A method of providing concurrent access to a hierarchy in a data structure may include receiving a request from a first process to change a first value associated with an object, where the request may include a second value to be combined with the first value. The method may also include determining that a second process is currently accessing information associated with the object. The method may additionally include associating, in response to determining that the second process is currently accessing information associated with the object, the second value with the object without combining the first value and the second value.