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do not start on unexpected Ordinary metadata

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This commit is contained in:
Alexander Tokmakov 2022-07-18 17:05:03 +02:00
parent 1ced1d11fd
commit 23312164bf
1 changed files with 14 additions and 0 deletions
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14
src/Databases/DatabaseFactory.cpp
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@ -126,6 +126,20 @@ DatabasePtr DatabaseFactory::getImpl(const ASTCreateQuery & create, const String
if (!create.attach && !context->getSettingsRef().allow_deprecated_database_ordinary)
throw Exception(ErrorCodes::UNKNOWN_DATABASE_ENGINE,
"Ordinary database engine is deprecated (see also allow_deprecated_database_ordinary setting)");
/// Before 20.7 metadata/db_name.sql file might absent and Ordinary database was attached if there's metadata/db_name/ dir.
/// Between 20.7 and 22.7 metadata/db_name.sql was created in this case as well.
/// Since 20.7 `default` database is created with Atomic engine on the very first server run.
/// The problem is that if server crashed during the very first run and metadata/db_name/ -> store/whatever symlink was created
/// then it's considered as Ordinary database. And it even works somehow
/// until background task tries to remove onused dir from store/...
if (fs::is_symlink(metadata_path))
throw Exception(ErrorCodes::CANNOT_CREATE_DATABASE, "Metadata directory {} for Ordinary database {} is a symbolic link to {}. "
"It may be a result of manual intervention, crash on very first server start or a bug. "
"Database cannot be attached (it's kind of protection from potential data loss). "
"Metadata directory must not be a symlink and must contain tables metadata files itself. "
"You have to resolve this manually.",
metadata_path, database_name, fs::read_symlink(metadata_path).string());
return std::make_shared<DatabaseOrdinary>(database_name, metadata_path, context);
}