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https://issues.apache.org/jira/browse/PROTON-401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13812836#comment-13812836
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Ted Ross commented on PROTON-401:
---------------------------------

To put the proposal in the context of Rafi's scenario:

If the queue implementation invokes pn_link_offered on the outbound link prior 
to accepting the message on the inbound link, the strict semantics will be met.


> Ordering issue prevents credit drain from working properly
> ----------------------------------------------------------
>
>                 Key: PROTON-401
>                 URL: https://issues.apache.org/jira/browse/PROTON-401
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: proton-c
>    Affects Versions: 0.5
>            Reporter: Ken Giusti
>            Assignee: Ken Giusti
>             Fix For: 0.6
>
>         Attachments: drain-error.patch, drain-hack.patch
>
>
> If the sending link calls pn_link_drained() to indicate that it has send all 
> pending data, and afterwards it receives a Flow frame with drain=true from 
> the peer, then the drain never completes.
> The ordering is the problem: if the flow frame w/drain=true is received 
> _BEFORE_ the sender calls pn_link_drained(), then it works.



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