In a large bowl, whisk together the flour, sugar, baking soda, salt, cinnamon and ONE cup of the chopped pecans (reserve half cup for frosting). In another large bowl, beat the eggs, oil, bananas, pineapple (with the juice), and vanilla until well blended. Add the wet ingredients to the dry and stir until just combined. Make sure you scrape the bottom of the bowl to check for pockets of flour.