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https://issues.apache.org/jira/browse/PROTON-350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ken Giusti updated PROTON-350:
------------------------------

    Attachment: test-recv.py

Run test-recv.py and send messages to it.  The number of messages queued 
internally by test-recv.py will grow indefinitely.  Stop the test, and modify 
test-recv.py to call messenger.rcv( 10 ), and re-run: the number of queued 
messages will block at 10.
                
> Messenger - pn_messenger_recv( -1 ) does not flow control senders
> -----------------------------------------------------------------
>
>                 Key: PROTON-350
>                 URL: https://issues.apache.org/jira/browse/PROTON-350
>             Project: Qpid Proton
>          Issue Type: Bug
>          Components: proton-c
>    Affects Versions: 0.4
>            Reporter: Ken Giusti
>             Fix For: 0.5
>
>         Attachments: test-recv.py
>
>
> When using pn_messenger_recv( -1 ), remote senders are not back-pressured, 
> and the number of messages received can grow without bounds.  It appears that 
> messenger is unconditionally granting credit as messages arrive.
> Messenger should instead only replenish credit when received messages are 
> actually consumed by the application (maybe after they are settled?).

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