• Credit-based flow control (CFC) is a link-by-link, per virtual channel congestion control technique used in ATM network switches. • To exchange data through an ATM network, each pair of endpoints Vasiliki Kalavri | Boston University 2020 28 Credit-based flow control • This classic networking technique turns out to be very useful for load management in modern, highly-parallel stream processors and

it receives a positive ack • the system ensures retrying even if the sender crashes • this technique guarantees at-least-once delivery RPC retries might create duplicates • RPCs can sometimes succeed