Scalable Reliable Multicast Protocols that reduce processing requirements on receivers and senders have been the subject of much research in recent years. In [12] and [6] we propose a new protocol that groups receivers for error recovery into fixed-size groups, thus reducing their processing requirement to O(1). We expand on this work by applying the concept of Local Recovery to receiver groups, which further improves the processing requirements on the sender while maintaining a constant O(1) requirement on the receivers. Furthermore, we extrapolate the concept of receiver grouping to repair servers resulting in further reduction in the sender's processing requirements. The processing requirements on both the sender and the receiver for both cases are analytically studied.
