[BugFix] fix DataDir invalid access, refactor DataDir management

* release DataDir in StorageEngine destructor * manage DataDir with unique_ptr to ease the memory deallocation Signed-off-by: Kevin Xiaohua Cai <[email protected]>
StarRocks · Sep 14, 2024 · 9a2fbb0 · 9a2fbb0
1 parent 0df6bd2
commit 9a2fbb0
Show file tree

Hide file tree

Showing 3 changed files with 18 additions and 35 deletions.
diff --git a/be/src/storage/olap_server.cpp b/be/src/storage/olap_server.cpp
@@ -117,7 +117,7 @@ Status StorageEngine::start_bg_threads() {
     // convert store map to vector
     std::vector<DataDir*> data_dirs;
     for (auto& tmp_store : _store_map) {
-        data_dirs.push_back(tmp_store.second);
+        data_dirs.push_back(tmp_store.second.get());
     }
     const auto data_dir_num = static_cast<int32_t>(data_dirs.size());
 

diff --git a/be/src/storage/storage_engine.cpp b/be/src/storage/storage_engine.cpp
@@ -149,6 +149,9 @@ StorageEngine::~StorageEngine() {
     // tablet manager need to destruct before set storage engine instance to nullptr because tablet may access storage
     // engine instance during their destruction.
     _tablet_manager.reset();
+
+    // _store can be still referenced by any tablet, make sure it is destroyed after `_tablet_manager`
+    _store_map.clear();
 #ifdef BE_TEST
     if (_s_instance == this) {
         _s_instance = _p_instance;
@@ -263,22 +266,16 @@ Status StorageEngine::_open(const EngineOptions& options) {
 }
 
 Status StorageEngine::_init_store_map() {
-    std::vector<std::pair<bool, DataDir*>> tmp_stores;
-    ScopedCleanup release_guard([&] {
-        for (const auto& item : tmp_stores) {
-            if (item.first) {
-                delete item.second;
-            }
-        }
-    });
+    std::map<std::string, std::unique_ptr<DataDir>> tmp_stores;
     std::vector<std::thread> threads;
     SpinLock error_msg_lock;
     std::string error_msg;
     for (auto& path : _options.store_paths) {
-        auto* store = new DataDir(path.path, path.storage_medium, _tablet_manager.get(), _txn_manager.get());
-        ScopedCleanup store_release_guard([&]() { delete store; });
-        tmp_stores.emplace_back(true, store);
-        store_release_guard.cancel();
+        auto store_ptr =
+                std::make_unique<DataDir>(path.path, path.storage_medium, _tablet_manager.get(), _txn_manager.get());
+        DataDir* store = store_ptr.get();
+        tmp_stores.emplace(path.path, std::move(store_ptr));
+        // store_ptr will be invalid ever since
         threads.emplace_back([store, &error_msg_lock, &error_msg]() {
             auto st = store->init();
             if (!st.ok()) {
@@ -300,12 +297,7 @@ Status StorageEngine::_init_store_map() {
         return Status::InternalError(strings::Substitute("init path failed, error=$0", error_msg));
     }
 
-    for (auto& store : tmp_stores) {
-        _store_map.emplace(store.second->path(), store.second);
-        store.first = false;
-    }
-
-    release_guard.cancel();
+    _store_map.swap(tmp_stores);
     return Status::OK();
 }
 
@@ -352,12 +344,12 @@ std::vector<DataDir*> StorageEngine::get_stores() {
     std::lock_guard<std::mutex> l(_store_lock);
     if (include_unused) {
         for (auto& it : _store_map) {
-            stores.push_back(it.second);
+            stores.push_back(it.second.get());
         }
     } else {
         for (auto& it : _store_map) {
             if (it.second->is_used()) {
-                stores.push_back(it.second);
+                stores.push_back(it.second.get());
             }
         }
     }
@@ -496,7 +488,7 @@ std::vector<DataDir*> StorageEngine::get_stores_for_create_tablet(TStorageMedium
             if (it.second->get_state() == DiskState::ONLINE) {
                 if (_available_storage_medium_type_count == 1 || it.second->storage_medium() == storage_medium) {
                     if (!it.second->capacity_limit_reached(0)) {
-                        stores.push_back(it.second);
+                        stores.push_back(it.second.get());
                     }
                 }
             }
@@ -537,14 +529,14 @@ DataDir* StorageEngine::get_store(const std::string& path) {
     if (it == std::end(_store_map)) {
         return nullptr;
     }
-    return it->second;
+    return it->second.get();
 }
 
 DataDir* StorageEngine::get_store(int64_t path_hash) {
     std::lock_guard<std::mutex> l(_store_lock);
     for (auto& it : _store_map) {
         if (it.second->path_hash() == path_hash) {
-            return it.second;
+            return it.second.get();
         }
     }
     return nullptr;
@@ -670,15 +662,6 @@ void StorageEngine::stop() {
 #undef JOIN_THREADS
 #undef JOIN_THREAD
 
-    {
-        std::lock_guard<std::mutex> l(_store_lock);
-        for (auto& store_pair : _store_map) {
-            delete store_pair.second;
-            store_pair.second = nullptr;
-        }
-        _store_map.clear();
-    }
-
     _checker_cv.notify_all();
     if (_compaction_checker_thread.joinable()) {
         _compaction_checker_thread.join();
@@ -1413,7 +1396,7 @@ void StorageEngine::increase_update_compaction_thread(const int num_threads_per_
     // convert store map to vector
     std::vector<DataDir*> data_dirs;
     for (auto& tmp_store : _store_map) {
-        data_dirs.push_back(tmp_store.second);
+        data_dirs.push_back(tmp_store.second.get());
     }
     const auto data_dir_num = static_cast<int32_t>(data_dirs.size());
     const int32_t cur_threads_per_disk = _update_compaction_threads.size() / data_dir_num;

diff --git a/be/src/storage/storage_engine.h b/be/src/storage/storage_engine.h
@@ -418,7 +418,7 @@ class StorageEngine {
 private:
     EngineOptions _options;
     std::mutex _store_lock;
-    std::map<std::string, DataDir*> _store_map;
+    std::map<std::string, std::unique_ptr<DataDir>> _store_map;
     uint32_t _available_storage_medium_type_count;
     bool _is_all_cluster_id_exist;