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Re: [T2TRG] [core] OCF Observe on special interfaces, design question, RFC requirements?

Michael Koster <michaeljohnkoster@gmail.com> Wed, 10 July 2019 06:10 UTC

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From: Michael Koster <michaeljohnkoster@gmail.com>
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Date: Tue, 09 Jul 2019 23:10:47 -0700
Cc: Klaus Hartke <hartke@projectcool.de>, Michael Koster <michael.koster=40smartthings.com@dmarc.ietf.org>, "t2trg@irtf.org" <t2trg@irtf.org>, core <core@ietf.org>
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References: <166B0435-8C96-4B83-98CB-A1D6F0838335@smartthings.com> <CAAzbHvYGVtNiw5taGMaVVRe4RuN9s2y4Y6RkJxR06Nk=w3CiTQ@mail.gmail.com> <683B27F7-F738-4B80-A27E-B65B75EFCDA6@tzi.org>
To: Carsten Bormann <cabo@tzi.org>
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Subject: Re: [T2TRG] [core] OCF Observe on special interfaces, design question, RFC requirements?
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Hi Carsten,

Yes, as is, this is not guaranteed to deliver all of the updates. 

Best regards,

Michael

PS We were thinking along similar lines as STP, with the idea of subscriber queues in Pub/Sub, where each subscriber would have its own queue and cursor. Of course, one could combine the storage for elements that are common across more than one subscriber, and recover storage for items that have been consumed by all subscribers.

> On Jul 9, 2019, at 10:52 PM, Carsten Bormann <cabo@tzi.org> wrote:
> 
> There is, of course, nothing wrong with observing a resource that is the “last change” of another resource.  This just doesn’t give you a reliable sequence of all changes; that requires something like the “Series Transfer Pattern”, https://tools.ietf.org/html/draft-bormann-t2trg-stp
> 
> Grüße, Carsten
> 
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