Re: [Netconf] LC on subscribed-notifications-10
"Eric Voit (evoit)" <evoit@cisco.com> Tue, 13 March 2018 13:44 UTC
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From: "Eric Voit (evoit)" <evoit@cisco.com>
To: "Robert Wilton -X (rwilton - ENSOFT LIMITED at Cisco)" <rwilton@cisco.com>, Kent Watsen <kwatsen@juniper.net>, "netconf@ietf.org" <netconf@ietf.org>, "draft-ietf-netconf-subscribed-notifications@ietf.org" <draft-ietf-netconf-subscribed-notifications@ietf.org>
Thread-Topic: [Netconf] LC on subscribed-notifications-10
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Date: Tue, 13 Mar 2018 13:44:09 +0000
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Subject: Re: [Netconf] LC on subscribed-notifications-10
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Hi Rob, Reducing to the open dialogs... > From: Robert Wilton, March 13, 2018 6:27 AM > >> 2. Intro: > >> - Should security be somewhere in the intro section? > > Do you see a particular need to emphasize security here? Not sure why there > should be a specific break-out here. > Only to make it clear that it has been considered, and the draft provides a > solution for it. Inserted "and access permissions" in the second sentence to make it: "Effectively this enables a "subscribe then publish" capability where the customized information needs and access permissions of each target receiver are understood by the publisher before subscribed event records are marshaled and pushed." > >> - Steam: Is this really a set, or a sequence. Perhaps ... "A > >> continuous chronologically ordered sequence of events ..."? If you > >> change this, then perhaps grep for usage of "set" in the draft to see > >> if they should be changed to sequence. > > I like the addition of "chronologically", put that word in. Regarding > "sequence": with "ordered" we likely have that covered sufficiently. Plus RFC- > 5277 used "set", so this is closer match to the original stream definition. > I still strongly prefer calling it a sequence, because I think that is what it is :-) > > I quickly looked up a couple of definitions of stream in computer science > literature and they all refer to them as sequences not sets. Is the steam being > referenced to this draft that same as what a normal software engineer would > think of as a stream? > > Is a stream ever allowed to contain duplicate values, e.g. on a replay it is > possible to put the same events into the stream? Event records are not be repeated on a subscription, even with replay. > If events are always unique > then set is fine, otherwise set just seems like the incorrect term. I really have no problem with "sequence". The only issue is that we had requests from the original authors of RFC-5277 to keep the stream definition as close to the original as feasible. If anyone else wants "sequence" and there are no objections, I am absolutely happy to convert. > >> 8 2.4. Dynamic subscriptions > >> > >> - Would writing "event streams" be better than "targets"? > > As dynamic subscriptions also apply to datastores (as augmented by yang- > push), it is better to leave the more general term. > OK, I think that I'm still struggling to create a good mental picture of how > everything fits together. > > I assumed that subscriptions only subscribe to event streams (e.g. from first > sentence in section 1). Hence, I was assuming that in the case of YANG push, > that the change notifications to a datastore would effectively be a new event > stream that could be subscribed to. Are you saying that it is something > else? This might need to be clarified somewhere. Actually what you were assuming was the original definition of "stream". I.e., it was how stream was first defined in 2014 in yang-push up until -v04 in 2016. But with the advent of NMDA, we wanted to adopt the definitions of "datastore" rather than create a mapping that forced the NMDA datastores to be associated 1:1 with stream names. More is described in yang-push. Note that In the yang module, target is a 'choice' statement with only a single case explored within subscribed-notifications. So detailing in this document what is expressed as an actual choice in yang-push seemed confusing. > > > >> - Diagram in 2.4.1, I found this diagram a bit tricky to read/interpret. One > >> particular question: Can you modify a subscription for a suspended receiver. > > There is a line from receiver suspended for this, so yes. > I think that I find it confusing as to what is an external event coming > from a subscriber or receiver vs internal state changes. > > OK, so I think that I have finally figured out what this diagram is > meant to be showing :-) > > Hence, I think that it might help to explicitly list the external events > below the diagram: > > - External events from a subscriber: establish-subscription, > modify-subscription, ... As each of these has its own section in the document, I am hesitant to add lots of verbal complexity to the diagram. If other people think this would be helpful, it certainly could and should be added. > - Internal states: start, receiver-ACTIVE, receiver-SUSPENDED, end. In the text above the diagram, I added the sentence "Each state is shown in its own box". Other text does describe the internal states. > >> - The text mentions the publisher rejecting a subscription, when can this > >> happen? > > Actually it says "any" not "a". The implication is that no other effects > anywhere based on a rejected subscription request. E.g., don't try to guess > which subscription to delete. > > > > But there is still a case for "a". What if a subscriber (with identical > credentials) established the referenced subscription on a different transport > session? The delete still should not work unless it comes on the original > transport. > The first sentence of that paragraph already states that it is on the > same transport session. My interpretation of the current text is that a > publisher can arbitrarily choose not to cancel a subscription. I think > that the text would be better if it was more explicit. > > E.g. perhaps replace: " If the publisher rejects the request, the > request has no impact whatsoever on any subscription. > > with something like: > > "If the delete request does not match a known subscription id of a > subscription established on the same transport session, then it MUST be > rejected with no changes to the system". Ok. Made it: If the delete request does not match a known subscription established on the same transport session, then it MUST be rejected with no changes to the publisher. Thanks, Eric > > Appreciated, Thanks Again! > > Eric > Thanks, > Rob
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] subscribed-notifications-12 Eric Voit (evoit)
- Re: [Netconf] subscribed-notifications-12 Martin Bjorklund
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Xufeng Liu
- Re: [Netconf] LC on subscribed-notifications-10 Jeff Tantsura
- Re: [Netconf] LC on subscribed-notifications-10 Tim Jenkins (timjenki)
- Re: [Netconf] LC on subscribed-notifications-10 Igor Bryskin
- Re: [Netconf] LC on subscribed-notifications-10 Qin Wu
- Re: [Netconf] LC on subscribed-notifications-10 Tianran Zhou
- Re: [Netconf] LC on subscribed-notifications-10 JEFERSON CAMPOS NOBRE
- Re: [Netconf] LC on subscribed-notifications-10 Henk Birkholz
- Re: [Netconf] LC on subscribed-notifications-10 Robert Wilton
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Robert Wilton
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Martin Bjorklund
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Martin Bjorklund
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Andy Bierman
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Qin Wu
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 r… Balazs Lengyel
- Re: [Netconf] LC on subscribed-notifications-10 Rohit R Ranade
- Re: [Netconf] LC on subscribed-notifications-10 Alexander Clemm
- Re: [Netconf] [SPAM?] RE: LC on subscribed-notifi… alex
- Re: [Netconf] [SPAM?] RE: LC on subscribed-notifi… Rohit R Ranade
- Re: [Netconf] [SPAM?] RE: LC on subscribed-notifi… Juergen Schoenwaelder
- Re: [Netconf] [SPAM?] RE: LC on subscribed-notifi… Randy Presuhn
- Re: [Netconf] [SPAM?] RE: LC on subscribed-notifi… Sterne, Jason (Nokia - CA/Ottawa)
- Re: [Netconf] LC on subscribed-notifications-10 r… Eric Voit (evoit)
- Re: [Netconf] [SPAM?] RE: LC on subscribed-notifi… Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 r… Martin Bjorklund
- Re: [Netconf] LC on subscribed-notifications-10 r… Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Alexander Clemm
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- [Netconf] subscribed-notifications-12 t.petch
- Re: [Netconf] subscribed-notifications-12 Eric Voit (evoit)
- Re: [Netconf] subscribed-notifications-12 t.petch
- Re: [Netconf] subscribed-notifications-12 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)
- Re: [Netconf] LC on subscribed-notifications-10 Kent Watsen
- Re: [Netconf] LC on subscribed-notifications-10 Eric Voit (evoit)