Rwlock storage opt (#9006)

* Remove unecessary account paths rwlock

* Remove path rwlock in accounts_db and optimize storage critical section

runtime/src/accounts_db.rs

@@ -440,7 +440,7 @@ pub struct AccountsDB {
     write_version: AtomicUsize,
 
     /// Set of storage paths to pick from
-    paths: RwLock<Vec<PathBuf>>,
+    paths: Vec<PathBuf>,
 
     /// Directory of paths this accounts_db needs to hold/remove
     temp_paths: Option<Vec<TempDir>>,
@@ -469,7 +469,7 @@ impl Default for AccountsDB {
             storage: RwLock::new(AccountStorage(HashMap::new())),
             next_id: AtomicUsize::new(0),
             write_version: AtomicUsize::new(0),
-            paths: RwLock::new(vec![]),
+            paths: vec![],
             temp_paths: None,
             file_size: DEFAULT_FILE_SIZE,
             thread_pool: rayon::ThreadPoolBuilder::new()
@@ -486,7 +486,7 @@ impl AccountsDB {
     pub fn new(paths: Vec<PathBuf>) -> Self {
         let new = if !paths.is_empty() {
             Self {
-                paths: RwLock::new(paths),
+                paths,
                 temp_paths: None,
                 ..Self::default()
             }
@@ -495,14 +495,13 @@ impl AccountsDB {
             // for testing
             let (temp_dirs, paths) = get_temp_accounts_paths(DEFAULT_NUM_DIRS).unwrap();
             Self {
-                paths: RwLock::new(paths),
+                paths,
                 temp_paths: Some(temp_dirs),
                 ..Self::default()
             }
         };
         {
-            let paths = new.paths.read().unwrap();
-            for path in paths.iter() {
+            for path in new.paths.iter() {
                 std::fs::create_dir_all(path).expect("Create directory failed.");
             }
         }
@@ -527,7 +526,6 @@ impl AccountsDB {
     pub fn accounts_from_stream<R: Read, P: AsRef<Path>>(
         &self,
         mut stream: &mut BufReader<R>,
-        local_account_paths: &[PathBuf],
         append_vecs_path: P,
     ) -> Result<(), IOError> {
         let _len: usize =
@@ -542,8 +540,8 @@ impl AccountsDB {
             .map(|(slot_id, mut slot_storage)| {
                 let mut new_slot_storage = HashMap::new();
                 for (id, storage_entry) in slot_storage.drain() {
-                    let path_index = thread_rng().gen_range(0, local_account_paths.len());
-                    let local_dir = &local_account_paths[path_index];
+                    let path_index = thread_rng().gen_range(0, self.paths.len());
+                    let local_dir = &self.paths[path_index];
 
                     std::fs::create_dir_all(local_dir).expect("Create directory failed");
 
@@ -602,7 +600,6 @@ impl AccountsDB {
         self.bank_hashes.write().unwrap().insert(slot, bank_hash);
 
         // Process deserialized data, set necessary fields in self
-        *self.paths.write().unwrap() = local_account_paths.to_vec();
         let max_id: usize = *storage
             .0
             .values()
@@ -938,22 +935,14 @@ impl AccountsDB {
     }
 
     fn create_and_insert_store(&self, slot_id: Slot, size: u64) -> Arc<AccountStorageEntry> {
+        let path_index = thread_rng().gen_range(0, self.paths.len());
+        let store =
+            Arc::new(self.new_storage_entry(slot_id, &Path::new(&self.paths[path_index]), size));
+        let store_for_index = store.clone();
+
         let mut stores = self.storage.write().unwrap();
         let slot_storage = stores.0.entry(slot_id).or_insert_with(HashMap::new);
-
-        self.create_store(slot_id, slot_storage, size)
-    }
-
-    fn create_store(
-        &self,
-        slot_id: Slot,
-        slot_storage: &mut SlotStores,
-        size: u64,
-    ) -> Arc<AccountStorageEntry> {
-        let paths = self.paths.read().unwrap();
-        let path_index = thread_rng().gen_range(0, paths.len());
-        let store = Arc::new(self.new_storage_entry(slot_id, &Path::new(&paths[path_index]), size));
-        slot_storage.insert(store.id, store.clone());
+        slot_storage.insert(store.id, store_for_index);
         store
     }
 
@@ -2332,12 +2321,11 @@ pub mod tests {
         let buf = writer.into_inner();
         let mut reader = BufReader::new(&buf[..]);
         let daccounts = AccountsDB::new(Vec::new());
-        let local_paths = daccounts.paths.read().unwrap().clone();
         let copied_accounts = TempDir::new().unwrap();
         // Simulate obtaining a copy of the AppendVecs from a tarball
         copy_append_vecs(&accounts, copied_accounts.path()).unwrap();
         daccounts
-            .accounts_from_stream(&mut reader, &local_paths, copied_accounts.path())
+            .accounts_from_stream(&mut reader, copied_accounts.path())
             .unwrap();
 
         print_count_and_status("daccounts", &daccounts);