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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PROTON-1512) Expose the "aborted" flag for transferred deliveries
Date Thu, 21 Sep 2017 19:31:03 GMT

    [ https://issues.apache.org/jira/browse/PROTON-1512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16175320#comment-16175320
] 

ASF subversion and git services commented on PROTON-1512:
---------------------------------------------------------

Commit 5c99849941f6c553a1080995936696ff56e3e4a9 in qpid-proton's branch refs/heads/master
from [~aconway]
[ https://git-wip-us.apache.org/repos/asf?p=qpid-proton.git;h=5c99849 ]

PROTON-1512: c examples use recommended PN_DELIVERY pattern

Fixed the C examples to use the recommended pattern of always reading data
on a PN_DELIVERY event. Letting data accumulate in proton can cause a hang
if a message is larger than the session flow-control limit.


> Expose the "aborted" flag for transferred deliveries
> ----------------------------------------------------
>
>                 Key: PROTON-1512
>                 URL: https://issues.apache.org/jira/browse/PROTON-1512
>             Project: Qpid Proton
>          Issue Type: New Feature
>          Components: proton-c
>            Reporter: Ted Ross
>            Assignee: Alan Conway
>              Labels: api
>             Fix For: proton-c-0.18.0
>
>
> As we develop support for message streaming in Qpid Dispatch Router (i.e. frames for
large multi-frame messages are forwarded to destinations as they arrive, before the complete
message is received), there is a need to handle the case where a received message is never
completed.
> The AMQP protocol has a provision for this in the "aborted" flag in the transfer performative.
 If the router is in the process of streaming a large message from sender to receiver and
the sender drops before completing the delivery, the router can send a transfer to the downstream
receivers with the "aborted" flag set.  This would indicate that the message should not be
processed and would not cause any framing errors on the link.
> Proton does not currently expose this capability in its API (There is a pn_link_abort
in the C header file, but it is commented out and not implemented).
> In order to properly handle the failure cases for message streaming, this feature must
be usable in Proton.



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