function isCluster(Connection $connection)
{
static $isCluster = null;
if ($isCluster === null) {
$adminHandler = new AdminHandler($connection);
try {
$role = $adminHandler->getServerRole();
$isCluster = $role === 'COORDINATOR' || $role === 'DBSERVER';
} catch (\Exception $e) {
// maybe server version is too "old"
$isCluster = false;
}
}
return $isCluster;
}