v1.1: Eager rent collection (#10028)

* Introduce eager rent collection (#9527)

* Switch AccountsIndex.account_maps from HashMap to BTreeMap

* Introduce eager rent collection

* Start to add tests

* Avoid too short eager rent collection cycles

* Add more tests

* Add more tests...

* Refacotr!!!!!!

* Refactoring follow up

* More tiny cleanups

* Don't rewrite 0-lamport accounts to be deterministic

* Refactor a bit

* Do hard fork, restore tests, and perf. mitigation

* Fix build...

* Refactor and add switch over for testnet (TdS)

* Use to_be_bytes

* cleanup

* More tiny cleanup

* Rebase cleanup

* Set Bank::genesis_hash when resuming from snapshot

* Reorder fns and clean ups

* Better naming and commenting

* Yet more naming clarifications

* Make prefix width strictly uniform for 2-base partition_count

* Fix typo...

* Revert cluster-dependent gate

* kick ci?

* kick ci?

* kick ci?

(cherry picked from commit 1eb40c3)

# Conflicts:
#	core/tests/bank_forks.rs
#	ledger/src/bank_forks_utils.rs
#	ledger/src/snapshot_utils.rs
#	runtime/src/bank.rs

* Fix merge conflicts

* Add gating

* Add Danger comment...

* Delay activation epoch

* Add gating for stable as well

* fmt...

* fmt!!!!

core/tests/bank_forks.rs

@@ -19,6 +19,7 @@ mod tests {
     };
     use solana_sdk::{
         clock::Slot,
+        genesis_config::GenesisConfig,
         hash::hashv,
         pubkey::Pubkey,
         signature::{Keypair, Signer},
@@ -90,6 +91,7 @@ mod tests {
                 snapshot_package_output_path,
                 &(old_last_bank.slot(), old_last_bank.get_accounts_hash()),
             ),
+            &GenesisConfig::default(),
         )
         .unwrap();
 

ledger/src/bank_forks_utils.rs

@@ -69,6 +69,7 @@ pub fn load(
                     &process_options.frozen_accounts,
                     &snapshot_config.snapshot_path,
                     &archive_filename,
+                    genesis_config,
                 )
                 .expect("Load from snapshot failed");
 

ledger/src/snapshot_utils.rs

@@ -13,7 +13,7 @@ use solana_runtime::{
         MAX_SNAPSHOT_DATA_FILE_SIZE,
     },
 };
-use solana_sdk::{clock::Slot, hash::Hash, pubkey::Pubkey};
+use solana_sdk::{clock::Slot, genesis_config::GenesisConfig, hash::Hash, pubkey::Pubkey};
 use std::{
     cmp::Ordering,
     env,
@@ -439,6 +439,7 @@ pub fn bank_from_archive<P: AsRef<Path>>(
     frozen_account_pubkeys: &[Pubkey],
     snapshot_path: &PathBuf,
     snapshot_tar: P,
+    genesis_config: &GenesisConfig,
 ) -> Result<Bank> {
     // Untar the snapshot into a temp directory under `snapshot_config.snapshot_path()`
     let unpack_dir = tempfile::tempdir_in(snapshot_path)?;
@@ -458,6 +459,7 @@ pub fn bank_from_archive<P: AsRef<Path>>(
         frozen_account_pubkeys,
         &unpacked_snapshots_dir,
         unpacked_accounts_dir,
+        genesis_config,
     )?;
 
     if !bank.verify_snapshot_bank() {
@@ -584,6 +586,7 @@ fn rebuild_bank_from_snapshots<P>(
     frozen_account_pubkeys: &[Pubkey],
     unpacked_snapshots_dir: &PathBuf,
     append_vecs_path: P,
+    genesis_config: &GenesisConfig,
 ) -> Result<Bank>
 where
     P: AsRef<Path>,
@@ -612,6 +615,7 @@ where
                     )));
                 }
             };
+            bank.operating_mode = Some(genesis_config.operating_mode);
             info!("Rebuilding accounts...");
             let rc = bank::BankRc::from_stream(
                 account_paths,

runtime/src/accounts.rs

@@ -27,6 +27,7 @@ use solana_sdk::{
 use std::{
     collections::{HashMap, HashSet},
     io::{BufReader, Error as IOError, Read},
+    ops::RangeBounds,
     path::{Path, PathBuf},
     sync::{Arc, Mutex, RwLock},
 };
@@ -455,6 +456,21 @@ impl Accounts {
         }
     }
 
+    fn load_while_filtering<F: Fn(&Account) -> bool>(
+        collector: &mut Vec<(Pubkey, Account)>,
+        option: Option<(&Pubkey, Account, Slot)>,
+        filter: F,
+    ) {
+        if let Some(data) = option
+            // Don't ever load zero lamport accounts into runtime because
+            // the existence of zero-lamport accounts are never deterministic!!
+            .filter(|(_, account, _)| account.lamports > 0 && filter(account))
+            .map(|(pubkey, account, _slot)| (*pubkey, account))
+        {
+            collector.push(data)
+        }
+    }
+
     pub fn load_by_program(
         &self,
         ancestors: &Ancestors,
@@ -463,15 +479,23 @@ impl Accounts {
         self.accounts_db.scan_accounts(
             ancestors,
             |collector: &mut Vec<(Pubkey, Account)>, option| {
-                if let Some(data) = option
-                    .filter(|(_, account, _)| {
-                        (program_id.is_none() || Some(&account.owner) == program_id)
-                            && account.lamports != 0
-                    })
-                    .map(|(pubkey, account, _slot)| (*pubkey, account))
-                {
-                    collector.push(data)
-                }
+                Self::load_while_filtering(collector, option, |account| {
+                    program_id.is_none() || Some(&account.owner) == program_id
+                })
+            },
+        )
+    }
+
+    pub fn load_to_collect_rent_eagerly<R: RangeBounds<Pubkey>>(
+        &self,
+        ancestors: &Ancestors,
+        range: R,
+    ) -> Vec<(Pubkey, Account)> {
+        self.accounts_db.range_scan_accounts(
+            ancestors,
+            range,
+            |collector: &mut Vec<(Pubkey, Account)>, option| {
+                Self::load_while_filtering(collector, option, |_| true)
             },
         )
     }

runtime/src/accounts_db.rs

@@ -47,6 +47,7 @@ use std::{
     collections::{HashMap, HashSet},
     fmt,
     io::{BufReader, Cursor, Error as IOError, ErrorKind, Read, Result as IOResult},
+    ops::RangeBounds,
     path::{Path, PathBuf},
     sync::atomic::{AtomicBool, AtomicU64, AtomicUsize, Ordering},
     sync::{Arc, Mutex, RwLock},
@@ -173,6 +174,25 @@ impl<'a> Serialize for AccountStorageSerialize<'a> {
 
 #[derive(Clone, Default, Debug)]
 pub struct AccountStorage(pub HashMap<Slot, SlotStores>);
+
+impl AccountStorage {
+    fn scan_accounts(&self, account_info: &AccountInfo, slot: Slot) -> Option<(Account, Slot)> {
+        self.0
+            .get(&slot)
+            .and_then(|storage_map| storage_map.get(&account_info.store_id))
+            .and_then(|store| {
+                Some(
+                    store
+                        .accounts
+                        .get_account(account_info.offset)?
+                        .0
+                        .clone_account(),
+                )
+            })
+            .map(|account| (account, slot))
+    }
+}
+
 impl<'de> Deserialize<'de> for AccountStorage {
     fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
     where
@@ -1084,19 +1104,28 @@ impl AccountsDB {
             scan_func(
                 &mut collector,
                 storage
-                    .0
-                    .get(&slot)
-                    .and_then(|storage_map| storage_map.get(&account_info.store_id))
-                    .and_then(|store| {
-                        Some(
-                            store
-                                .accounts
-                                .get_account(account_info.offset)?
-                                .0
-                                .clone_account(),
-                        )
-                    })
-                    .map(|account| (pubkey, account, slot)),
+                    .scan_accounts(account_info, slot)
+                    .map(|(account, slot)| (pubkey, account, slot)),
+            )
+        });
+        collector
+    }
+
+    pub fn range_scan_accounts<F, A, R>(&self, ancestors: &Ancestors, range: R, scan_func: F) -> A
+    where
+        F: Fn(&mut A, Option<(&Pubkey, Account, Slot)>) -> (),
+        A: Default,
+        R: RangeBounds<Pubkey>,
+    {
+        let mut collector = A::default();
+        let accounts_index = self.accounts_index.read().unwrap();
+        let storage = self.storage.read().unwrap();
+        accounts_index.range_scan_accounts(ancestors, range, |pubkey, (account_info, slot)| {
+            scan_func(
+                &mut collector,
+                storage
+                    .scan_accounts(account_info, slot)
+                    .map(|(account, slot)| (pubkey, account, slot)),
             )
         });
         collector
@@ -1303,6 +1332,7 @@ impl AccountsDB {
 
     pub fn include_owner_in_hash(slot: Slot) -> bool {
         // Account hashing updated to include owner activates at this slot on the testnet
+        // DANGER: Remove this guard ABSOLUTELY before the mainnet-beta transitions to v1.1.
         slot >= 14_000_000
     }
 

runtime/src/accounts_index.rs

@@ -1,7 +1,8 @@
 use solana_sdk::{clock::Slot, pubkey::Pubkey};
 use std::sync::atomic::{AtomicU64, Ordering};
 use std::{
-    collections::{HashMap, HashSet},
+    collections::{BTreeMap, HashMap, HashSet},
+    ops::RangeBounds,
     sync::{RwLock, RwLockReadGuard},
 };
 
@@ -14,26 +15,43 @@ type AccountMapEntry<T> = (AtomicU64, RwLock<SlotList<T>>);
 
 #[derive(Debug, Default)]
 pub struct AccountsIndex<T> {
-    pub account_maps: HashMap<Pubkey, AccountMapEntry<T>>,
+    pub account_maps: BTreeMap<Pubkey, AccountMapEntry<T>>,
 
     pub roots: HashSet<Slot>,
     pub uncleaned_roots: HashSet<Slot>,
 }
 
-impl<T: Clone> AccountsIndex<T> {
-    /// call func with every pubkey and index visible from a given set of ancestors
-    pub fn scan_accounts<F>(&self, ancestors: &Ancestors, mut func: F)
+impl<'a, T: 'a + Clone> AccountsIndex<T> {
+    fn do_scan_accounts<F, I>(&self, ancestors: &Ancestors, mut func: F, iter: I)
     where
         F: FnMut(&Pubkey, (&T, Slot)) -> (),
+        I: Iterator<Item = (&'a Pubkey, &'a AccountMapEntry<T>)>,
     {
-        for (pubkey, list) in self.account_maps.iter() {
+        for (pubkey, list) in iter {
             let list_r = &list.1.read().unwrap();
             if let Some(index) = self.latest_slot(ancestors, &list_r) {
                 func(pubkey, (&list_r[index].1, list_r[index].0));
             }
         }
     }
 
+    /// call func with every pubkey and index visible from a given set of ancestors
+    pub fn scan_accounts<F>(&self, ancestors: &Ancestors, func: F)
+    where
+        F: FnMut(&Pubkey, (&T, Slot)) -> (),
+    {
+        self.do_scan_accounts(ancestors, func, self.account_maps.iter());
+    }
+
+    /// call func with every pubkey and index visible from a given set of ancestors with range
+    pub fn range_scan_accounts<F, R>(&self, ancestors: &Ancestors, range: R, func: F)
+    where
+        F: FnMut(&Pubkey, (&T, Slot)) -> (),
+        R: RangeBounds<Pubkey>,
+    {
+        self.do_scan_accounts(ancestors, func, self.account_maps.range(range));
+    }
+
     fn get_rooted_entries(&self, slice: SlotSlice<T>) -> SlotList<T> {
         slice
             .iter()