Hewlett-packard Development Company, L.P.

Fred B Worley

Michael R Krause

Shankar Iyer

Kimberly K Scott

A method includes producing units of work with at least one source application instance (AI) at a source device and consuming units of work with at least one destination AI at a destination device. A first reliable datagram service is established, with a first source and destination resource (SDR), between the source device and the destination device. A second reliable datagram service is established, with a second SDR independent of the first SDR, between the source device and the destination device. A first unit of work stream is transmitted over a communication services/fabric with the first reliable datagram service, which guarantees strong ordering of the first unit of work stream received at the destination device. A second unit of work stream is transmitted over the communication services/fabric with the second reliable datagram service, which guarantees strong ordering of the second unit of work stream received at the destination device.

Reliable datagram via independent source destination resources

A reliable multicast service is operated between a source device and multiple destination devices participating in a multicast group. The source device includes a first source application instance (AI) producing a first unit of work stream, and communication services (CS). Each destination device in the multicast group includes CS, and at least one destination AI which consumes units of work. Communication services/fabric provide communication between the source device and the multiple destination devices. Multiple source and destination resources (SDRs) implement corresponding multiple reliable transport services between the source device and corresponding multiple destination devices in the multicast group for delivery of the first unit of work stream to the corresponding destination devices and guaranteeing strong ordering of the first unit of work stream received at the corresponding destination devices.

Reliable multicast

A reliable datagram service is implemented with a source and destination resource (SDR). Source SDR resources, at a source device, multiplex units of work produced by at least one source application instance (AI) into a serial unit of work stream having units of work in a defined order and transmit the serial unit of work stream over a communication services/fabric. Destination SDR resources, at a destination device, receive the serial unit of work stream, demultiplex the serial unit of work stream into units of work provided to at least one destination AI, and provide a negative acknowledgement (NAK) for a unit of work received ahead of its defined order.

Reliable datagram

The present invention relates to highly available sequence number generation with minimal latency. The present invention involves establishing a primary and secondary sequence number generators. A sequence number request is forwarded to the primary generator. The primary generator determines the next sequence number and forwards the response to the secondary generator. The secondary generator stores the value and forwards the value to the originating entity. Accordingly, the configuration avoids single point failure and is robust against malfunction.

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Santa Clara, CA, United States of America

Fred B Worley