CONGA: distributed congestion-aware load balancing for datacenters. - Mohammad Alizadeh; Tom Edsall; Sarang Dharmapurikar; Ramanan Vaidyanathan; Kevin Chu; Andy Fingerhut; Vinh The Lam; Francis Matus; Rong Pan; Navindra Yadav; George Varghese (SIGCOMM, 2014)