[Pulp-list] Messaging Questions

[Jeff Ortel]

On 07/08/2010 04:06 PM, Jason Dobies wrote:
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>> Open questions which I see:
>>
>> 1) Does pulp require durable queues? Do I want to ensure that a packge
>> is updated the next time it wakes up? If so, we need to handle queue
>> purging. Perhaps this is tied to consumer deletion.
>>
>> 2) Can the same message (install package) be sent P2P Sync, Fire and
>> Forget, and broadcast. I think the answer to this should be yes. If so,
>> in broadcast, is there a notion of the success/failure?
>
> 1 and 2 are kinda related, so I'll answer both here.
>
> This is a really interesting question. If a user says to install a
> package and the agent isn't currently available, will the user still
> want it installed in the future when it is available?
>
> I think if we add a time factor to the request (i.e. "only do this if
> you get the message before 8am") I'm more inclined to go with only using
> durable queues for package installs. It feels like too critical of an
> operation to leave open to a non-guaranteed paradigm.

Agreed.  Asynchronous requests that are time sensitive (like maintenance windows) need to 
be discarded (with response when appropriate) by the agent when the time criteria cannot 
be met.

>
>> 3) Will Jason Dobies choose to argue against himself who is arguing
>> against himself? if so, is he correct no matter what the outcome?
>
> I'm glad you came to the realization that I'm always correct. :)
>
>> 4) Is there a hearbeat requirement? I have not heard of any.
>
> It's starting to sound like there is. If we go durable queues, this is
> gonna be the way we clean up queues for dead agents. Even if there
> isn't, I think it's a trivial enough addition to give us minimalistic
> availability information. Good bang for the buck there.
>
>> -- bk
>
>
> - --
> Jason Dobies
> RHCE# 805008743336126
> Freenode: jdob
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