[jira] [Created] (QPID-5466) Dispatch - Add different forwarding semantics for addresses

["Ted Ross (JIRA)" <ji...@apache.org>]

Ted Ross created QPID-5466:
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             Summary: Dispatch - Add different forwarding semantics for addresses
                 Key: QPID-5466
                 URL: https://issues.apache.org/jira/browse/QPID-5466
             Project: Qpid
          Issue Type: Improvement
          Components: Qpid Dispatch
            Reporter: Ted Ross
            Assignee: Ted Ross


(For version 0.2)

At present, if there are multiple receivers for a particular address, Dispatch delivers a copy of each message to all of the receivers.  This feature adds the ability to by-configuration deliver messages to only one of those receivers.

The configuration for this feature is per-address and defines two settings:
 - _fanout_ is either Multiple or Single (and a placeholder for Group).  Multiple fanout means all subscribers receive each message.  Single fanout means that only one subscriber receives the message.
- _bias_ controls how single-fanout is treated.  The following values for bias are provided:
   - Closest - each message is delivered to the closest/least-cost subscriber.
   - Spread - messages are spread indeterminately across all subscribers.
   - Latency - (not implemented yet) Messages are delivered in a balanced way to all subscribers based on the latency of acknowledgements.  This mode attempts to keep all subscribers equally fed with incoming messages.



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