Preheat oven to 350F.
Spray two 9-inch round cake pans with pam baking spray and set aside.
Drain the pineapple in a fine-mesh strainer set over a small saucepan, pressing to remove as much juice as possible.
Place the saucepan over medium heat until reduced to ? cup, about 5 minutes; set aside.
In a medium bowl, whisk together the flour, baking powder, baking soda, cinnamon and salt.
Using a standing mixer, beat together the sugar and eggs, and the oil.
Beat in the bananas, pecans, vanilla, drained pineapple, and reduced pineapple juice.
Gradually mix in the flour mixture until just combined.
Divide the batter evenly between and bake until dark golden brown on top and a toothpick inserted in the center comes out clean, 50 to 55 minutes
Let the cakes cool in pans on a wire rack for 20 minutes before removing from the pans
Place onto a cutting board and slice off the dome of the cake
Using a cake slicer, slice the two rounds in half. You should now have 4 rounds.