Merge pull request #64953 from ClickHouse/tomic

Disallow creating refreshable MV on Linux < 3.15

src/Common/atomicRename.cpp

@@ -57,11 +57,13 @@ namespace ErrorCodes
 namespace DB
 {
 
-static bool supportsAtomicRenameImpl()
+static std::optional<std::string> supportsAtomicRenameImpl()
 {
     VersionNumber renameat2_minimal_version(3, 15, 0);
     VersionNumber linux_version(Poco::Environment::osVersion());
-    return linux_version >= renameat2_minimal_version;
+    if (linux_version >= renameat2_minimal_version)
+        return std::nullopt;
+    return fmt::format("Linux kernel 3.15+ is required, got {}", linux_version.toString());
 }
 
 static bool renameat2(const std::string & old_path, const std::string & new_path, int flags)
@@ -97,10 +99,14 @@ static bool renameat2(const std::string & old_path, const std::string & new_path
     ErrnoException::throwFromPath(ErrorCodes::SYSTEM_ERROR, new_path, "Cannot rename {} to {}", old_path, new_path);
 }
 
-bool supportsAtomicRename()
+bool supportsAtomicRename(std::string * out_message)
 {
-    static bool supports = supportsAtomicRenameImpl();
-    return supports;
+    static auto error = supportsAtomicRenameImpl();
+    if (!error.has_value())
+        return true;
+    if (out_message)
+        *out_message = error.value();
+    return false;
 }
 
 }
@@ -152,16 +158,22 @@ static bool renameat2(const std::string & old_path, const std::string & new_path
 }
 
 
-static bool supportsAtomicRenameImpl()
+static std::optional<std::string> supportsAtomicRenameImpl()
 {
     auto fun = dlsym(RTLD_DEFAULT, "renamex_np");
-    return fun != nullptr;
+    if (fun != nullptr)
+        return std::nullopt;
+    return "macOS 10.12 or later is required";
 }
 
-bool supportsAtomicRename()
+bool supportsAtomicRename(std::string * out_message)
 {
-    static bool supports = supportsAtomicRenameImpl();
-    return supports;
+    static auto error = supportsAtomicRenameImpl();
+    if (!error.has_value())
+        return true;
+    if (out_message)
+        *out_message = error.value();
+    return false;
 }
 
 }
@@ -179,8 +191,10 @@ static bool renameat2(const std::string &, const std::string &, int)
     return false;
 }
 
-bool supportsAtomicRename()
+bool supportsAtomicRename(std::string * out_message)
 {
+    if (out_message)
+        *out_message = "only Linux and macOS are supported";
     return false;
 }
 

src/Common/atomicRename.h

@@ -6,7 +6,7 @@ namespace DB
 {
 
 /// Returns true, if the following functions supported by the system
-bool supportsAtomicRename();
+bool supportsAtomicRename(std::string * out_message = nullptr);
 
 /// Atomically rename old_path to new_path. If new_path exists, do not overwrite it and throw exception
 void renameNoReplace(const std::string & old_path, const std::string & new_path);

src/Databases/DatabaseAtomic.cpp

@@ -197,8 +197,9 @@ void DatabaseAtomic::renameTable(ContextPtr local_context, const String & table_
             throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Moving tables between databases of different engines is not supported");
     }
 
-    if (exchange && !supportsAtomicRename())
-        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "RENAME EXCHANGE is not supported");
+    std::string message;
+    if (exchange && !supportsAtomicRename(&message))
+        throw Exception(ErrorCodes::NOT_IMPLEMENTED, "RENAME EXCHANGE is not supported because exchanging files is not supported by the OS ({})", message);
 
     waitDatabaseStarted();
 

src/Interpreters/InterpreterCreateQuery.cpp

@@ -968,6 +968,11 @@ void InterpreterCreateQuery::validateMaterializedViewColumnsAndEngine(const ASTC
         if (database && database->getEngineName() != "Atomic")
             throw Exception(ErrorCodes::INCORRECT_QUERY,
                 "Refreshable materialized views (except with APPEND) only support Atomic database engine, but database {} has engine {}", create.getDatabase(), database->getEngineName());
+
+        std::string message;
+        if (!supportsAtomicRename(&message))
+            throw Exception(ErrorCodes::NOT_IMPLEMENTED,
+                "Can't create refreshable materialized view because exchanging files is not supported by the OS ({})", message);
     }
 
     Block input_block;