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https://issues.apache.org/jira/browse/PROTON-796?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justin Ross updated PROTON-796:
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Fix Version/s: Future
> support reducing credit [as a means to stop a link without drain]
> -----------------------------------------------------------------
>
> Key: PROTON-796
> URL: https://issues.apache.org/jira/browse/PROTON-796
> Project: Qpid Proton
> Issue Type: Improvement
> Components: proton-c, proton-j
> Reporter: Robbie Gemmell
> Fix For: Future
>
>
> It would be useful if there was full support for reducing crdit on a link,
> perhaps even to 0 as a means of stopping it.
> Currently the way to stop a link [and determine that it has actually stopped]
> would be to issue a 'drain' flow request and then handle either a flow
> response or arriving messages resulting in credit reaching 0.
> Using drain in this way effectively acts as request for any more messages to
> be sent by the peer using remaining credit if it already could have but had
> yet to do so. In contrast, the peer wishing to stop the link might prefer
> those messages actually not be sent, as it is indicating it doesnt want those
> messages currently. This could be possible by reducing credit on the link to
> 0, and requesting the updated state be echo'd as shown at [1], though this
> would require PROTON-795 be resolved.
> It may currently be possible to fiddle with credit and drain handling (e.g
> 'adding or 'drain'ing negative credit) to simulate this currently, however it
> isnt clear that the resulting behaviour would be desirable, given the impact
> of any message already in-flight from the peer before it receives the
> credit-reducing flow which might lead to situations like negative-credit.
> [1]
> http://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-transport-v1.0-os.html#doc-idp429232
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