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Posted to dev@qpid.apache.org by "Alan Conway (JIRA)" <ji...@apache.org> on 2017/10/03 14:34:00 UTC
[jira] [Commented] (PROTON-1512) Expose the "aborted" flag for
transferred deliveries
[ https://issues.apache.org/jira/browse/PROTON-1512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16189771#comment-16189771 ]
Alan Conway commented on PROTON-1512:
-------------------------------------
The final, final missing piece: how to account for credit in the presence of aborted messages. See
http://qpid.2158936.n2.nabble.com/AMQP-spec-question-aborted-messages-and-credit-td7667485.html
> 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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