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ClickHouse/src/Backups/RestorerFromBackup.cpp
Maksim Kita 2a327107b6 Updated implementation
2024-01-25 14:31:49 +03:00

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#include <Backups/RestorerFromBackup.h>
#include <Backups/IRestoreCoordination.h>
#include <Backups/BackupCoordinationStage.h>
#include <Backups/BackupSettings.h>
#include <Backups/IBackup.h>
#include <Backups/IBackupEntry.h>
#include <Backups/BackupUtils.h>
#include <Backups/DDLAdjustingForBackupVisitor.h>
#include <Access/AccessBackup.h>
#include <Access/AccessRights.h>
#include <Parsers/ParserCreateQuery.h>
#include <Parsers/parseQuery.h>
#include <Parsers/formatAST.h>
#include <Parsers/ASTCreateQuery.h>
#include <Parsers/ASTFunction.h>
#include <Interpreters/DatabaseCatalog.h>
#include <Interpreters/Context.h>
#include <Interpreters/InterpreterCreateQuery.h>
#include <Interpreters/ProcessList.h>
#include <Databases/IDatabase.h>
#include <Databases/DDLDependencyVisitor.h>
#include <Storages/IStorage.h>
#include <Common/quoteString.h>
#include <Common/escapeForFileName.h>
#include <base/insertAtEnd.h>
#include <boost/algorithm/string/join.hpp>
#include <filesystem>
namespace fs = std::filesystem;
namespace DB
{
namespace ErrorCodes
{
extern const int BACKUP_ENTRY_NOT_FOUND;
extern const int CANNOT_RESTORE_TABLE;
extern const int CANNOT_RESTORE_DATABASE;
extern const int LOGICAL_ERROR;
}
namespace Stage = BackupCoordinationStage;
namespace
{
/// Outputs "table <name>" or "temporary table <name>"
String tableNameWithTypeToString(const String & database_name, const String & table_name, bool first_upper)
{
String str;
if (database_name == DatabaseCatalog::TEMPORARY_DATABASE)
str = fmt::format("temporary table {}", backQuoteIfNeed(table_name));
else
str = fmt::format("table {}.{}", backQuoteIfNeed(database_name), backQuoteIfNeed(table_name));
if (first_upper)
str[0] = std::toupper(str[0]);
return str;
}
/// Whether a specified name corresponds one of the tables backuping ACL.
bool isSystemAccessTableName(const QualifiedTableName & table_name)
{
if (table_name.database != DatabaseCatalog::SYSTEM_DATABASE)
return false;
return (table_name.table == "users") || (table_name.table == "roles") || (table_name.table == "settings_profiles")
|| (table_name.table == "row_policies") || (table_name.table == "quotas");
}
/// Whether a specified name corresponds one of the tables backuping ACL.
bool isSystemFunctionsTableName(const QualifiedTableName & table_name)
{
return (table_name.database == DatabaseCatalog::SYSTEM_DATABASE) && (table_name.table == "functions");
}
}
RestorerFromBackup::RestorerFromBackup(
const ASTBackupQuery::Elements & restore_query_elements_,
const RestoreSettings & restore_settings_,
std::shared_ptr<IRestoreCoordination> restore_coordination_,
const BackupPtr & backup_,
const ContextMutablePtr & context_)
: restore_query_elements(restore_query_elements_)
, restore_settings(restore_settings_)
, restore_coordination(restore_coordination_)
, backup(backup_)
, context(context_)
, process_list_element(context->getProcessListElement())
, on_cluster_first_sync_timeout(context->getConfigRef().getUInt64("backups.on_cluster_first_sync_timeout", 180000))
, create_table_timeout(context->getConfigRef().getUInt64("backups.create_table_timeout", 300000))
, log(getLogger("RestorerFromBackup"))
, tables_dependencies("RestorerFromBackup")
{
}
RestorerFromBackup::~RestorerFromBackup() = default;
RestorerFromBackup::DataRestoreTasks RestorerFromBackup::run(Mode mode)
{
/// run() can be called onle once.
if (!current_stage.empty())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Already restoring");
/// Find other hosts working along with us to execute this ON CLUSTER query.
all_hosts = BackupSettings::Util::filterHostIDs(
restore_settings.cluster_host_ids, restore_settings.shard_num, restore_settings.replica_num);
/// Do renaming in the create queries according to the renaming config.
renaming_map = makeRenamingMapFromBackupQuery(restore_query_elements);
/// Calculate the root path in the backup for restoring, it's either empty or has the format "shards/<shard_num>/replicas/<replica_num>/".
findRootPathsInBackup();
/// Find all the databases and tables which we will read from the backup.
setStage(Stage::FINDING_TABLES_IN_BACKUP);
findDatabasesAndTablesInBackup();
/// Check access rights.
checkAccessForObjectsFoundInBackup();
if (mode == Mode::CHECK_ACCESS_ONLY)
return {};
/// Create databases using the create queries read from the backup.
setStage(Stage::CREATING_DATABASES);
createDatabases();
/// Create tables using the create queries read from the backup.
setStage(Stage::CREATING_TABLES);
removeUnresolvedDependencies();
createTables();
/// All what's left is to insert data to tables.
/// No more data restoring tasks are allowed after this point.
setStage(Stage::INSERTING_DATA_TO_TABLES);
return getDataRestoreTasks();
}
void RestorerFromBackup::setStage(const String & new_stage, const String & message)
{
LOG_TRACE(log, "Setting stage: {}", new_stage);
checkIsQueryCancelled();
current_stage = new_stage;
if (restore_coordination)
{
restore_coordination->setStage(new_stage, message);
if (new_stage == Stage::FINDING_TABLES_IN_BACKUP)
restore_coordination->waitForStage(new_stage, on_cluster_first_sync_timeout);
else
restore_coordination->waitForStage(new_stage);
}
}
void RestorerFromBackup::checkIsQueryCancelled() const
{
if (process_list_element)
process_list_element->checkTimeLimit();
}
void RestorerFromBackup::findRootPathsInBackup()
{
size_t shard_num = 1;
size_t replica_num = 1;
if (!restore_settings.host_id.empty())
{
std::tie(shard_num, replica_num)
= BackupSettings::Util::findShardNumAndReplicaNum(restore_settings.cluster_host_ids, restore_settings.host_id);
}
root_paths_in_backup.clear();
/// Start with "" as the root path and then we will add shard- and replica-related part to it.
fs::path root_path = "/";
root_paths_in_backup.push_back(root_path);
/// Add shard-related part to the root path.
Strings shards_in_backup = backup->listFiles(root_path / "shards");
if (shards_in_backup.empty())
{
if (restore_settings.shard_num_in_backup > 1)
throw Exception(ErrorCodes::BACKUP_ENTRY_NOT_FOUND, "No shard #{} in backup", restore_settings.shard_num_in_backup);
}
else
{
String shard_name;
if (restore_settings.shard_num_in_backup)
shard_name = std::to_string(restore_settings.shard_num_in_backup);
else if (shards_in_backup.size() == 1)
shard_name = shards_in_backup.front();
else
shard_name = std::to_string(shard_num);
if (std::find(shards_in_backup.begin(), shards_in_backup.end(), shard_name) == shards_in_backup.end())
throw Exception(ErrorCodes::BACKUP_ENTRY_NOT_FOUND, "No shard #{} in backup", shard_name);
root_path = root_path / "shards" / shard_name;
root_paths_in_backup.push_back(root_path);
}
/// Add replica-related part to the root path.
Strings replicas_in_backup = backup->listFiles(root_path / "replicas");
if (replicas_in_backup.empty())
{
if (restore_settings.replica_num_in_backup > 1)
throw Exception(ErrorCodes::BACKUP_ENTRY_NOT_FOUND, "No replica #{} in backup", restore_settings.replica_num_in_backup);
}
else
{
String replica_name;
if (restore_settings.replica_num_in_backup)
{
replica_name = std::to_string(restore_settings.replica_num_in_backup);
if (std::find(replicas_in_backup.begin(), replicas_in_backup.end(), replica_name) == replicas_in_backup.end())
throw Exception(ErrorCodes::BACKUP_ENTRY_NOT_FOUND, "No replica #{} in backup", replica_name);
}
else
{
replica_name = std::to_string(replica_num);
if (std::find(replicas_in_backup.begin(), replicas_in_backup.end(), replica_name) == replicas_in_backup.end())
replica_name = replicas_in_backup.front();
}
root_path = root_path / "replicas" / replica_name;
root_paths_in_backup.push_back(root_path);
}
/// Revert the list of root paths, because we need it in the following order:
/// "/shards/<shard_num>/replicas/<replica_num>/" (first we search tables here)
/// "/shards/<shard_num>/" (then here)
/// "/" (and finally here)
std::reverse(root_paths_in_backup.begin(), root_paths_in_backup.end());
LOG_TRACE(
log,
"Will use paths in backup: {}",
boost::algorithm::join(
root_paths_in_backup
| boost::adaptors::transformed([](const fs::path & path) -> String { return doubleQuoteString(String{path}); }),
", "));
}
void RestorerFromBackup::findDatabasesAndTablesInBackup()
{
database_infos.clear();
table_infos.clear();
for (const auto & element : restore_query_elements)
{
switch (element.type)
{
case ASTBackupQuery::ElementType::TABLE:
{
findTableInBackup({element.database_name, element.table_name}, element.partitions);
break;
}
case ASTBackupQuery::ElementType::TEMPORARY_TABLE:
{
findTableInBackup({DatabaseCatalog::TEMPORARY_DATABASE, element.table_name}, element.partitions);
break;
}
case ASTBackupQuery::ElementType::DATABASE:
{
findDatabaseInBackup(element.database_name, element.except_tables);
break;
}
case ASTBackupQuery::ElementType::ALL:
{
findEverythingInBackup(element.except_databases, element.except_tables);
break;
}
}
}
LOG_INFO(log, "Will restore {} databases and {} tables", database_infos.size(), table_infos.size());
}
void RestorerFromBackup::findTableInBackup(const QualifiedTableName & table_name_in_backup, const std::optional<ASTs> & partitions)
{
bool is_temporary_table = (table_name_in_backup.database == DatabaseCatalog::TEMPORARY_DATABASE);
std::optional<fs::path> metadata_path;
std::optional<fs::path> root_path_in_use;
for (const auto & root_path_in_backup : root_paths_in_backup)
{
fs::path try_metadata_path;
if (is_temporary_table)
{
try_metadata_path
= root_path_in_backup / "temporary_tables" / "metadata" / (escapeForFileName(table_name_in_backup.table) + ".sql");
}
else
{
try_metadata_path = root_path_in_backup / "metadata" / escapeForFileName(table_name_in_backup.database)
/ (escapeForFileName(table_name_in_backup.table) + ".sql");
}
if (backup->fileExists(try_metadata_path))
{
metadata_path = try_metadata_path;
root_path_in_use = root_path_in_backup;
break;
}
}
if (!metadata_path)
throw Exception(
ErrorCodes::BACKUP_ENTRY_NOT_FOUND,
"{} not found in backup",
tableNameWithTypeToString(table_name_in_backup.database, table_name_in_backup.table, true));
fs::path data_path_in_backup;
if (is_temporary_table)
{
data_path_in_backup = *root_path_in_use / "temporary_tables" / "data" / escapeForFileName(table_name_in_backup.table);
}
else
{
data_path_in_backup
= *root_path_in_use / "data" / escapeForFileName(table_name_in_backup.database) / escapeForFileName(table_name_in_backup.table);
}
auto read_buffer = backup->readFile(*metadata_path);
String create_query_str;
readStringUntilEOF(create_query_str, *read_buffer);
read_buffer.reset();
ParserCreateQuery create_parser;
ASTPtr create_table_query = parseQuery(create_parser, create_query_str, 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
applyCustomStoragePolicy(create_table_query);
renameDatabaseAndTableNameInCreateQuery(create_table_query, renaming_map, context->getGlobalContext());
QualifiedTableName table_name = renaming_map.getNewTableName(table_name_in_backup);
if (auto it = table_infos.find(table_name); it != table_infos.end())
{
const TableInfo & table_info = it->second;
if (table_info.create_table_query && (serializeAST(*table_info.create_table_query) != serializeAST(*create_table_query)))
{
throw Exception(
ErrorCodes::CANNOT_RESTORE_TABLE,
"Extracted two different create queries for the same {}: {} and {}",
tableNameWithTypeToString(table_name.database, table_name.table, false),
serializeAST(*table_info.create_table_query),
serializeAST(*create_table_query));
}
}
TableInfo & res_table_info = table_infos[table_name];
res_table_info.create_table_query = create_table_query;
res_table_info.is_predefined_table = DatabaseCatalog::instance().isPredefinedTable(StorageID{table_name.database, table_name.table});
res_table_info.has_data = backup->hasFiles(data_path_in_backup);
res_table_info.data_path_in_backup = data_path_in_backup;
tables_dependencies.addDependencies(table_name, getDependenciesFromCreateQuery(context, table_name, create_table_query));
if (partitions)
{
if (!res_table_info.partitions)
res_table_info.partitions.emplace();
insertAtEnd(*res_table_info.partitions, *partitions);
}
/// Special handling for ACL-related system tables.
if (!restore_settings.structure_only && isSystemAccessTableName(table_name))
{
if (!access_restorer)
access_restorer = std::make_unique<AccessRestorerFromBackup>(backup, restore_settings);
try
{
/// addDataPath() will parse access*.txt files and extract access entities from them.
/// We need to do that early because we need those access entities to check access.
access_restorer->addDataPath(data_path_in_backup);
}
catch (Exception & e)
{
e.addMessage("While parsing data of {} from backup", tableNameWithTypeToString(table_name.database, table_name.table, false));
throw;
}
}
}
void RestorerFromBackup::findDatabaseInBackup(const String & database_name_in_backup, const std::set<DatabaseAndTableName> & except_table_names)
{
std::optional<fs::path> metadata_path;
std::unordered_set<String> table_names_in_backup;
for (const auto & root_path_in_backup : root_paths_in_backup)
{
fs::path try_metadata_path, try_tables_metadata_path;
if (database_name_in_backup == DatabaseCatalog::TEMPORARY_DATABASE)
{
try_tables_metadata_path = root_path_in_backup / "temporary_tables" / "metadata";
}
else
{
try_metadata_path = root_path_in_backup / "metadata" / (escapeForFileName(database_name_in_backup) + ".sql");
try_tables_metadata_path = root_path_in_backup / "metadata" / escapeForFileName(database_name_in_backup);
}
if (!metadata_path && !try_metadata_path.empty() && backup->fileExists(try_metadata_path))
metadata_path = try_metadata_path;
Strings file_names = backup->listFiles(try_tables_metadata_path);
for (const String & file_name : file_names)
{
if (!file_name.ends_with(".sql"))
continue;
String file_name_without_ext = file_name.substr(0, file_name.length() - strlen(".sql"));
table_names_in_backup.insert(unescapeForFileName(file_name_without_ext));
}
}
if (!metadata_path && table_names_in_backup.empty())
throw Exception(ErrorCodes::BACKUP_ENTRY_NOT_FOUND, "Database {} not found in backup", backQuoteIfNeed(database_name_in_backup));
if (metadata_path)
{
auto read_buffer = backup->readFile(*metadata_path);
String create_query_str;
readStringUntilEOF(create_query_str, *read_buffer);
read_buffer.reset();
ParserCreateQuery create_parser;
ASTPtr create_database_query = parseQuery(create_parser, create_query_str, 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
renameDatabaseAndTableNameInCreateQuery(create_database_query, renaming_map, context->getGlobalContext());
String database_name = renaming_map.getNewDatabaseName(database_name_in_backup);
DatabaseInfo & database_info = database_infos[database_name];
if (database_info.create_database_query && (serializeAST(*database_info.create_database_query) != serializeAST(*create_database_query)))
{
throw Exception(
ErrorCodes::CANNOT_RESTORE_DATABASE,
"Extracted two different create queries for the same database {}: {} and {}",
backQuoteIfNeed(database_name),
serializeAST(*database_info.create_database_query),
serializeAST(*create_database_query));
}
database_info.create_database_query = create_database_query;
database_info.is_predefined_database = DatabaseCatalog::isPredefinedDatabase(database_name);
}
for (const String & table_name_in_backup : table_names_in_backup)
{
if (except_table_names.contains({database_name_in_backup, table_name_in_backup}))
continue;
findTableInBackup({database_name_in_backup, table_name_in_backup}, /* partitions= */ {});
}
}
void RestorerFromBackup::findEverythingInBackup(const std::set<String> & except_database_names, const std::set<DatabaseAndTableName> & except_table_names)
{
std::unordered_set<String> database_names_in_backup;
for (const auto & root_path_in_backup : root_paths_in_backup)
{
Strings file_names = backup->listFiles(root_path_in_backup / "metadata");
for (String & file_name : file_names)
{
if (file_name.ends_with(".sql"))
file_name.resize(file_name.length() - strlen(".sql"));
database_names_in_backup.emplace(unescapeForFileName(file_name));
}
if (backup->hasFiles(root_path_in_backup / "temporary_tables" / "metadata"))
database_names_in_backup.emplace(DatabaseCatalog::TEMPORARY_DATABASE);
}
for (const String & database_name_in_backup : database_names_in_backup)
{
if (except_database_names.contains(database_name_in_backup))
continue;
findDatabaseInBackup(database_name_in_backup, except_table_names);
}
}
void RestorerFromBackup::checkAccessForObjectsFoundInBackup() const
{
AccessRightsElements required_access;
for (const auto & [database_name, database_info] : database_infos)
{
if (database_info.is_predefined_database)
continue;
AccessFlags flags;
if (restore_settings.create_database != RestoreDatabaseCreationMode::kMustExist)
flags |= AccessType::CREATE_DATABASE;
if (!flags)
flags = AccessType::SHOW_DATABASES;
required_access.emplace_back(flags, database_name);
}
for (const auto & [table_name, table_info] : table_infos)
{
if (table_info.is_predefined_table)
{
if (isSystemFunctionsTableName(table_name))
{
/// CREATE_FUNCTION privilege is required to restore the "system.functions" table.
if (!restore_settings.structure_only && table_info.has_data)
required_access.emplace_back(AccessType::CREATE_FUNCTION);
}
/// Privileges required to restore ACL system tables are checked separately
/// (see access_restore_task->getRequiredAccess() below).
continue;
}
if (table_name.database == DatabaseCatalog::TEMPORARY_DATABASE)
{
if (restore_settings.create_table != RestoreTableCreationMode::kMustExist)
required_access.emplace_back(AccessType::CREATE_TEMPORARY_TABLE);
continue;
}
AccessFlags flags;
const ASTCreateQuery & create = table_info.create_table_query->as<const ASTCreateQuery &>();
if (restore_settings.create_table != RestoreTableCreationMode::kMustExist)
{
if (create.is_dictionary)
flags |= AccessType::CREATE_DICTIONARY;
else if (create.is_ordinary_view || create.is_materialized_view || create.is_live_view)
flags |= AccessType::CREATE_VIEW;
else
flags |= AccessType::CREATE_TABLE;
}
if (!restore_settings.structure_only && table_info.has_data)
{
flags |= AccessType::INSERT;
}
if (!flags)
{
if (create.is_dictionary)
flags = AccessType::SHOW_DICTIONARIES;
else
flags = AccessType::SHOW_TABLES;
}
required_access.emplace_back(flags, table_name.database, table_name.table);
}
if (access_restorer)
insertAtEnd(required_access, access_restorer->getRequiredAccess());
/// We convert to AccessRights and back to check access rights in a predictable way
/// (some elements could be duplicated or not sorted).
required_access = AccessRights{required_access}.getElements();
context->checkAccess(required_access);
}
void RestorerFromBackup::createDatabases()
{
for (const auto & database_name : database_infos | boost::adaptors::map_keys)
{
createDatabase(database_name);
checkDatabase(database_name);
}
}
void RestorerFromBackup::createDatabase(const String & database_name) const
{
if (restore_settings.create_database == RestoreDatabaseCreationMode::kMustExist)
return;
/// Predefined databases always exist.
const auto & database_info = database_infos.at(database_name);
if (database_info.is_predefined_database)
return;
checkIsQueryCancelled();
auto create_database_query = typeid_cast<std::shared_ptr<ASTCreateQuery>>(database_info.create_database_query->clone());
/// Generate a new UUID for a database.
/// The generated UUID will be ignored if the database does not support UUIDs.
restore_coordination->generateUUIDForTable(*create_database_query);
/// Add the clause `IF NOT EXISTS` if that is specified in the restore settings.
create_database_query->if_not_exists = (restore_settings.create_table == RestoreTableCreationMode::kCreateIfNotExists);
LOG_TRACE(log, "Creating database {}: {}", backQuoteIfNeed(database_name), serializeAST(*create_database_query));
auto query_context = Context::createCopy(context);
query_context->setSetting("allow_deprecated_database_ordinary", 1);
try
{
/// Execute CREATE DATABASE query.
InterpreterCreateQuery interpreter{create_database_query, query_context};
interpreter.setInternal(true);
interpreter.execute();
}
catch (Exception & e)
{
e.addMessage("While creating database {}", backQuoteIfNeed(database_name));
throw;
}
}
void RestorerFromBackup::checkDatabase(const String & database_name)
{
auto & database_info = database_infos.at(database_name);
try
{
DatabasePtr database = DatabaseCatalog::instance().getDatabase(database_name);
database_info.database = database;
if (!restore_settings.allow_different_database_def && !database_info.is_predefined_database)
{
/// Check that the database's definition is the same as expected.
ASTPtr existing_database_def = database->getCreateDatabaseQuery();
ASTPtr database_def_from_backup = database_info.create_database_query;
if (!compareRestoredDatabaseDef(*existing_database_def, *database_def_from_backup, context->getGlobalContext()))
{
throw Exception(
ErrorCodes::CANNOT_RESTORE_DATABASE,
"The database has a different definition: {} "
"comparing to its definition in the backup: {}",
serializeAST(*existing_database_def),
serializeAST(*database_def_from_backup));
}
}
}
catch (Exception & e)
{
e.addMessage("While checking database {}", backQuoteIfNeed(database_name));
throw;
}
}
void RestorerFromBackup::applyCustomStoragePolicy(ASTPtr query_ptr)
{
constexpr auto setting_name = "storage_policy";
if (query_ptr && restore_settings.storage_policy.has_value())
{
ASTStorage * storage = query_ptr->as<ASTCreateQuery &>().storage;
if (storage && storage->settings)
{
if (restore_settings.storage_policy.value().empty())
/// it has been set to "" deliberately, so the source storage policy is erased
storage->settings->changes.removeSetting(setting_name);
else
/// it has been set to a custom value, so it either overwrites the existing value or is added as a new one
storage->settings->changes.setSetting(setting_name, restore_settings.storage_policy.value());
}
}
}
void RestorerFromBackup::removeUnresolvedDependencies()
{
auto need_exclude_dependency = [this](const StorageID & table_id)
{
/// Table will be restored.
if (table_infos.contains(table_id.getQualifiedName()))
return false;
/// Table exists and it already exists
if (!DatabaseCatalog::instance().isTableExist(table_id, context))
{
LOG_WARNING(
log,
"Tables {} in backup depend on {}, but seems like {} is not in the backup and does not exist. "
"Will try to ignore that and restore tables",
fmt::join(tables_dependencies.getDependents(table_id), ", "),
table_id,
table_id);
}
size_t num_dependencies, num_dependents;
tables_dependencies.getNumberOfAdjacents(table_id, num_dependencies, num_dependents);
if (num_dependencies || !num_dependents)
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Table {} in backup doesn't have dependencies and dependent tables as it expected to. It's a bug",
table_id);
return true; /// Exclude this dependency.
};
tables_dependencies.removeTablesIf(need_exclude_dependency);
if (tables_dependencies.getNumberOfTables() != table_infos.size())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Number of tables to be restored is not as expected. It's a bug");
if (tables_dependencies.hasCyclicDependencies())
{
LOG_WARNING(
log,
"Tables {} in backup have cyclic dependencies: {}. Will try to ignore that and restore tables",
fmt::join(tables_dependencies.getTablesWithCyclicDependencies(), ", "),
tables_dependencies.describeCyclicDependencies());
}
}
void RestorerFromBackup::createTables()
{
/// We need to create tables considering their dependencies.
tables_dependencies.log();
auto tables_to_create = tables_dependencies.getTablesSortedByDependency();
for (const auto & table_id : tables_to_create)
{
auto table_name = table_id.getQualifiedName();
createTable(table_name);
checkTable(table_name);
insertDataToTable(table_name);
}
}
void RestorerFromBackup::createTable(const QualifiedTableName & table_name)
{
if (restore_settings.create_table == RestoreTableCreationMode::kMustExist)
return;
/// Predefined tables always exist.
auto & table_info = table_infos.at(table_name);
if (table_info.is_predefined_table)
return;
checkIsQueryCancelled();
auto create_table_query = typeid_cast<std::shared_ptr<ASTCreateQuery>>(table_info.create_table_query->clone());
/// Generate a new UUID for a table (the same table on different hosts must use the same UUID, `restore_coordination` will make it so).
/// The generated UUID will be ignored if the database does not support UUIDs.
restore_coordination->generateUUIDForTable(*create_table_query);
/// Add the clause `IF NOT EXISTS` if that is specified in the restore settings.
create_table_query->if_not_exists = (restore_settings.create_table == RestoreTableCreationMode::kCreateIfNotExists);
LOG_TRACE(
log, "Creating {}: {}", tableNameWithTypeToString(table_name.database, table_name.table, false), serializeAST(*create_table_query));
try
{
if (!table_info.database)
table_info.database = DatabaseCatalog::instance().getDatabase(table_name.database);
DatabasePtr database = table_info.database;
/// Execute CREATE TABLE query (we call IDatabase::createTableRestoredFromBackup() to allow the database to do some
/// database-specific things).
database->createTableRestoredFromBackup(
create_table_query,
context,
restore_coordination,
std::chrono::duration_cast<std::chrono::milliseconds>(create_table_timeout).count());
}
catch (Exception & e)
{
e.addMessage("While creating {}", tableNameWithTypeToString(table_name.database, table_name.table, false));
throw;
}
}
void RestorerFromBackup::checkTable(const QualifiedTableName & table_name)
{
auto & table_info = table_infos.at(table_name);
try
{
auto resolved_id = (table_name.database == DatabaseCatalog::TEMPORARY_DATABASE)
? context->resolveStorageID(StorageID{"", table_name.table}, Context::ResolveExternal)
: context->resolveStorageID(StorageID{table_name.database, table_name.table}, Context::ResolveGlobal);
if (!table_info.database)
table_info.database = DatabaseCatalog::instance().getDatabase(table_name.database);
DatabasePtr database = table_info.database;
StoragePtr storage = database->getTable(resolved_id.table_name, context);
table_info.storage = storage;
table_info.table_lock = storage->lockForShare(context->getInitialQueryId(), context->getSettingsRef().lock_acquire_timeout);
if (!restore_settings.allow_different_table_def && !table_info.is_predefined_table)
{
ASTPtr existing_table_def = database->getCreateTableQuery(resolved_id.table_name, context);
ASTPtr table_def_from_backup = table_info.create_table_query;
if (!compareRestoredTableDef(*existing_table_def, *table_def_from_backup, context->getGlobalContext()))
{
throw Exception(
ErrorCodes::CANNOT_RESTORE_TABLE,
"The table has a different definition: {} "
"comparing to its definition in the backup: {}",
serializeAST(*existing_table_def),
serializeAST(*table_def_from_backup));
}
}
}
catch (Exception & e)
{
e.addMessage("While checking {}", tableNameWithTypeToString(table_name.database, table_name.table, false));
throw;
}
}
void RestorerFromBackup::insertDataToTable(const QualifiedTableName & table_name)
{
if (restore_settings.structure_only)
return;
auto & table_info = table_infos.at(table_name);
auto storage = table_info.storage;
checkIsQueryCancelled();
try
{
const auto & data_path_in_backup = table_info.data_path_in_backup;
const auto & partitions = table_info.partitions;
if (partitions && !storage->supportsBackupPartition())
{
throw Exception(
ErrorCodes::CANNOT_RESTORE_TABLE,
"Table engine {} doesn't support partitions",
storage->getName());
}
storage->restoreDataFromBackup(*this, data_path_in_backup, partitions);
}
catch (Exception & e)
{
e.addMessage("While restoring data of {}", tableNameWithTypeToString(table_name.database, table_name.table, false));
throw;
}
}
void RestorerFromBackup::addDataRestoreTask(DataRestoreTask && new_task)
{
if (current_stage == Stage::INSERTING_DATA_TO_TABLES)
throw Exception(ErrorCodes::LOGICAL_ERROR, "Adding of data-restoring tasks is not allowed");
data_restore_tasks.push_back(std::move(new_task));
}
void RestorerFromBackup::addDataRestoreTasks(DataRestoreTasks && new_tasks)
{
if (current_stage == Stage::INSERTING_DATA_TO_TABLES)
throw Exception(ErrorCodes::LOGICAL_ERROR, "Adding of data-restoring tasks is not allowed");
insertAtEnd(data_restore_tasks, std::move(new_tasks));
}
RestorerFromBackup::DataRestoreTasks RestorerFromBackup::getDataRestoreTasks()
{
if (data_restore_tasks.empty())
return {};
LOG_TRACE(log, "Will insert data to tables");
/// Storages and table locks must exist while we're executing data restoring tasks.
auto storages = std::make_shared<std::vector<StoragePtr>>();
auto table_locks = std::make_shared<std::vector<TableLockHolder>>();
storages->reserve(table_infos.size());
table_locks->reserve(table_infos.size());
for (const auto & table_info : table_infos | boost::adaptors::map_values)
{
storages->push_back(table_info.storage);
table_locks->push_back(table_info.table_lock);
}
DataRestoreTasks res_tasks;
for (const auto & task : data_restore_tasks)
res_tasks.push_back([task, storages, table_locks] { task(); });
return res_tasks;
}
std::vector<std::pair<UUID, AccessEntityPtr>> RestorerFromBackup::getAccessEntitiesToRestore()
{
if (!access_restorer || access_restored)
return {};
/// getAccessEntitiesToRestore() will return entities only when called first time (we don't want to restore the same entities again).
access_restored = true;
return access_restorer->getAccessEntities(context->getAccessControl());
}
void RestorerFromBackup::throwTableIsNotEmpty(const StorageID & storage_id)
{
throw Exception(
ErrorCodes::CANNOT_RESTORE_TABLE,
"Cannot restore the table {} because it already contains some data. You can set structure_only=true or "
"allow_non_empty_tables=true to overcome that in the way you want",
storage_id.getFullTableName());
}
}
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