v1.17: validator: ignore too old tower error (backport of #35229) (#35278)

validator: ignore too old tower error (#35229)

* validator: ignore too old tower error

* Update core/src/replay_stage.rs

Co-authored-by: Ashwin Sekar <ashwin@solana.com>

* remove redundant references

---------

Co-authored-by: Ashwin Sekar <ashwin@solana.com>
(cherry picked from commit 531793b)

Co-authored-by: DimAn <diman@diman.io>

Author: mergify[bot]

core/src/consensus.rs

@@ -1449,6 +1449,9 @@ impl TowerError {
             false
         }
     }
+    pub fn is_too_old(&self) -> bool {
+        matches!(self, TowerError::TooOldTower(_, _))
+    }
 }
 
 #[derive(Debug)]

core/src/replay_stage.rs

@@ -1136,6 +1136,13 @@ impl ReplayStage {
                         node_pubkey,
                         vote_account,
                     )
+                } else if err.is_too_old() {
+                    warn!("Failed to load tower, too old for {}: {}. Creating a new tower from bankforks.", node_pubkey, err);
+                    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);