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https://issues.apache.org/jira/browse/PROTON-401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13814034#comment-13814034
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Ted Ross commented on PROTON-401:
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If there is a way for the Engine user to determine the drain mode of a sender,
I believe I can solve my problem.
> 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: Rafael H. Schloming
> 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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