Fix race in StorageSystemRocksDB truncate

src/Storages/RocksDB/StorageEmbeddedRocksDB.cpp

@@ -36,6 +36,8 @@
 #include <rocksdb/convenience.h>
 
 #include <filesystem>
+#include <mutex>
+#include <shared_mutex>
 
 
 namespace fs = std::filesystem;
@@ -213,9 +215,9 @@ public:
         std::vector<rocksdb::Slice> slices_keys(num_keys);
 
         const auto & sample_block = metadata_snapshot->getSampleBlock();
-        const auto & key_column = sample_block.getByName(storage.primary_key);
+        const auto & key_column = sample_block.getByName(storage.getPrimaryKey());
         auto columns = sample_block.cloneEmptyColumns();
-        size_t primary_key_pos = sample_block.getPositionByName(storage.primary_key);
+        size_t primary_key_pos = sample_block.getPositionByName(storage.getPrimaryKey());
 
         size_t rows_processed = 0;
         while (it < end && rows_processed < max_block_size)
@@ -230,8 +232,7 @@ public:
         }
 
         std::vector<String> values;
-        auto statuses = storage.rocksdb_ptr->MultiGet(rocksdb::ReadOptions(), slices_keys, &values);
-
+        auto statuses = storage.multiGet(slices_keys, values);
         for (size_t i = 0; i < statuses.size(); ++i)
         {
             if (statuses[i].ok())
@@ -285,7 +286,10 @@ StorageEmbeddedRocksDB::StorageEmbeddedRocksDB(const StorageID & table_id_,
 
 void StorageEmbeddedRocksDB::truncate(const ASTPtr &, const StorageMetadataPtr & , ContextPtr, TableExclusiveLockHolder &)
 {
+    std::unique_lock<std::shared_mutex> lock(rocksdb_ptr_mx);
     rocksdb_ptr->Close();
+    rocksdb_ptr = nullptr;
+
     fs::remove_all(rocksdb_dir);
     fs::create_directories(rocksdb_dir);
     initDb();
@@ -460,9 +464,20 @@ static StoragePtr create(const StorageFactory::Arguments & args)
 
 std::shared_ptr<rocksdb::Statistics> StorageEmbeddedRocksDB::getRocksDBStatistics() const
 {
+    std::shared_lock<std::shared_mutex> lock(rocksdb_ptr_mx);
+    if (!rocksdb_ptr)
+        return nullptr;
     return rocksdb_ptr->GetOptions().statistics;
 }
 
+std::vector<rocksdb::Status> StorageEmbeddedRocksDB::multiGet(const std::vector<rocksdb::Slice> & slices_keys, std::vector<String> & values) const
+{
+    std::shared_lock<std::shared_mutex> lock(rocksdb_ptr_mx);
+    if (!rocksdb_ptr)
+        return {};
+    return rocksdb_ptr->MultiGet(rocksdb::ReadOptions(), slices_keys, &values);
+}
+
 void registerStorageEmbeddedRocksDB(StorageFactory & factory)
 {
     StorageFactory::StorageFeatures features{

src/Storages/RocksDB/StorageEmbeddedRocksDB.h

@@ -1,14 +1,17 @@
 #pragma once
 
 #include <memory>
+#include <shared_mutex>
 #include <common/shared_ptr_helper.h>
 #include <Storages/IStorage.h>
+#include <rocksdb/status.h>
 
 
 namespace rocksdb
 {
     class DB;
     class Statistics;
+    class Slice;
 }
 
 
@@ -20,7 +23,6 @@ class Context;
 class StorageEmbeddedRocksDB final : public shared_ptr_helper<StorageEmbeddedRocksDB>, public IStorage, WithContext
 {
     friend struct shared_ptr_helper<StorageEmbeddedRocksDB>;
-    friend class EmbeddedRocksDBSource;
     friend class EmbeddedRocksDBSink;
     friend class EmbeddedRocksDBBlockInputStream;
 public:
@@ -50,6 +52,8 @@ public:
     Strings getDataPaths() const override { return {rocksdb_dir}; }
 
     std::shared_ptr<rocksdb::Statistics> getRocksDBStatistics() const;
+    std::vector<rocksdb::Status> multiGet(const std::vector<rocksdb::Slice> & slices_keys, std::vector<String> & values) const;
+    const String & getPrimaryKey() const { return primary_key; }
 
 protected:
     StorageEmbeddedRocksDB(const StorageID & table_id_,
@@ -63,6 +67,7 @@ private:
     const String primary_key;
     using RocksDBPtr = std::unique_ptr<rocksdb::DB>;
     RocksDBPtr rocksdb_ptr;
+    mutable std::shared_mutex rocksdb_ptr_mx;
     String rocksdb_dir;
 
     void initDb();

src/Storages/RocksDB/StorageSystemRocksDB.cpp

@@ -103,7 +103,7 @@ void StorageSystemRocksDB::fillData(MutableColumns & res_columns, ContextPtr con
 
         auto statistics = tables[database][table]->getRocksDBStatistics();
         if (!statistics)
-            throw Exception(ErrorCodes::LOGICAL_ERROR, "rocksdb statistics is not enabled");
+            throw Exception(ErrorCodes::LOGICAL_ERROR, "RocksDB statistics is not avaliable");
 
         for (auto [tick, name] : rocksdb::TickersNameMap)
         {