The passed durability of Append/Increment isn't used in wal sync

private Result doDelta(...) {
        Durability effectiveDurability = getEffectiveDurability(mutation.getDurability());
        Map<Store, List<Cell>> forMemStore =
            new HashMap<Store, List<Cell>>(mutation.getFamilyCellMap().size());
        // Reckon Cells to apply to WAL --  in returned walEdit -- and what to add to memstore and
        // what to return back to the client (in 'forMemStore' and 'results' respectively).
        WALEdit walEdit = reckonDeltas(op, mutation, effectiveDurability, forMemStore, results);
        // Actually write to WAL now if a walEdit to apply.
        if (walEdit != null && !walEdit.isEmpty()) {
          writeEntry = doWALAppend(walEdit, durability, nonceGroup, nonce);
        } else {
}