use highest staked node as bootstrap leader, remove bootstrap_leader from genesis_block (#4635)

* use highest staked node as bootstrap leader, remove bootstrap_leader from genesis_block

* clippy

* fixup

* fixup

core/src/locktower.rs

@@ -391,7 +391,7 @@ impl Locktower {
         let mut lockouts = VoteState::default();
         if let Some(iter) = bank.epoch_vote_accounts(current_epoch) {
             for (delegate_pubkey, (_, account)) in iter {
-                if *delegate_pubkey == bank.collector_id() {
+                if delegate_pubkey == bank.collector_id() {
                     let state = VoteState::deserialize(&account.data).expect("votes");
                     if lockouts.votes.len() < state.votes.len() {
                         lockouts = state;

core/src/replay_stage.rs

@@ -388,7 +388,7 @@ impl ReplayStage {
         for bank_slot in &active_banks {
             let bank = bank_forks.read().unwrap().get(*bank_slot).unwrap().clone();
             *ticks_per_slot = bank.ticks_per_slot();
-            if bank.collector_id() != *my_pubkey {
+            if bank.collector_id() != my_pubkey {
                 Self::replay_blocktree_into_bank(&bank, &blocktree, progress)?;
             }
             let max_tick_height = (*bank_slot + 1) * bank.ticks_per_slot() - 1;
@@ -567,7 +567,7 @@ impl ReplayStage {
     ) {
         bank.freeze();
         info!("bank frozen {}", bank.slot());
-        if let Err(e) = slot_full_sender.send((bank.slot(), bank.collector_id())) {
+        if let Err(e) = slot_full_sender.send((bank.slot(), *bank.collector_id())) {
             trace!("{} slot_full alert failed: {:?}", my_pubkey, e);
         }
     }

genesis/src/main.rs

@@ -247,7 +247,6 @@ fn main() -> Result<(), Box<dyn error::Error>> {
     );
 
     let mut genesis_block = GenesisBlock::new(
-        &bootstrap_leader_keypair.pubkey(),
         &[
             // the mint
             (
@@ -366,7 +365,7 @@ mod tests {
 
     #[test]
     fn test_append_primordial_accounts_to_genesis() {
-        let mut genesis_block = GenesisBlock::new(&Pubkey::new_rand(), &[], &[]);
+        let mut genesis_block = GenesisBlock::new(&[], &[]);
 
         // Test invalid file returns error
         assert!(append_primordial_accounts("unknownfile", &mut genesis_block).is_err());

runtime/src/bank.rs

@@ -345,8 +345,8 @@ impl Bank {
         bank
     }
 
-    pub fn collector_id(&self) -> Pubkey {
-        self.collector_id
+    pub fn collector_id(&self) -> &Pubkey {
+        &self.collector_id
     }
 
     pub fn slot(&self) -> u64 {
@@ -473,13 +473,19 @@ impl Bank {
 
     fn process_genesis_block(&mut self, genesis_block: &GenesisBlock) {
         // Bootstrap leader collects fees until `new_from_parent` is called.
-        self.collector_id = genesis_block.bootstrap_leader_pubkey;
         self.fee_calculator = genesis_block.fee_calculator.clone();
         self.update_fees();
 
         for (pubkey, account) in genesis_block.accounts.iter() {
             self.store(pubkey, account);
         }
+        // highest staked node is the first collector
+        self.collector_id = self
+            .stakes
+            .read()
+            .unwrap()
+            .highest_staked_node()
+            .unwrap_or_default();
 
         self.blockhash_queue
             .write()

runtime/src/genesis_utils.rs

@@ -39,7 +39,6 @@ pub fn create_genesis_block_with_leader(
     );
 
     let genesis_block = GenesisBlock::new(
-        &bootstrap_leader_pubkey,
         &[
             // the mint
             (

runtime/src/stakes.rs

@@ -3,6 +3,7 @@
 use solana_sdk::account::Account;
 use solana_sdk::pubkey::Pubkey;
 use solana_stake_api::stake_state::StakeState;
+use solana_vote_api::vote_state::VoteState;
 use std::collections::HashMap;
 
 #[derive(Default, Clone, PartialEq, Debug, Deserialize, Serialize)]
@@ -84,6 +85,14 @@ impl Stakes {
     pub fn vote_accounts(&self) -> &HashMap<Pubkey, (u64, Account)> {
         &self.vote_accounts
     }
+
+    pub fn highest_staked_node(&self) -> Option<Pubkey> {
+        self.vote_accounts
+            .iter()
+            .max_by(|(_ak, av), (_bk, bv)| av.0.cmp(&bv.0))
+            .and_then(|(_k, (_stake, account))| VoteState::from(account))
+            .map(|vote_state| vote_state.node_pubkey)
+    }
 }
 
 #[cfg(test)]
@@ -153,6 +162,29 @@ mod tests {
         }
     }
 
+    #[test]
+    fn test_stakes_highest() {
+        let mut stakes = Stakes::default();
+
+        assert_eq!(stakes.highest_staked_node(), None);
+
+        let ((vote_pubkey, vote_account), (stake_pubkey, stake_account)) =
+            create_staked_node_accounts(10);
+
+        stakes.store(&vote_pubkey, &vote_account);
+        stakes.store(&stake_pubkey, &stake_account);
+
+        let ((vote11_pubkey, vote11_account), (stake11_pubkey, stake11_account)) =
+            create_staked_node_accounts(11);
+
+        stakes.store(&vote11_pubkey, &vote11_account);
+        stakes.store(&stake11_pubkey, &stake11_account);
+
+        let vote11_node_pubkey = VoteState::from(&vote11_account).unwrap().node_pubkey;
+
+        assert_eq!(stakes.highest_staked_node(), Some(vote11_node_pubkey))
+    }
+
     #[test]
     fn test_stakes_vote_account_disappear_reappear() {
         let mut stakes = Stakes::default();

sdk/src/genesis_block.rs

@@ -15,7 +15,6 @@ use std::path::Path;
 #[derive(Serialize, Deserialize, Debug)]
 pub struct GenesisBlock {
     pub accounts: Vec<(Pubkey, Account)>,
-    pub bootstrap_leader_pubkey: Pubkey,
     pub epoch_warmup: bool,
     pub fee_calculator: FeeCalculator,
     pub native_instruction_processors: Vec<(String, Pubkey)>,
@@ -30,7 +29,6 @@ pub fn create_genesis_block(lamports: u64) -> (GenesisBlock, Keypair) {
     let mint_keypair = Keypair::new();
     (
         GenesisBlock::new(
-            &Pubkey::default(),
             &[(
                 mint_keypair.pubkey(),
                 Account::new(lamports, 0, &system_program::id()),
@@ -43,13 +41,11 @@ pub fn create_genesis_block(lamports: u64) -> (GenesisBlock, Keypair) {
 
 impl GenesisBlock {
     pub fn new(
-        bootstrap_leader_pubkey: &Pubkey,
         accounts: &[(Pubkey, Account)],
         native_instruction_processors: &[(String, Pubkey)],
     ) -> Self {
         Self {
             accounts: accounts.to_vec(),
-            bootstrap_leader_pubkey: *bootstrap_leader_pubkey, // TODO: leader_schedule to derive from actual stakes, instead ;)
             epoch_warmup: true,
             fee_calculator: FeeCalculator::default(),
             native_instruction_processors: native_instruction_processors.to_vec(),
@@ -105,7 +101,6 @@ mod tests {
     fn test_genesis_block() {
         let mint_keypair = Keypair::new();
         let block = GenesisBlock::new(
-            &Pubkey::default(),
             &[
                 (
                     mint_keypair.pubkey(),