Re: [netmod] 答复: FW: a question about ietf-hardware yang module
Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Fri, 28 June 2019 08:07 UTC
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Date: Fri, 28 Jun 2019 10:07:13 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Martin Bjorklund <mbj@tail-f.com>
CC: frank.fengchong@huawei.com, andy@yumaworks.com, netmod@ietf.org
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/d6h7rgHS8bYohQpnb86MIkeEymg>
Subject: Re: [netmod] 答复: FW: a question about ietf-hardware yang module
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On Fri, Jun 28, 2019 at 09:52:20AM +0200, Martin Bjorklund wrote: > Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> wrote: > > On Thu, Jun 27, 2019 at 10:04:50PM +0200, Martin Bjorklund wrote: > > > Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> wrote: > > > > On Thu, Jun 27, 2019 at 09:52:56PM +0200, Martin Bjorklund wrote: > > > > > > Yes, good point, I think the phrase "by a different hardware > > > > > > component" should be removed. It seems last-change should change when > > > > > > I unplug a component and I plug it back shortly after, i.e., a > > > > > > component is replaced by itself. So we have: > > > > > > > > > > > > "The last time a new hardware component has been added to the > > > > > > '/hardware/component' list, or a hardware component has been > > > > > > removed from the '/hardware/component' list, or a hardware > > > > > > component in the '/hardware/component' list has been > > > > > > replaced." > > > > > > > > > > I think that this is still not clear what it means that a component > > > > > has been replaced. Do you mean "replaced by a different hardware > > > > > component"? > > > > > > > > > > Otherwise (unplug then plug in the same component), the system either > > > > > detects the removal and thus updates last-change, or it doesn't detect > > > > > the quick removal/insertion, and then it can't do anything. Thus, I > > > > > don't think this case needs special treatment, and the text could be > > > > > just: > > > > > > > > > > "The last time a new hardware component has been added to the > > > > > '/hardware/component' list, or a hardware component has been > > > > > removed from the '/hardware/component' list." > > > > > > > > > > > > > The question is whether every implementor will figure out that if the > > > > component found in some slot x-y-z is different from what is expected > > > > to be in slot x-y-z, this must be seen as a remove + add combination. > > > > If we include 'replace', then it may be clearer that even in the case > > > > where what is in slot x-y-z has changed, the last-change must be > > > > updated. (That is, the list element with the same name still exists > > > > but it is different from what was there before with the same name.) > > > > > > But then we're back to where we started - what exactly does "different > > > from what was there before" mean? Presumably that some leaf's value > > > is different...? > > > > > > > Go back some emails, I have removed the 'different' phrase. > > Perhaps we can say: > > [...] or a hardware > component in the '/hardware/component' list has been > replaced with a new hardware component with the same > name. > Do we want last-change to be updated when a component gets unplugged and put back, i.e., a component got replaced with itself? Can last-change be used to detect that something messed around with the components (or a component is connected via a bad line)? Or is last-change more strictly for the set of components has changed? If I remove a component and I put it back slowly enough, I might get two last-change updates (the removal and the addition). If a client polls even more slowly, it will see that last-change has changed but it will find the same components. Hence, it seems reasonable to not exclude a replacement or a component with itself since it is a matter of the time resolution with which changes are detected and reported via the operational datastore. /js -- Juergen Schoenwaelder Jacobs University Bremen gGmbH Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany Fax: +49 421 200 3103 <https://www.jacobs-university.de/>
- [netmod] a question about ietf-hardware yang modu… Fengchong (frank)
- [netmod] FW: a question about ietf-hardware yang … Fengchong (frank)
- Re: [netmod] FW: a question about ietf-hardware y… Andy Bierman
- Re: [netmod] FW: a question about ietf-hardware y… Juergen Schoenwaelder
- Re: [netmod] FW: a question about ietf-hardware y… Martin Bjorklund
- Re: [netmod] FW: a question about ietf-hardware y… Juergen Schoenwaelder
- Re: [netmod] FW: a question about ietf-hardware y… Martin Bjorklund
- [netmod] 答复: FW: a question about ietf-hardware y… Fengchong (frank)
- Re: [netmod] 答复: FW: a question about ietf-hardwa… Juergen Schoenwaelder
- Re: [netmod] 答复: FW: a question about ietf-hardwa… Martin Bjorklund
- Re: [netmod] 答复: FW: a question about ietf-hardwa… Juergen Schoenwaelder
- Re: [netmod] 答复: FW: a question about ietf-hardwa… Martin Bjorklund
- Re: [netmod] 答复: FW: a question about ietf-hardwa… Juergen Schoenwaelder
- Re: [netmod] 答复: FW: a question about ietf-hardwa… Martin Bjorklund
- Re: [netmod] 答复: FW: a question about ietf-hardwa… Juergen Schoenwaelder
- Re: [netmod] 答复: FW: a question about ietf-hardwa… Martin Bjorklund
- Re: [netmod] 答复: FW: a question about ietf-hardwa… Juergen Schoenwaelder
- Re: [netmod] 答复: FW: a question about ietf-hardwa… Martin Bjorklund
- Re: [netmod] 答复: FW: a question about ietf-hardwa… Juergen Schoenwaelder