v1.17: replay: reload tower if set-identity during startup (backport …

…of #35173) (#35256)

replay: reload tower if set-identity during startup (#35173)

* replay: reload tower if set-identity during startup

* pr feedback: add unit tests

* pr feedback: use tower.node_pubkey, more descriptive names

(cherry picked from commit befe8b9)

Co-authored-by: Ashwin Sekar <[email protected]>

core/src/consensus.rs

@@ -279,6 +279,28 @@ impl Tower {
         }
     }
 
+    #[cfg(test)]
+    pub fn new_random(node_pubkey: Pubkey) -> Self {
+        use rand::Rng;
+
+        let mut rng = rand::thread_rng();
+        let root_slot = rng.gen();
+        let vote_state = VoteState::new_rand_for_tests(node_pubkey, root_slot);
+        let last_vote = VoteStateUpdate::from(
+            vote_state
+                .votes
+                .iter()
+                .map(|lv| (lv.slot(), lv.confirmation_count()))
+                .collect::<Vec<_>>(),
+        );
+        Self {
+            node_pubkey,
+            vote_state,
+            last_vote: VoteTransaction::CompactVoteStateUpdate(last_vote),
+            ..Tower::default()
+        }
+    }
+
     pub fn new_from_bankforks(
         bank_forks: &BankForks,
         node_pubkey: &Pubkey,

core/src/replay_stage.rs

@@ -545,6 +545,21 @@ impl ReplayStage {
             let _exit = Finalizer::new(exit.clone());
             let mut identity_keypair = cluster_info.keypair().clone();
             let mut my_pubkey = identity_keypair.pubkey();
+            if my_pubkey != tower.node_pubkey {
+                // set-identity was called during the startup procedure, ensure the tower is consistent
+                // before starting the loop. further calls to set-identity will reload the tower in the loop
+                let my_old_pubkey = tower.node_pubkey;
+                tower = Self::load_tower(
+                    tower_storage.as_ref(),
+                    &my_pubkey,
+                    &vote_account,
+                    &bank_forks,
+                );
+                warn!(
+                    "Identity changed during startup from {} to {}",
+                    my_old_pubkey, my_pubkey
+                );
+            }
             let (mut progress, mut heaviest_subtree_fork_choice) =
                 Self::initialize_progress_and_fork_choice_with_locked_bank_forks(
                     &bank_forks,
@@ -947,28 +962,12 @@ impl ReplayStage {
                             my_pubkey = identity_keypair.pubkey();
 
                             // Load the new identity's tower
-                            tower = Tower::restore(tower_storage.as_ref(), &my_pubkey)
-                                .and_then(|restored_tower| {
-                                    let root_bank = bank_forks.read().unwrap().root_bank();
-                                    let slot_history = root_bank.get_slot_history();
-                                    restored_tower.adjust_lockouts_after_replay(
-                                        root_bank.slot(),
-                                        &slot_history,
-                                    )
-                                })
-                                .unwrap_or_else(|err| {
-                                    if err.is_file_missing() {
-                                        Tower::new_from_bankforks(
-                                            &bank_forks.read().unwrap(),
-                                            &my_pubkey,
-                                            &vote_account,
-                                        )
-                                    } else {
-                                        error!("Failed to load tower for {}: {}", my_pubkey, err);
-                                        std::process::exit(1);
-                                    }
-                                });
-
+                            tower = Self::load_tower(
+                                tower_storage.as_ref(),
+                                &my_pubkey,
+                                &vote_account,
+                                &bank_forks,
+                            );
                             // Ensure the validator can land votes with the new identity before
                             // becoming leader
                             has_new_vote_been_rooted = !wait_for_vote_to_start_leader;
@@ -1118,6 +1117,32 @@ impl ReplayStage {
         })
     }
 
+    fn load_tower(
+        tower_storage: &dyn TowerStorage,
+        node_pubkey: &Pubkey,
+        vote_account: &Pubkey,
+        bank_forks: &Arc<RwLock<BankForks>>,
+    ) -> Tower {
+        Tower::restore(tower_storage, node_pubkey)
+            .and_then(|restored_tower| {
+                let root_bank = bank_forks.read().unwrap().root_bank();
+                let slot_history = root_bank.get_slot_history();
+                restored_tower.adjust_lockouts_after_replay(root_bank.slot(), &slot_history)
+            })
+            .unwrap_or_else(|err| {
+                if err.is_file_missing() {
+                    Tower::new_from_bankforks(
+                        &bank_forks.read().unwrap(),
+                        node_pubkey,
+                        vote_account,
+                    )
+                } else {
+                    error!("Failed to load tower for {}: {}", node_pubkey, err);
+                    std::process::exit(1);
+                }
+            })
+    }
+
     fn check_for_vote_only_mode(
         heaviest_bank_slot: Slot,
         forks_root: Slot,
@@ -4086,9 +4111,9 @@ pub(crate) mod tests {
         crate::{
             consensus::{
                 progress_map::{ValidatorStakeInfo, RETRANSMIT_BASE_DELAY_MS},
-                tower_storage::NullTowerStorage,
+                tower_storage::{FileTowerStorage, NullTowerStorage},
                 tree_diff::TreeDiff,
-                Tower,
+                Tower, VOTE_THRESHOLD_DEPTH,
             },
             replay_stage::ReplayStage,
             vote_simulator::{self, VoteSimulator},
@@ -4110,7 +4135,7 @@ pub(crate) mod tests {
         },
         solana_runtime::{
             accounts_background_service::AbsRequestSender,
-            commitment::BlockCommitment,
+            commitment::{BlockCommitment, VOTE_THRESHOLD_SIZE},
             genesis_utils::{GenesisConfigInfo, ValidatorVoteKeypairs},
         },
         solana_sdk::{
@@ -4134,6 +4159,7 @@ pub(crate) mod tests {
             iter,
             sync::{atomic::AtomicU64, Arc, RwLock},
         },
+        tempfile::tempdir,
         trees::{tr, Tree},
     };
 
@@ -8327,4 +8353,54 @@ pub(crate) mod tests {
         assert_eq!(reset_fork, Some(4));
         assert_eq!(failures, vec![HeaviestForkFailures::LockedOut(4),]);
     }
+
+    #[test]
+    fn test_tower_load_missing() {
+        let tower_file = tempdir().unwrap().into_path();
+        let tower_storage = FileTowerStorage::new(tower_file);
+        let node_pubkey = Pubkey::new_unique();
+        let vote_account = Pubkey::new_unique();
+        let tree = tr(0) / (tr(1) / (tr(3) / (tr(4))) / (tr(2) / (tr(5) / (tr(6)))));
+        let generate_votes = |pubkeys: Vec<Pubkey>| {
+            pubkeys
+                .into_iter()
+                .zip(iter::once(vec![0, 1, 2, 5, 6]).chain(iter::repeat(vec![0, 1, 3, 4]).take(2)))
+                .collect()
+        };
+        let (vote_simulator, _blockstore) =
+            setup_forks_from_tree(tree, 3, Some(Box::new(generate_votes)));
+        let bank_forks = vote_simulator.bank_forks;
+
+        let tower =
+            ReplayStage::load_tower(&tower_storage, &node_pubkey, &vote_account, &bank_forks);
+        let expected_tower = Tower::new_for_tests(VOTE_THRESHOLD_DEPTH, VOTE_THRESHOLD_SIZE);
+        assert_eq!(tower.vote_state, expected_tower.vote_state);
+        assert_eq!(tower.node_pubkey, node_pubkey);
+    }
+
+    #[test]
+    fn test_tower_load() {
+        let tower_file = tempdir().unwrap().into_path();
+        let tower_storage = FileTowerStorage::new(tower_file);
+        let node_keypair = Keypair::new();
+        let node_pubkey = node_keypair.pubkey();
+        let vote_account = Pubkey::new_unique();
+        let tree = tr(0) / (tr(1) / (tr(3) / (tr(4))) / (tr(2) / (tr(5) / (tr(6)))));
+        let generate_votes = |pubkeys: Vec<Pubkey>| {
+            pubkeys
+                .into_iter()
+                .zip(iter::once(vec![0, 1, 2, 5, 6]).chain(iter::repeat(vec![0, 1, 3, 4]).take(2)))
+                .collect()
+        };
+        let (vote_simulator, _blockstore) =
+            setup_forks_from_tree(tree, 3, Some(Box::new(generate_votes)));
+        let bank_forks = vote_simulator.bank_forks;
+        let expected_tower = Tower::new_random(node_pubkey);
+        expected_tower.save(&tower_storage, &node_keypair).unwrap();
+
+        let tower =
+            ReplayStage::load_tower(&tower_storage, &node_pubkey, &vote_account, &bank_forks);
+        assert_eq!(tower.vote_state, expected_tower.vote_state);
+        assert_eq!(tower.node_pubkey, expected_tower.node_pubkey);
+    }
 }

sdk/program/src/vote/state/mod.rs

@@ -325,6 +325,24 @@ impl VoteState {
         }
     }
 
+    pub fn new_rand_for_tests(node_pubkey: Pubkey, root_slot: Slot) -> Self {
+        let votes = (1..32)
+            .map(|x| LandedVote {
+                latency: 0,
+                lockout: Lockout::new_with_confirmation_count(
+                    u64::from(x).saturating_add(root_slot),
+                    32_u32.saturating_sub(x),
+                ),
+            })
+            .collect();
+        Self {
+            node_pubkey,
+            root_slot: Some(root_slot),
+            votes,
+            ..VoteState::default()
+        }
+    }
+
     pub fn get_authorized_voter(&self, epoch: Epoch) -> Option<Pubkey> {
         self.authorized_voters.get_authorized_voter(epoch)
     }