returns true if shred is already received and should skip retransmit.
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fn should_skip_retransmit(
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key: ShredId,
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shred: &[u8],
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shreds_received: &mut ShredFilter,
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packet_hasher: &PacketHasher,
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) -> bool {
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match shreds_received.get_mut(&key) {
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Some(sent) if sent.len() >= MAX_DUPLICATE_COUNT => true,
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Some(sent) => {
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let hash = packet_hasher.hash_shred(shred);
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if sent.contains(&hash) {
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true
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} else {
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sent.push(hash);
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false
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}
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}
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None => {
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let hash = packet_hasher.hash_shred(shred);
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shreds_received.put(key, vec![hash]);
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false
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}
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}
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}
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fn maybe_reset_shreds_received_cache(
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shreds_received: &mut ShredFilter,
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packet_hasher: &mut PacketHasher,
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hasher_reset_ts: &mut Instant,
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) {
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const UPDATE_INTERVAL: Duration = Duration::from_secs(1);
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if hasher_reset_ts.elapsed() >= UPDATE_INTERVAL {
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*hasher_reset_ts = Instant::now();
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shreds_received.clear();
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packet_hasher.reset();
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}
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}
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#[allow(clippy::too_many_arguments)]
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fn retransmit(
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thread_pool: &ThreadPool,
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bank_forks: &RwLock<BankForks>,
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leader_schedule_cache: &LeaderScheduleCache,
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cluster_info: &ClusterInfo,
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shreds_receiver: &Receiver<Vec</*shred:*/ Vec<u8>>>,
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sockets: &[UdpSocket],
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stats: &mut RetransmitStats,
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cluster_nodes_cache: &ClusterNodesCache<RetransmitStage>,
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hasher_reset_ts: &mut Instant,
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shreds_received: &mut ShredFilter,
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packet_hasher: &mut PacketHasher,
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max_slots: &MaxSlots,
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rpc_subscriptions: Option<&RpcSubscriptions>,
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) -> Result<(), RecvTimeoutError> {
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const RECV_TIMEOUT: Duration = Duration::from_secs(1);
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let mut shreds = shreds_receiver.recv_timeout(RECV_TIMEOUT)?;
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let mut timer_start = Measure::start("retransmit");
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shreds.extend(shreds_receiver.try_iter().flatten());
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stats.num_shreds += shreds.len();
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stats.total_batches += 1;
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let mut epoch_fetch = Measure::start("retransmit_epoch_fetch");
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let (working_bank, root_bank) = {
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let bank_forks = bank_forks.read().unwrap();
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(bank_forks.working_bank(), bank_forks.root_bank())
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};
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epoch_fetch.stop();
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stats.epoch_fetch += epoch_fetch.as_us();
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let mut epoch_cache_update = Measure::start("retransmit_epoch_cache_update");
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maybe_reset_shreds_received_cache(shreds_received, packet_hasher, hasher_reset_ts);
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epoch_cache_update.stop();
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stats.epoch_cache_update += epoch_cache_update.as_us();
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// Lookup slot leader and cluster nodes for each slot.
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let shreds: Vec<_> = shreds
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.into_iter()
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.filter_map(|shred| {
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let key = shred::layout::get_shred_id(&shred)?;
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if should_skip_retransmit(key, &shred, shreds_received, packet_hasher) {
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stats.num_shreds_skipped += 1;
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None
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} else {
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Some((key, shred))
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}
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})
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.into_group_map_by(|(key, _shred)| key.slot())
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.into_iter()
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.filter_map(|(slot, shreds)| {
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max_slots.retransmit.fetch_max(slot, Ordering::Relaxed);
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// TODO: consider using root-bank here for leader lookup!
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// Shreds' signatures should be verified before they reach here,
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// and if the leader is unknown they should fail signature check.
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// So here we should expect to know the slot leader and otherwise
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// skip the shred.
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let slot_leader = match leader_schedule_cache.slot_leader_at(slot, Some(&working_bank))
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{
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Some(pubkey) => pubkey,
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None => {
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stats.unknown_shred_slot_leader += shreds.len();
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return None;
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}
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};
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let cluster_nodes =
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cluster_nodes_cache.get(slot, &root_bank, &working_bank, cluster_info);
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Some(izip!(shreds, repeat(slot_leader), repeat(cluster_nodes)))
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})
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.flatten()
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.collect();
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let socket_addr_space = cluster_info.socket_addr_space();
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let record = |mut stats: HashMap<Slot, RetransmitSlotStats>,
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(slot, root_distance, num_nodes)| {
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let now = timestamp();
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let entry = stats.entry(slot).or_default();
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entry.record(now, root_distance, num_nodes);
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stats
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};
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let slot_stats = if shreds.len() < PAR_ITER_MIN_NUM_SHREDS {
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stats.num_small_batches += 1;
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shreds
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.into_iter()
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.enumerate()
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.map(|(index, ((key, shred), slot_leader, cluster_nodes))| {
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let (root_distance, num_nodes) = retransmit_shred(
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&key,
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&shred,
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&slot_leader,
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&root_bank,
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&cluster_nodes,
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socket_addr_space,
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&sockets[index % sockets.len()],
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stats,
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);
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(key.slot(), root_distance, num_nodes)
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})
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.fold(HashMap::new(), record)
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} else {
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thread_pool.install(|| {
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shreds
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.into_par_iter()
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.map(|((key, shred), slot_leader, cluster_nodes)| {
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let index = thread_pool.current_thread_index().unwrap();
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let (root_distance, num_nodes) = retransmit_shred(
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&key,
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&shred,
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&slot_leader,
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&root_bank,
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&cluster_nodes,
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socket_addr_space,
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&sockets[index % sockets.len()],
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stats,
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);
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(key.slot(), root_distance, num_nodes)
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})
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.fold(HashMap::new, record)
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.reduce(HashMap::new, RetransmitSlotStats::merge)
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})
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};
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stats.upsert_slot_stats(slot_stats, root_bank.slot(), rpc_subscriptions);
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timer_start.stop();
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stats.total_time += timer_start.as_us();
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stats.maybe_submit(&root_bank, &working_bank, cluster_info, cluster_nodes_cache);
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Ok(())
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}
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fn retransmit_shred(
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key: &ShredId,
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shred: &[u8],
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slot_leader: &Pubkey,
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root_bank: &Bank,
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cluster_nodes: &ClusterNodes<RetransmitStage>,
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socket_addr_space: &SocketAddrSpace,
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socket: &UdpSocket,
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stats: &RetransmitStats,
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) -> (/*root_distance:*/ usize, /*num_nodes:*/ usize) {
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let mut compute_turbine_peers = Measure::start("turbine_start");
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let (root_distance, addrs) =
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cluster_nodes.get_retransmit_addrs(slot_leader, key, root_bank, DATA_PLANE_FANOUT);
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let addrs: Vec<_> = addrs
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.into_iter()
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.filter(|addr| ContactInfo::is_valid_address(addr, socket_addr_space))
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.collect();
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compute_turbine_peers.stop();
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stats
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.compute_turbine_peers_total
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.fetch_add(compute_turbine_peers.as_us(), Ordering::Relaxed);
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let mut retransmit_time = Measure::start("retransmit_to");
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let num_nodes = match multi_target_send(socket, shred, &addrs) {
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Ok(()) => addrs.len(),
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Err(SendPktsError::IoError(ioerr, num_failed)) => {
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stats
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.num_addrs_failed
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.fetch_add(num_failed, Ordering::Relaxed);
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error!(
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"retransmit_to multi_target_send error: {:?}, {}/{} packets failed",
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ioerr,
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num_failed,
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addrs.len(),
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);
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addrs.len() - num_failed
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}
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};
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retransmit_time.stop();
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stats.num_nodes.fetch_add(num_nodes, Ordering::Relaxed);
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stats
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.retransmit_total
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.fetch_add(retransmit_time.as_us(), Ordering::Relaxed);
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(root_distance, num_nodes)
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}
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/// Service to retransmit messages from the leader or layer 1 to relevant peer nodes.
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/// See `cluster_info` for network layer definitions.
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/// # Arguments
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/// * `sockets` - Sockets to read from.
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/// * `bank_forks` - The BankForks structure
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/// * `leader_schedule_cache` - The leader schedule to verify shreds
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/// * `cluster_info` - This structure needs to be updated and populated by the bank and via gossip.
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/// * `r` - Receive channel for shreds to be retransmitted to all the layer 1 nodes.
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pub fn retransmitter(
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sockets: Arc<Vec<UdpSocket>>,
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bank_forks: Arc<RwLock<BankForks>>,
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leader_schedule_cache: Arc<LeaderScheduleCache>,
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cluster_info: Arc<ClusterInfo>,
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shreds_receiver: Receiver<Vec</*shred:*/ Vec<u8>>>,
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max_slots: Arc<MaxSlots>,
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rpc_subscriptions: Option<Arc<RpcSubscriptions>>,
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) -> JoinHandle<()> {
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let cluster_nodes_cache = ClusterNodesCache::<RetransmitStage>::new(
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CLUSTER_NODES_CACHE_NUM_EPOCH_CAP,
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CLUSTER_NODES_CACHE_TTL,
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);
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let mut hasher_reset_ts = Instant::now();
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let mut stats = RetransmitStats::new(Instant::now());
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let mut shreds_received = LruCache::<ShredId, _>::new(DEFAULT_LRU_SIZE);
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let mut packet_hasher = PacketHasher::default();
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let num_threads = get_thread_count().min(8).max(sockets.len());
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let thread_pool = ThreadPoolBuilder::new()
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.num_threads(num_threads)
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.thread_name(|i| format!("solRetransmit{:02}", i))
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.build()
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.unwrap();
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Builder::new()
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.name("solRetransmittr".to_string())
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.spawn(move || loop {
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match retransmit(
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&thread_pool,
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&bank_forks,
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&leader_schedule_cache,
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&cluster_info,
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&shreds_receiver,
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&sockets,
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&mut stats,
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&cluster_nodes_cache,
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&mut hasher_reset_ts,
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&mut shreds_received,
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&mut packet_hasher,
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&max_slots,
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rpc_subscriptions.as_deref(),
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) {
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Ok(()) => (),
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Err(RecvTimeoutError::Timeout) => (),
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Err(RecvTimeoutError::Disconnected) => break,
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}
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})
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.unwrap()
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}
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pub struct RetransmitStage {
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retransmit_thread_handle: JoinHandle<()>,
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}
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impl RetransmitStage {
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pub(crate) fn new(
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bank_forks: Arc<RwLock<BankForks>>,
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leader_schedule_cache: Arc<LeaderScheduleCache>,
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cluster_info: Arc<ClusterInfo>,
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retransmit_sockets: Arc<Vec<UdpSocket>>,
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retransmit_receiver: Receiver<Vec</*shred:*/ Vec<u8>>>,
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max_slots: Arc<MaxSlots>,
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rpc_subscriptions: Option<Arc<RpcSubscriptions>>,
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) -> Self {
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let retransmit_thread_handle = retransmitter(
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retransmit_sockets,
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bank_forks,
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leader_schedule_cache,
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cluster_info,
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retransmit_receiver,
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max_slots,
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rpc_subscriptions,
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);
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Self {
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retransmit_thread_handle,
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}
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}
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pub(crate) fn join(self) -> thread::Result<()> {
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self.retransmit_thread_handle.join()
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}
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}
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impl AddAssign for RetransmitSlotStats {
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fn add_assign(&mut self, other: Self) {
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let Self {
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asof,
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outset,
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num_shreds_received,
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num_shreds_sent,
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} = other;
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self.asof = self.asof.max(asof);
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self.outset = if self.outset == 0 {
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outset
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} else {
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self.outset.min(outset)
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};
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for k in 0..3 {
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self.num_shreds_received[k] += num_shreds_received[k];
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self.num_shreds_sent[k] += num_shreds_sent[k];
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}
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}
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}
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impl RetransmitStats {
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const SLOT_STATS_CACHE_CAPACITY: usize = 750;
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fn new(now: Instant) -> Self {
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Self {
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since: now,
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num_nodes: AtomicUsize::default(),
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num_addrs_failed: AtomicUsize::default(),
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num_shreds: 0usize,
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num_shreds_skipped: 0usize,
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total_batches: 0usize,
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num_small_batches: 0usize,
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total_time: 0u64,
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epoch_fetch: 0u64,
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epoch_cache_update: 0u64,
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retransmit_total: AtomicU64::default(),
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compute_turbine_peers_total: AtomicU64::default(),
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// Cache capacity is manually enforced.
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slot_stats: LruCache::<Slot, RetransmitSlotStats>::unbounded(),
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unknown_shred_slot_leader: 0usize,
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}
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}
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fn upsert_slot_stats<I>(
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&mut self,
|
|
feed: I,
|
|
root: Slot,
|
|
rpc_subscriptions: Option<&RpcSubscriptions>,
|
|
) where
|
|
I: IntoIterator<Item = (Slot, RetransmitSlotStats)>,
|
|
{
|
|
for (slot, slot_stats) in feed {
|
|
match self.slot_stats.get_mut(&slot) {
|
|
None => {
|
|
if let Some(rpc_subscriptions) = rpc_subscriptions {
|
|
if slot > root {
|
|
let slot_update = SlotUpdate::FirstShredReceived {
|
|
slot,
|
|
timestamp: slot_stats.outset,
|
|
};
|
|
rpc_subscriptions.notify_slot_update(slot_update);
|
|
datapoint_info!("retransmit-first-shred", ("slot", slot, i64));
|
|
}
|
|
}
|
|
self.slot_stats.put(slot, slot_stats);
|
|
}
|
|
Some(entry) => {
|
|
*entry += slot_stats;
|
|
}
|
|
}
|
|
}
|
|
while self.slot_stats.len() > Self::SLOT_STATS_CACHE_CAPACITY {
|
|
// Pop and submit metrics for the slot which was updated least
|
|
// recently. At this point the node most likely will not receive
|
|
// and retransmit any more shreds for this slot.
|
|
match self.slot_stats.pop_lru() {
|
|
Some((slot, stats)) => stats.submit(slot),
|
|
None => break,
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl RetransmitSlotStats {
|
|
fn record(&mut self, now: u64, root_distance: usize, num_nodes: usize) {
|
|
self.outset = if self.outset == 0 {
|
|
now
|
|
} else {
|
|
self.outset.min(now)
|
|
};
|
|
self.asof = self.asof.max(now);
|
|
self.num_shreds_received[root_distance] += 1;
|
|
self.num_shreds_sent[root_distance] += num_nodes;
|
|
}
|
|
|
|
fn merge(mut acc: HashMap<Slot, Self>, other: HashMap<Slot, Self>) -> HashMap<Slot, Self> {
|
|
if acc.len() < other.len() {
|
|
return Self::merge(other, acc);
|
|
}
|
|
for (key, value) in other {
|
|
*acc.entry(key).or_default() += value;
|
|
}
|
|
acc
|
|
}
|
|
|
|
fn submit(&self, slot: Slot) {
|
|
let num_shreds: usize = self.num_shreds_received.iter().sum();
|
|
let num_nodes: usize = self.num_shreds_sent.iter().sum();
|
|
let elapsed_millis = self.asof.saturating_sub(self.outset);
|
|
datapoint_info!(
|
|
"retransmit-stage-slot-stats",
|
|
("slot", slot, i64),
|
|
("outset_timestamp", self.outset, i64),
|
|
("elapsed_millis", elapsed_millis, i64),
|
|
("num_shreds", num_shreds, i64),
|
|
("num_nodes", num_nodes, i64),
|
|
("num_shreds_received_root", self.num_shreds_received[0], i64),
|
|
(
|
|
"num_shreds_received_1st_layer",
|
|
self.num_shreds_received[1],
|
|
i64
|
|
),
|
|
(
|
|
"num_shreds_received_2nd_layer",
|
|
self.num_shreds_received[2],
|
|
i64
|
|
),
|
|
("num_shreds_sent_root", self.num_shreds_sent[0], i64),
|
|
("num_shreds_sent_1st_layer", self.num_shreds_sent[1], i64),
|
|
("num_shreds_sent_2nd_layer", self.num_shreds_sent[2], i64),
|
|
);
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use {
|
|
super::*,
|
|
solana_ledger::shred::{Shred, ShredFlags},
|
|
};
|
|
|
|
#[test]
|
|
fn test_already_received() {
|
|
let slot = 1;
|
|
let index = 5;
|
|
let version = 0x40;
|
|
let shred = Shred::new_from_data(
|
|
slot,
|
|
index,
|
|
0,
|
|
&[],
|
|
ShredFlags::LAST_SHRED_IN_SLOT,
|
|
0,
|
|
version,
|
|
0,
|
|
);
|
|
let mut shreds_received = LruCache::new(100);
|
|
let packet_hasher = PacketHasher::default();
|
|
// unique shred for (1, 5) should pass
|
|
assert!(!should_skip_retransmit(
|
|
shred.id(),
|
|
shred.payload(),
|
|
&mut shreds_received,
|
|
&packet_hasher
|
|
));
|
|
// duplicate shred for (1, 5) blocked
|
|
assert!(should_skip_retransmit(
|
|
shred.id(),
|
|
shred.payload(),
|
|
&mut shreds_received,
|
|
&packet_hasher
|
|
));
|
|
|
|
let shred = Shred::new_from_data(
|
|
slot,
|
|
index,
|
|
2,
|
|
&[],
|
|
ShredFlags::LAST_SHRED_IN_SLOT,
|
|
0,
|
|
version,
|
|
0,
|
|
);
|
|
// first duplicate shred for (1, 5) passed
|
|
assert!(!should_skip_retransmit(
|
|
shred.id(),
|
|
shred.payload(),
|
|
&mut shreds_received,
|
|
&packet_hasher
|
|
));
|
|
// then blocked
|
|
assert!(should_skip_retransmit(
|
|
shred.id(),
|
|
shred.payload(),
|
|
&mut shreds_received,
|
|
&packet_hasher
|
|
));
|
|
|
|
let shred = Shred::new_from_data(
|
|
slot,
|
|
index,
|
|
8,
|
|
&[],
|
|
ShredFlags::LAST_SHRED_IN_SLOT,
|
|
0,
|
|
version,
|
|
0,
|
|
);
|
|
// 2nd duplicate shred for (1, 5) blocked
|
|
assert!(should_skip_retransmit(
|
|
shred.id(),
|
|
shred.payload(),
|
|
&mut shreds_received,
|
|
&packet_hasher
|
|
));
|
|
assert!(should_skip_retransmit(
|
|
shred.id(),
|
|
shred.payload(),
|
|
&mut shreds_received,
|
|
&packet_hasher
|
|
));
|
|
|
|
let shred = Shred::new_from_parity_shard(slot, index, &[], 0, 1, 1, 0, version);
|
|
// Coding at (1, 5) passes
|
|
assert!(!should_skip_retransmit(
|
|
shred.id(),
|
|
shred.payload(),
|
|
&mut shreds_received,
|
|
&packet_hasher
|
|
));
|
|
// then blocked
|
|
assert!(should_skip_retransmit(
|
|
shred.id(),
|
|
shred.payload(),
|
|
&mut shreds_received,
|
|
&packet_hasher
|
|
));
|
|
|
|
let shred = Shred::new_from_parity_shard(slot, index, &[], 2, 1, 1, 0, version);
|
|
// 2nd unique coding at (1, 5) passes
|
|
assert!(!should_skip_retransmit(
|
|
shred.id(),
|
|
shred.payload(),
|
|
&mut shreds_received,
|
|
&packet_hasher
|
|
));
|
|
// same again is blocked
|
|
assert!(should_skip_retransmit(
|
|
shred.id(),
|
|
shred.payload(),
|
|
&mut shreds_received,
|
|
&packet_hasher
|
|
));
|
|
|
|
let shred = Shred::new_from_parity_shard(slot, index, &[], 3, 1, 1, 0, version);
|
|
// Another unique coding at (1, 5) always blocked
|
|
assert!(should_skip_retransmit(
|
|
shred.id(),
|
|
shred.payload(),
|
|
&mut shreds_received,
|
|
&packet_hasher
|
|
));
|
|
assert!(should_skip_retransmit(
|
|
shred.id(),
|
|
shred.payload(),
|
|
&mut shreds_received,
|
|
&packet_hasher
|
|
));
|
|
}
|
|
}
|