@Override
            public DataList<DATATYPE> get(long l, TimeUnit timeUnit) {
                return owner;
            }
A future which is always done and incurs no synchronization.
This is semantically the same as Futures.immediateFuture but contrary to it,
this never causes any memory synchronization when accessed.
container-core/src/main/java/com/yahoo/processing/response/IncomingData.java