A system and method can a scalable message bus in a distributed data grid. The system can provide a plurality of message buses in the distributed data grid, wherein the distributed data grid includes a plurality of cluster members and provides a plurality of services. Furthermore, the system can associate each said service in the distributed data grid with a said message bus, and use the plurality of message buses to support data transferring between different services on different cluster members in the distributed data grid. Additionally, the system can use a datagram layer to support clustering in the distributed data grid, and bypass the datagram layer in the distributed data grid for data transferring.