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Posted to dev@qpid.apache.org by "Robbie Gemmell (JIRA)" <ji...@apache.org> on 2018/10/04 16:15:00 UTC
[jira] [Commented] (PROTON-1949) no message header if priority ==
default
[ https://issues.apache.org/jira/browse/PROTON-1949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16638452#comment-16638452 ]
Robbie Gemmell commented on PROTON-1949:
----------------------------------------
I don't think your desire really works. Messages with no header do still have a priority, 4. The spec is clear that its semantically the same whether the header is sent or not, or the value is populated or not. I don't think you can reasonably treat the field/value's presence or not as definitely indicating it 'had one assigned' when that value is 4. For example, to complicate matters, I think perhaps in the past proton-c actually sent the value 4 if you included a header but hadn't explicitly set the priority to 4.
(The JMS client also omits a header when it can, as its a waste of bytes and work done encoding/decoding it)
> no message header if priority == default
> ----------------------------------------
>
> Key: PROTON-1949
> URL: https://issues.apache.org/jira/browse/PROTON-1949
> Project: Qpid Proton
> Issue Type: Bug
> Reporter: michael goulish
> Priority: Major
>
> Proton does not send a message header if there would be nothing in it but the priority field, and if the priority was set to the default value (4).
> At the router level, we are allowing the user to set priorities on addresses. Those priorities will be given to any message sent to that address if the message otherwise had no priority set.
> So - we need to be able to distinguish between messages that were assigned the default priority, and messages in which the priority was left undefined.
> We would like proton to send the priority field in the message header if the user sets any priority. Then we will be able to interpret no header, or no priority field in the header as "no priority was assigned".
>
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