649 lines
23 KiB
Rust
649 lines
23 KiB
Rust
//! The `bank_forks` module implements BankForks a DAG of checkpointed Banks
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use crate::{
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accounts_background_service::{AbsRequestSender, SnapshotRequest},
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bank::Bank,
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snapshot_config::SnapshotConfig,
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};
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use log::*;
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use solana_metrics::inc_new_counter_info;
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use solana_sdk::{clock::Slot, hash::Hash, timing};
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use std::{
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collections::{hash_map::Entry, HashMap, HashSet},
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ops::Index,
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sync::Arc,
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time::Instant,
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};
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pub struct BankForks {
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banks: HashMap<Slot, Arc<Bank>>,
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descendants: HashMap<Slot, HashSet<Slot>>,
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root: Slot,
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pub snapshot_config: Option<SnapshotConfig>,
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pub accounts_hash_interval_slots: Slot,
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last_accounts_hash_slot: Slot,
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}
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impl Index<u64> for BankForks {
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type Output = Arc<Bank>;
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fn index(&self, bank_slot: Slot) -> &Self::Output {
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&self.banks[&bank_slot]
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}
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}
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impl BankForks {
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pub fn new(bank: Bank) -> Self {
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let root = bank.slot();
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Self::new_from_banks(&[Arc::new(bank)], root)
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}
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pub fn banks(&self) -> &HashMap<Slot, Arc<Bank>> {
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&self.banks
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}
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/// Create a map of bank slot id to the set of ancestors for the bank slot.
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pub fn ancestors(&self) -> HashMap<Slot, HashSet<Slot>> {
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let root = self.root;
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self.banks
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.iter()
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.map(|(slot, bank)| {
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let ancestors = bank.proper_ancestors().filter(|k| *k >= root);
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(*slot, ancestors.collect())
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})
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.collect()
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}
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/// Create a map of bank slot id to the set of all of its descendants
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pub fn descendants(&self) -> &HashMap<Slot, HashSet<Slot>> {
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&self.descendants
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}
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pub fn frozen_banks(&self) -> HashMap<Slot, Arc<Bank>> {
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self.banks
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.iter()
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.filter(|(_, b)| b.is_frozen())
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.map(|(k, b)| (*k, b.clone()))
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.collect()
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}
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pub fn active_banks(&self) -> Vec<Slot> {
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self.banks
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.iter()
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.filter(|(_, v)| !v.is_frozen())
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.map(|(k, _v)| *k)
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.collect()
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}
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pub fn get(&self, bank_slot: Slot) -> Option<&Arc<Bank>> {
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self.banks.get(&bank_slot)
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}
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pub fn get_with_checked_hash(
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&self,
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(bank_slot, expected_hash): (Slot, Hash),
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) -> Option<&Arc<Bank>> {
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let maybe_bank = self.banks.get(&bank_slot);
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if let Some(bank) = maybe_bank {
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assert_eq!(bank.hash(), expected_hash);
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}
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maybe_bank
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}
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pub fn bank_hash(&self, slot: Slot) -> Option<Hash> {
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self.get(slot).map(|bank| bank.hash())
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}
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pub fn root_bank(&self) -> Arc<Bank> {
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self[self.root()].clone()
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}
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pub fn new_from_banks(initial_forks: &[Arc<Bank>], root: Slot) -> Self {
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let mut banks = HashMap::new();
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// Iterate through the heads of all the different forks
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for bank in initial_forks {
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banks.insert(bank.slot(), bank.clone());
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let parents = bank.parents();
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for parent in parents {
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if banks.contains_key(&parent.slot()) {
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// All ancestors have already been inserted by another fork
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break;
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}
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banks.insert(parent.slot(), parent.clone());
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}
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}
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let mut descendants = HashMap::<_, HashSet<_>>::new();
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for (slot, bank) in &banks {
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descendants.entry(*slot).or_default();
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for parent in bank.proper_ancestors() {
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descendants.entry(parent).or_default().insert(*slot);
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}
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}
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Self {
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root,
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banks,
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descendants,
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snapshot_config: None,
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accounts_hash_interval_slots: std::u64::MAX,
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last_accounts_hash_slot: root,
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}
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}
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pub fn insert(&mut self, bank: Bank) -> Arc<Bank> {
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let bank = Arc::new(bank);
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let prev = self.banks.insert(bank.slot(), bank.clone());
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assert!(prev.is_none());
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let slot = bank.slot();
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self.descendants.entry(slot).or_default();
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for parent in bank.proper_ancestors() {
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self.descendants.entry(parent).or_default().insert(slot);
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}
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bank
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}
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pub fn remove(&mut self, slot: Slot) -> Option<Arc<Bank>> {
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let bank = self.banks.remove(&slot)?;
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for parent in bank.proper_ancestors() {
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let mut entry = match self.descendants.entry(parent) {
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Entry::Vacant(_) => panic!("this should not happen!"),
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Entry::Occupied(entry) => entry,
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};
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entry.get_mut().remove(&slot);
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if entry.get().is_empty() && !self.banks.contains_key(&parent) {
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entry.remove_entry();
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}
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}
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let entry = match self.descendants.entry(slot) {
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Entry::Vacant(_) => panic!("this should not happen!"),
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Entry::Occupied(entry) => entry,
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};
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if entry.get().is_empty() {
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entry.remove_entry();
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}
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Some(bank)
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}
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pub fn highest_slot(&self) -> Slot {
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self.banks.values().map(|bank| bank.slot()).max().unwrap()
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}
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pub fn working_bank(&self) -> Arc<Bank> {
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self[self.highest_slot()].clone()
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}
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pub fn set_root(
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&mut self,
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root: Slot,
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accounts_background_request_sender: &AbsRequestSender,
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highest_confirmed_root: Option<Slot>,
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) {
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let old_epoch = self.root_bank().epoch();
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self.root = root;
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let set_root_start = Instant::now();
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let root_bank = self
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.banks
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.get(&root)
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.expect("root bank didn't exist in bank_forks");
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let new_epoch = root_bank.epoch();
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if old_epoch != new_epoch {
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info!(
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"Root entering
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epoch: {},
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next_epoch_start_slot: {},
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epoch_stakes: {:#?}",
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new_epoch,
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root_bank
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.epoch_schedule()
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.get_first_slot_in_epoch(new_epoch + 1),
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root_bank
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.epoch_stakes(new_epoch)
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.unwrap()
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.node_id_to_vote_accounts()
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);
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}
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let root_tx_count = root_bank
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.parents()
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.last()
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.map(|bank| bank.transaction_count())
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.unwrap_or(0);
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// Calculate the accounts hash at a fixed interval
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let mut is_root_bank_squashed = false;
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let mut banks = vec![root_bank];
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let parents = root_bank.parents();
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banks.extend(parents.iter());
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for bank in banks.iter() {
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let bank_slot = bank.slot();
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if bank.block_height() % self.accounts_hash_interval_slots == 0
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&& bank_slot > self.last_accounts_hash_slot
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{
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self.last_accounts_hash_slot = bank_slot;
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bank.squash();
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is_root_bank_squashed = bank_slot == root;
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if self.snapshot_config.is_some()
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&& accounts_background_request_sender.is_snapshot_creation_enabled()
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{
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let snapshot_root_bank = self.root_bank();
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let root_slot = snapshot_root_bank.slot();
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if let Err(e) =
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accounts_background_request_sender.send_snapshot_request(SnapshotRequest {
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snapshot_root_bank,
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// Save off the status cache because these may get pruned
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// if another `set_root()` is called before the snapshots package
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// can be generated
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status_cache_slot_deltas: bank.src.slot_deltas(&bank.src.roots()),
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})
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{
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warn!(
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"Error sending snapshot request for bank: {}, err: {:?}",
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root_slot, e
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);
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}
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}
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break;
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}
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}
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if !is_root_bank_squashed {
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root_bank.squash();
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}
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let new_tx_count = root_bank.transaction_count();
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self.prune_non_rooted(root, highest_confirmed_root);
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inc_new_counter_info!(
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"bank-forks_set_root_ms",
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timing::duration_as_ms(&set_root_start.elapsed()) as usize
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);
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inc_new_counter_info!(
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"bank-forks_set_root_tx_count",
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(new_tx_count - root_tx_count) as usize
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);
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}
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pub fn root(&self) -> Slot {
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self.root
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}
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/// After setting a new root, prune the banks that are no longer on rooted paths
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///
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/// Given the following banks and slots...
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///
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/// ```text
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/// slot 6 * (G)
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/// /
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/// slot 5 (F) * /
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/// | /
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/// slot 4 (E) * | /
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/// | |/
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/// slot 3 | * (D) <-- root, from set_root()
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/// | |
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/// slot 2 (C) * |
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/// \ |
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/// slot 1 \ * (B)
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/// \ |
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/// slot 0 * (A) <-- highest confirmed root [1]
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/// ```
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///
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/// ...where (D) is set as root, clean up (C) and (E), since they are not rooted.
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///
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/// (A) is kept because it is greater-than-or-equal-to the highest confirmed root, and (D) is
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/// one of its descendants
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/// (B) is kept for the same reason as (A)
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/// (C) is pruned since it is a lower slot than (D), but (D) is _not_ one of its descendants
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/// (D) is kept since it is the root
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/// (E) is pruned since it is not a descendant of (D)
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/// (F) is kept since it is a descendant of (D)
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/// (G) is kept for the same reason as (F)
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///
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/// and in table form...
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///
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/// ```text
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/// | | is root a | is a descendant ||
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/// slot | is root? | descendant? | of root? || keep?
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/// ------+----------+-------------+-----------------++-------
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/// (A) | N | Y | N || Y
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/// (B) | N | Y | N || Y
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/// (C) | N | N | N || N
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/// (D) | Y | N | N || Y
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/// (E) | N | N | N || N
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/// (F) | N | N | Y || Y
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/// (G) | N | N | Y || Y
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/// ```
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///
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/// [1] RPC has the concept of commitment level, which is based on the highest confirmed root,
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/// i.e. the cluster-confirmed root. This commitment is stronger than the local node's root.
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/// So (A) and (B) are kept to facilitate RPC at different commitment levels. Everything below
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/// the highest confirmed root can be pruned.
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fn prune_non_rooted(&mut self, root: Slot, highest_confirmed_root: Option<Slot>) {
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let highest_confirmed_root = highest_confirmed_root.unwrap_or(root);
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let prune_slots: Vec<_> = self
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.banks
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.keys()
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.copied()
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.filter(|slot| {
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let keep = *slot == root
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|| self.descendants[&root].contains(slot)
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|| (*slot < root
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&& *slot >= highest_confirmed_root
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&& self.descendants[slot].contains(&root));
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!keep
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})
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.collect();
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for slot in prune_slots {
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self.remove(slot);
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}
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datapoint_debug!(
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"bank_forks_purge_non_root",
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("num_banks_retained", self.banks.len(), i64),
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);
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}
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pub fn set_snapshot_config(&mut self, snapshot_config: Option<SnapshotConfig>) {
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self.snapshot_config = snapshot_config;
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}
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pub fn snapshot_config(&self) -> &Option<SnapshotConfig> {
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&self.snapshot_config
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}
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pub fn set_accounts_hash_interval_slots(&mut self, accounts_interval_slots: u64) {
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self.accounts_hash_interval_slots = accounts_interval_slots;
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::{
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bank::tests::update_vote_account_timestamp,
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genesis_utils::{
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create_genesis_config, create_genesis_config_with_leader, GenesisConfigInfo,
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},
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};
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use solana_sdk::hash::Hash;
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use solana_sdk::{
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clock::UnixTimestamp,
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pubkey::Pubkey,
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signature::{Keypair, Signer},
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sysvar::epoch_schedule::EpochSchedule,
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};
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use solana_vote_program::vote_state::BlockTimestamp;
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#[test]
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fn test_bank_forks_new() {
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let GenesisConfigInfo { genesis_config, .. } = create_genesis_config(10_000);
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let bank = Bank::new_for_tests(&genesis_config);
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let mut bank_forks = BankForks::new(bank);
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let child_bank = Bank::new_from_parent(&bank_forks[0u64], &Pubkey::default(), 1);
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child_bank.register_tick(&Hash::default());
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bank_forks.insert(child_bank);
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assert_eq!(bank_forks[1u64].tick_height(), 1);
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assert_eq!(bank_forks.working_bank().tick_height(), 1);
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}
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#[test]
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fn test_bank_forks_new_from_banks() {
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let GenesisConfigInfo { genesis_config, .. } = create_genesis_config(10_000);
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let bank = Arc::new(Bank::new_for_tests(&genesis_config));
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let child_bank = Arc::new(Bank::new_from_parent(&bank, &Pubkey::default(), 1));
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let bank_forks = BankForks::new_from_banks(&[bank.clone(), child_bank.clone()], 0);
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assert_eq!(bank_forks.root(), 0);
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assert_eq!(bank_forks.working_bank().slot(), 1);
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let bank_forks = BankForks::new_from_banks(&[child_bank, bank], 0);
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assert_eq!(bank_forks.root(), 0);
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assert_eq!(bank_forks.working_bank().slot(), 1);
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}
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#[test]
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fn test_bank_forks_descendants() {
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let GenesisConfigInfo { genesis_config, .. } = create_genesis_config(10_000);
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let bank = Bank::new_for_tests(&genesis_config);
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let mut bank_forks = BankForks::new(bank);
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let bank0 = bank_forks[0].clone();
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let bank = Bank::new_from_parent(&bank0, &Pubkey::default(), 1);
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bank_forks.insert(bank);
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let bank = Bank::new_from_parent(&bank0, &Pubkey::default(), 2);
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bank_forks.insert(bank);
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let descendants = bank_forks.descendants();
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let children: HashSet<u64> = [1u64, 2u64].to_vec().into_iter().collect();
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assert_eq!(children, *descendants.get(&0).unwrap());
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assert!(descendants[&1].is_empty());
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assert!(descendants[&2].is_empty());
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}
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#[test]
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fn test_bank_forks_ancestors() {
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let GenesisConfigInfo { genesis_config, .. } = create_genesis_config(10_000);
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let bank = Bank::new_for_tests(&genesis_config);
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let mut bank_forks = BankForks::new(bank);
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let bank0 = bank_forks[0].clone();
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let bank = Bank::new_from_parent(&bank0, &Pubkey::default(), 1);
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bank_forks.insert(bank);
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let bank = Bank::new_from_parent(&bank0, &Pubkey::default(), 2);
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bank_forks.insert(bank);
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let ancestors = bank_forks.ancestors();
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assert!(ancestors[&0].is_empty());
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let parents: Vec<u64> = ancestors[&1].iter().cloned().collect();
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assert_eq!(parents, vec![0]);
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let parents: Vec<u64> = ancestors[&2].iter().cloned().collect();
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assert_eq!(parents, vec![0]);
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}
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#[test]
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fn test_bank_forks_frozen_banks() {
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let GenesisConfigInfo { genesis_config, .. } = create_genesis_config(10_000);
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let bank = Bank::new_for_tests(&genesis_config);
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let mut bank_forks = BankForks::new(bank);
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let child_bank = Bank::new_from_parent(&bank_forks[0u64], &Pubkey::default(), 1);
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bank_forks.insert(child_bank);
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assert!(bank_forks.frozen_banks().get(&0).is_some());
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assert!(bank_forks.frozen_banks().get(&1).is_none());
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}
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#[test]
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fn test_bank_forks_active_banks() {
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let GenesisConfigInfo { genesis_config, .. } = create_genesis_config(10_000);
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let bank = Bank::new_for_tests(&genesis_config);
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let mut bank_forks = BankForks::new(bank);
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let child_bank = Bank::new_from_parent(&bank_forks[0u64], &Pubkey::default(), 1);
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bank_forks.insert(child_bank);
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assert_eq!(bank_forks.active_banks(), vec![1]);
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}
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#[test]
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fn test_bank_forks_different_set_root() {
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solana_logger::setup();
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let leader_keypair = Keypair::new();
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let GenesisConfigInfo {
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mut genesis_config,
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mint_keypair: _,
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voting_keypair,
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} = create_genesis_config_with_leader(10_000, &leader_keypair.pubkey(), 1_000);
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let slots_in_epoch = 32;
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genesis_config.epoch_schedule = EpochSchedule::new(slots_in_epoch);
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let bank0 = Bank::new_for_tests(&genesis_config);
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let mut bank_forks0 = BankForks::new(bank0);
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bank_forks0.set_root(0, &AbsRequestSender::default(), None);
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let bank1 = Bank::new_for_tests(&genesis_config);
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let mut bank_forks1 = BankForks::new(bank1);
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let additional_timestamp_secs = 2;
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let num_slots = slots_in_epoch + 1; // Advance past first epoch boundary
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for slot in 1..num_slots {
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// Just after the epoch boundary, timestamp a vote that will shift
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// Clock::unix_timestamp from Bank::unix_timestamp_from_genesis()
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let update_timestamp_case = slot == slots_in_epoch;
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let child1 = Bank::new_from_parent(&bank_forks0[slot - 1], &Pubkey::default(), slot);
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let child2 = Bank::new_from_parent(&bank_forks1[slot - 1], &Pubkey::default(), slot);
|
|
|
|
if update_timestamp_case {
|
|
for child in &[&child1, &child2] {
|
|
let recent_timestamp: UnixTimestamp = child.unix_timestamp_from_genesis();
|
|
update_vote_account_timestamp(
|
|
BlockTimestamp {
|
|
slot: child.slot(),
|
|
timestamp: recent_timestamp + additional_timestamp_secs,
|
|
},
|
|
child,
|
|
&voting_keypair.pubkey(),
|
|
);
|
|
}
|
|
}
|
|
|
|
// Set root in bank_forks0 to truncate the ancestor history
|
|
bank_forks0.insert(child1);
|
|
bank_forks0.set_root(slot, &AbsRequestSender::default(), None);
|
|
|
|
// Don't set root in bank_forks1 to keep the ancestor history
|
|
bank_forks1.insert(child2);
|
|
}
|
|
let child1 = &bank_forks0.working_bank();
|
|
let child2 = &bank_forks1.working_bank();
|
|
|
|
child1.freeze();
|
|
child2.freeze();
|
|
|
|
info!("child0.ancestors: {:?}", child1.ancestors);
|
|
info!("child1.ancestors: {:?}", child2.ancestors);
|
|
assert_eq!(child1.hash(), child2.hash());
|
|
}
|
|
|
|
fn make_hash_map(data: Vec<(Slot, Vec<Slot>)>) -> HashMap<Slot, HashSet<Slot>> {
|
|
data.into_iter()
|
|
.map(|(k, v)| (k, v.into_iter().collect()))
|
|
.collect()
|
|
}
|
|
|
|
#[test]
|
|
fn test_bank_forks_with_set_root() {
|
|
let GenesisConfigInfo { genesis_config, .. } = create_genesis_config(10_000);
|
|
let mut banks = vec![Arc::new(Bank::new_for_tests(&genesis_config))];
|
|
assert_eq!(banks[0].slot(), 0);
|
|
let mut bank_forks = BankForks::new_from_banks(&banks, 0);
|
|
banks.push(bank_forks.insert(Bank::new_from_parent(&banks[0], &Pubkey::default(), 1)));
|
|
banks.push(bank_forks.insert(Bank::new_from_parent(&banks[1], &Pubkey::default(), 2)));
|
|
banks.push(bank_forks.insert(Bank::new_from_parent(&banks[0], &Pubkey::default(), 3)));
|
|
banks.push(bank_forks.insert(Bank::new_from_parent(&banks[3], &Pubkey::default(), 4)));
|
|
assert_eq!(
|
|
bank_forks.ancestors(),
|
|
make_hash_map(vec![
|
|
(0, vec![]),
|
|
(1, vec![0]),
|
|
(2, vec![0, 1]),
|
|
(3, vec![0]),
|
|
(4, vec![0, 3]),
|
|
])
|
|
);
|
|
assert_eq!(
|
|
*bank_forks.descendants(),
|
|
make_hash_map(vec![
|
|
(0, vec![1, 2, 3, 4]),
|
|
(1, vec![2]),
|
|
(2, vec![]),
|
|
(3, vec![4]),
|
|
(4, vec![]),
|
|
])
|
|
);
|
|
bank_forks.set_root(
|
|
2,
|
|
&AbsRequestSender::default(),
|
|
None, // highest confirmed root
|
|
);
|
|
banks[2].squash();
|
|
assert_eq!(bank_forks.ancestors(), make_hash_map(vec![(2, vec![]),]));
|
|
assert_eq!(
|
|
*bank_forks.descendants(),
|
|
make_hash_map(vec![(0, vec![2]), (1, vec![2]), (2, vec![]),])
|
|
);
|
|
banks.push(bank_forks.insert(Bank::new_from_parent(&banks[2], &Pubkey::default(), 5)));
|
|
banks.push(bank_forks.insert(Bank::new_from_parent(&banks[5], &Pubkey::default(), 6)));
|
|
assert_eq!(
|
|
bank_forks.ancestors(),
|
|
make_hash_map(vec![(2, vec![]), (5, vec![2]), (6, vec![2, 5])])
|
|
);
|
|
assert_eq!(
|
|
*bank_forks.descendants(),
|
|
make_hash_map(vec![
|
|
(0, vec![2]),
|
|
(1, vec![2]),
|
|
(2, vec![5, 6]),
|
|
(5, vec![6]),
|
|
(6, vec![])
|
|
])
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_bank_forks_with_highest_confirmed_root() {
|
|
let GenesisConfigInfo { genesis_config, .. } = create_genesis_config(10_000);
|
|
let mut banks = vec![Arc::new(Bank::new_for_tests(&genesis_config))];
|
|
assert_eq!(banks[0].slot(), 0);
|
|
let mut bank_forks = BankForks::new_from_banks(&banks, 0);
|
|
banks.push(bank_forks.insert(Bank::new_from_parent(&banks[0], &Pubkey::default(), 1)));
|
|
banks.push(bank_forks.insert(Bank::new_from_parent(&banks[1], &Pubkey::default(), 2)));
|
|
banks.push(bank_forks.insert(Bank::new_from_parent(&banks[0], &Pubkey::default(), 3)));
|
|
banks.push(bank_forks.insert(Bank::new_from_parent(&banks[3], &Pubkey::default(), 4)));
|
|
assert_eq!(
|
|
bank_forks.ancestors(),
|
|
make_hash_map(vec![
|
|
(0, vec![]),
|
|
(1, vec![0]),
|
|
(2, vec![0, 1]),
|
|
(3, vec![0]),
|
|
(4, vec![0, 3]),
|
|
])
|
|
);
|
|
assert_eq!(
|
|
*bank_forks.descendants(),
|
|
make_hash_map(vec![
|
|
(0, vec![1, 2, 3, 4]),
|
|
(1, vec![2]),
|
|
(2, vec![]),
|
|
(3, vec![4]),
|
|
(4, vec![]),
|
|
])
|
|
);
|
|
bank_forks.set_root(
|
|
2,
|
|
&AbsRequestSender::default(),
|
|
Some(1), // highest confirmed root
|
|
);
|
|
banks[2].squash();
|
|
assert_eq!(
|
|
bank_forks.ancestors(),
|
|
make_hash_map(vec![(1, vec![]), (2, vec![]),])
|
|
);
|
|
assert_eq!(
|
|
*bank_forks.descendants(),
|
|
make_hash_map(vec![(0, vec![1, 2]), (1, vec![2]), (2, vec![]),])
|
|
);
|
|
banks.push(bank_forks.insert(Bank::new_from_parent(&banks[2], &Pubkey::default(), 5)));
|
|
banks.push(bank_forks.insert(Bank::new_from_parent(&banks[5], &Pubkey::default(), 6)));
|
|
assert_eq!(
|
|
bank_forks.ancestors(),
|
|
make_hash_map(vec![
|
|
(1, vec![]),
|
|
(2, vec![]),
|
|
(5, vec![2]),
|
|
(6, vec![2, 5])
|
|
])
|
|
);
|
|
assert_eq!(
|
|
*bank_forks.descendants(),
|
|
make_hash_map(vec![
|
|
(0, vec![1, 2]),
|
|
(1, vec![2]),
|
|
(2, vec![5, 6]),
|
|
(5, vec![6]),
|
|
(6, vec![])
|
|
])
|
|
);
|
|
}
|
|
}
|