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https://issues.apache.org/jira/browse/QPID-4650?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chuck Rolke resolved QPID-4650.
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Resolution: Fixed
Fix Version/s: 0.23
Fixed at Committed revision 1485836.
> C++ Broker could use a rebind strategy to steer messages from one queue to
> other queue(s)
> -----------------------------------------------------------------------------------------
>
> Key: QPID-4650
> URL: https://issues.apache.org/jira/browse/QPID-4650
> Project: Qpid
> Issue Type: Improvement
> Components: C++ Broker
> Affects Versions: 0.20
> Reporter: Chuck Rolke
> Assignee: Chuck Rolke
> Fix For: 0.23
>
> Attachments: SlowConsumerRebind_v0.3.pdf,
> SlowConsumerRedirect_v1.0.pdf
>
>
> Use case:
> A C++ broker is providing a service to many customers. In some cases the
> broker is delivering high volumes of near real-time traffic to many clients.
> Occasionally a client stops accepting traffic and his delivery queue backs
> up. This puts the broker into a low memory situation and all users are
> affected.
> Solution:
> The organization that owns the broker could provide an "overflow backup
> service" that does several things:
> 1. Provides a local-to-the-broker, high-horsepower backup engine that sits
> waiting for consumers' queues to fill up.
> 2. When a consumer queue fills to some threshhold value then the backup
> engine inserts itself in the consumer's data path with a "rebind" command.
> 3. The consumer's traffic is now directed to a queue dedicated to the backup
> engine. The backup engine buffers the consumer data and plays it back into
> the original consumer queue as space becomes available.
> This feature could be approximated with no support from inside the broker but
> it could not be done without dropping or duplicating messages during the
> rebinding phase.
> With internal broker support the rebind operation could be cleanly executed
> and the producers and consumers would be unaware of any backup engine
> activity.
> A detailed use case is available in attached SlowConsumerRebind_v0.3.pdf
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