Software for a distributed streaming platform receives a data stream for an application running on a distributed streaming platform over a networked cluster of servers. The hook devices are configured to be disposed between and engage adjacent vertebral bodies. The at least one protrusion is disposed inside a cooling fluid manifold to reduce the flow amount of the cooling fluid which flows in and out between the separating plates through the cooling fluid manifold. The cylindrical piece extends over the barrel of the motor and is secured to the barrel with a plurality of screws. A washing machine includes a bearing housing having a flange part and a tub injection-molded with the bearing housing inserted into a wall thereof, the wall having a recessing part and a projecting part formed on an inner or an outer surface thereof along a circumferential direction, and a circumferential rib or a radial rib formed on the recessing part.