apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/service/NamespaceService.java/NamespaceService/assignNamespaceRoleToOperator
class NamespaceService:  public void assignNamespaceRoleToOperator(String appId, String namespaceName, String operator) {
    //default assign modify、release namespace role to namespace creator

    rolePermissionService
        .assignRoleToUsers(
            RoleUtils.buildNamespaceRoleName(appId, namespaceName, RoleType.MODIFY_NAMESPACE),
            Sets.newHashSet(operator), operator);
    rolePermissionService
        .assignRoleToUsers(
            RoleUtils.buildNamespaceRoleName(appId, namespaceName, RoleType.RELEASE_NAMESPACE),
            Sets.newHashSet(operator), operator);
  }