Do not purge bank snapshots in AccountsBackgroundService (#31647)

core/src/accounts_hash_verifier.rs

@@ -329,9 +329,18 @@ impl AccountsHashVerifier {
         //
         // If we are *not* generating snapshots, then purge old bank snapshots here.
         if !snapshot_config.should_generate_snapshots() {
-            snapshot_utils::purge_bank_snapshots_older_than_slot(
+            let (_, purge_bank_snapshots_time_us) =
+                measure_us!(snapshot_utils::purge_bank_snapshots_older_than_slot(
                     &snapshot_config.bank_snapshots_dir,
                     accounts_package.slot,
+                ));
+            datapoint_info!(
+                "accounts_hash_verifier",
+                (
+                    "purge_old_snapshots_time_us",
+                    purge_bank_snapshots_time_us,
+                    i64
+                ),
             );
         }
 

core/src/snapshot_packager_service.rs

@@ -75,7 +75,7 @@ impl SnapshotPackagerService {
                     info!("handling snapshot package: {snapshot_package:?}");
                     let enqueued_time = snapshot_package.enqueued.elapsed();
 
-                    let (_, handling_time_us) = measure_us!({
+                    let (purge_bank_snapshots_time_us, handling_time_us) = measure_us!({
                         // Archiving the snapshot package is not allowed to fail.
                         // AccountsBackgroundService calls `clean_accounts()` with a value for
                         // last_full_snapshot_slot that requires this archive call to succeed.
@@ -99,10 +99,10 @@ impl SnapshotPackagerService {
                         // all bank snapshots older than this slot.  We want to keep the bank
                         // snapshot *at this slot* so that it can be used during restarts, when
                         // booting from local state.
-                        snapshot_utils::purge_bank_snapshots_older_than_slot(
+                        measure_us!(snapshot_utils::purge_bank_snapshots_older_than_slot(
                             &snapshot_config.bank_snapshots_dir,
                             snapshot_package.slot(),
-                        );
+                        )).1
                     });
 
                     datapoint_info!(
@@ -119,6 +119,7 @@ impl SnapshotPackagerService {
                         ),
                         ("enqueued_time_us", enqueued_time.as_micros(), i64),
                         ("handling_time_us", handling_time_us, i64),
+                        ("purge_old_snapshots_time_us", purge_bank_snapshots_time_us, i64),
                     );
                 }
                 info!("SnapshotPackagerService has stopped");

runtime/src/accounts_background_service.rs

@@ -16,7 +16,6 @@ use {
     crossbeam_channel::{Receiver, SendError, Sender},
     log::*,
     rand::{thread_rng, Rng},
-    snapshot_utils::MAX_BANK_SNAPSHOTS_TO_RETAIN,
     solana_measure::measure::Measure,
     solana_sdk::clock::{BankId, Slot},
     stats::StatsManager,
@@ -389,14 +388,6 @@ impl SnapshotRequestHandler {
             snapshot_root_bank.hash(),
         );
 
-        // Cleanup outdated snapshots
-        let mut purge_old_snapshots_time = Measure::start("purge_old_snapshots_time");
-        snapshot_utils::purge_old_bank_snapshots(
-            &self.snapshot_config.bank_snapshots_dir,
-            MAX_BANK_SNAPSHOTS_TO_RETAIN,
-            None,
-        );
-        purge_old_snapshots_time.stop();
         total_time.stop();
 
         datapoint_info!(
@@ -409,11 +400,6 @@ impl SnapshotRequestHandler {
             ("shrink_time", shrink_time.as_us(), i64),
             ("clean_time", clean_time.as_us(), i64),
             ("snapshot_time", snapshot_time.as_us(), i64),
-            (
-                "purge_old_snapshots_time",
-                purge_old_snapshots_time.as_us(),
-                i64
-            ),
             ("total_us", total_time.as_us(), i64),
             ("non_snapshot_time_us", non_snapshot_time_us, i64),
         );