Publish and subscribe data processing with subscriber option to request subscription propagation prior to acknowledgment

摘要

In a publish/subscribe data processing broker network having a plurality of broker data processing apparatuses each of which has an input for receiving published messages directly from a publisher application and/or receiving subscription data from a subscriber application, a first broker apparatus 111 has: a software unit for receiving subscription data from a subscriber application 301; a software unit for providing an acknowledgement to the subscriber application to acknowledge that the subscription data has been received; a software unit for propagating the subscription data to a group of other broker apparatuses; a software unit for determining whether the means for propagating has propagated the subscription data to the group of other broker apparatuses; and a software unit for receiving an indication from the subscriber application that the acknowledgement should not be sent to the subscriber application until the means for determining has determined that the means for propagating has propagated the subscription data to the group of other broker apparatuses.