Revert "Remove deprecated slow epoch boundary methods (backport #21568) (#21595)"

This reverts commit b6d040b0d7.

core/src/replay_stage.rs

@@ -132,6 +132,7 @@ pub struct ReplayStageConfig {
     pub cache_block_meta_sender: Option<CacheBlockMetaSender>,
     pub bank_notification_sender: Option<BankNotificationSender>,
     pub wait_for_vote_to_start_leader: bool,
+    pub disable_epoch_boundary_optimization: bool,
 }
 
 #[derive(Default)]
@@ -333,6 +334,7 @@ impl ReplayStage {
             cache_block_meta_sender,
             bank_notification_sender,
             wait_for_vote_to_start_leader,
+            disable_epoch_boundary_optimization,
         } = config;
 
         trace!("replay stage");
@@ -697,6 +699,7 @@ impl ReplayStage {
                             &retransmit_slots_sender,
                             &mut skipped_slots_info,
                             has_new_vote_been_rooted,
+                            disable_epoch_boundary_optimization,
                         );
 
                         let poh_bank = poh_recorder.lock().unwrap().bank();
@@ -1087,6 +1090,7 @@ impl ReplayStage {
         retransmit_slots_sender: &RetransmitSlotsSender,
         skipped_slots_info: &mut SkippedSlotsInfo,
         has_new_vote_been_rooted: bool,
+        disable_epoch_boundary_optimization: bool,
     ) {
         // all the individual calls to poh_recorder.lock() are designed to
         // increase granularity, decrease contention
@@ -1204,7 +1208,10 @@ impl ReplayStage {
                 root_slot,
                 my_pubkey,
                 rpc_subscriptions,
-                NewBankOptions { vote_only_bank },
+                NewBankOptions {
+                    vote_only_bank,
+                    disable_epoch_boundary_optimization,
+                },
             );
 
             let tpu_bank = bank_forks.write().unwrap().insert(tpu_bank);

core/src/tvu.rs

@@ -98,6 +98,7 @@ pub struct TvuConfig {
     pub rocksdb_max_compaction_jitter: Option<u64>,
     pub wait_for_vote_to_start_leader: bool,
     pub accounts_shrink_ratio: AccountShrinkThreshold,
+    pub disable_epoch_boundary_optimization: bool,
 }
 
 impl Tvu {
@@ -281,6 +282,7 @@ impl Tvu {
             cache_block_meta_sender,
             bank_notification_sender,
             wait_for_vote_to_start_leader: tvu_config.wait_for_vote_to_start_leader,
+            disable_epoch_boundary_optimization: tvu_config.disable_epoch_boundary_optimization,
         };
 
         let (voting_sender, voting_receiver) = channel();

core/src/validator.rs

@@ -154,6 +154,7 @@ pub struct ValidatorConfig {
     pub validator_exit: Arc<RwLock<Exit>>,
     pub no_wait_for_vote_to_start_leader: bool,
     pub accounts_shrink_ratio: AccountShrinkThreshold,
+    pub disable_epoch_boundary_optimization: bool,
 }
 
 impl Default for ValidatorConfig {
@@ -212,6 +213,7 @@ impl Default for ValidatorConfig {
             validator_exit: Arc::new(RwLock::new(Exit::default())),
             no_wait_for_vote_to_start_leader: true,
             accounts_shrink_ratio: AccountShrinkThreshold::default(),
+            disable_epoch_boundary_optimization: false,
         }
     }
 }
@@ -808,6 +810,7 @@ impl Validator {
                 rocksdb_max_compaction_jitter: config.rocksdb_compaction_interval,
                 wait_for_vote_to_start_leader,
                 accounts_shrink_ratio: config.accounts_shrink_ratio,
+                disable_epoch_boundary_optimization: config.disable_epoch_boundary_optimization,
             },
             &max_slots,
             &cost_model,