Re: [netconf] restconf collections
Andy Bierman <andy@yumaworks.com> Thu, 01 October 2020 16:17 UTC
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From: Andy Bierman <andy@yumaworks.com>
Date: Thu, 01 Oct 2020 09:17:01 -0700
Message-ID: <CABCOCHTBk52yyGH5Y2CrGcbV3FqEh8_c4od6LnXQdjT9rigKgg@mail.gmail.com>
To: Martin Björklund <mbj+ietf@4668.se>
Cc: Kent Watsen <kent+ietf@watsen.net>, Netconf <netconf@ietf.org>
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Subject: Re: [netconf] restconf collections
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On Thu, Oct 1, 2020 at 7:57 AM Martin Björklund <mbj+ietf@4668.se> wrote: > Kent Watsen <kent+ietf@watsen.net> wrote: > > > > > > > On Oct 1, 2020, at 9:23 AM, Martin Björklund <mbj+ietf@4668.se> wrote: > > > > > > Kent Watsen <kent+ietf@watsen.net> wrote: > > >> Hi Qin, > > >> > > >>> Some opstate must be persisted, e.g., long-lived counters, logs, > etc., > > >>> but it’s a good point about other opstate not being persisted. > > >>> Perhaps “node-tags” can be used here, to differentiate which is > > >>> which…and servers can indicate if/how they support the ephemeral > > >>> opstate leafs in queries? > > >>> > > >>> [Qin]:That's a good case for node tag, in earlier discussion, we > > >>> discussed operation type, which distinguishs cumulative statistics > > >>> value from current value. The case discussed here is very close to > > >>> operation type proposal discussed earlier. > > >> > > >> Yes. Thank you for pointing that out. I meant to make the same > > >> observation before. Indeed, such node-tags could have dual-purpose: > > >> to guide a streaming-strategy and a querying-strategy for certain > > >> nodes. > > >> > > >> > > >>> Note sure how others feel about “direction: (c), but my primary > > >>> use-case revolves around time-series data (e.g., logs), where the > > >>> interest is commonly on the most-recent entries, so > > >>> "reverse-->offset—>limit” works nicely. > > >>> > > >>> Perhaps an alternative would be to lift a concept from Python with > > >>> negative indexes so, for instance, offset=-N and limit=-N gives the > > >>> last N entries? > > >>> [Qin]: Yes, that's what I thought as well, with negative indexes, (b) > > >>> and (c) seems to me, can be combined. > > >> > > >> Can others comment on this? > > > > > > Isn't this just another syntax for the same function? > > > > No, it is not. > > How so? Isn't the idea that you can first ask for offset=-10, then > -20, etc, essentially walking the list backwards? (I don't understand > what a negative limit means though). > > Can somebody explain the use-case for iterating a list backwards? No customer has ever asked for this so I am wondering what we are all missing. I guess it isn't clear that offsets do not work for lists where entries are added and/or deleted over time, unless lots of state is kept by the server. I guess if you are looking for the most expensive heavyweight solution possible then this is a good start. > > /martin > Andy > > > > > > K. > > > > > > > > > > /martin > > > > > > > > >> Presumably, we could eliminate “direction” (c) with this approach. > > >> > > >> Without “direction”, I think that UIs can still support the ability to > > >> do column-sorts, whereby the user clicks on a column’s header to > > >> toggle ascending vs. descending presentation, but they’ll have to do > > >> it client-side. > > >> > > >> That is, if wanting to see the 2nd page of results sorted by a column, > > >> something like: > > >> > > >> sort(column-name) --> offset(-2*pagesize) --> limit(pagesize) > > >> > > >> Followed by the client then flipping the results to present the > > >> results in the user-selected order, right? > > >> > > >> That said, given that DB-backends that support sorts commonly also > > >> support direction, it's unclear what this buys us. > > >> > > >> > > >>>>> Sure, but I wonder if, e.g., a netmask filter, is supportable by > > >>>>> common DB-backends. I’m hoping we have some DB-experts on the > list! > > >>>> > > >>>> See above. It can be quite efficient even if the backend doesn't > > >>>> support it. > > >>> > > >>> I don’t see that above, but I don’t doubt that it can be so, it’s > just > > >>> a whole lot of implementation complexity. It seems that we > > >>> should/must support servers doing it, we just need to find a way > > >>> (node-tags?) to enable them to express that ability. > > >>> [Qin]: My feeling is this efficiency more depends on the amount of > > >>> data we need to request. If amount of data we request is huge, maybe, > > >>> client-> server-> backend may be the better choice. > > >> > > >> Is it the amount of data requested or the number of entries in the > > >> list? At least, in my worldview, clients are always requesting a > > >> “page” of data, so that part is rather consistently small. > > >> > > >> If the intention is to get a complete dump, then maybe the comment > > >> from yesterday applies, whereby streaming to an external repository > > >> that can be queried offline makes more sense? - especially > > >> considering that the number of on-box logs is likely to be only the > > >> most recent (e.g., days), whereas the complete-dump type queries > > >> likely wish to extend well-past that. > > >> > > >> K. > > >> > > >> > > > _______________________________________________ > netconf mailing list > netconf@ietf.org > https://www.ietf.org/mailman/listinfo/netconf >
- Re: [netconf] restconf collections Kent Watsen
- [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Per Andersson (perander)
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Andy Bierman
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Andy Bierman
- Re: [netconf] restconf collections Qin Wu
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Andy Bierman
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Andy Bierman
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Martin Björklund
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Robert Varga
- Re: [netconf] restconf collections Robert Varga
- Re: [netconf] restconf collections Qin Wu
- Re: [netconf] restconf collections Qin Wu
- Re: [netconf] restconf collections Qin Wu
- Re: [netconf] restconf collections Martin Björklund
- Re: [netconf] restconf collections Robert Varga
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Olof Hagsand
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Robert Varga
- Re: [netconf] restconf collections Hongwei Li
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Qin Wu
- Re: [netconf] restconf collections Martin Björklund
- Re: [netconf] restconf collections Martin Björklund
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Martin Björklund
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Martin Björklund
- Re: [netconf] restconf collections Martin Björklund
- Re: [netconf] restconf collections Andy Bierman
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Martin Björklund
- Re: [netconf] restconf collections Qin Wu
- Re: [netconf] restconf collections Qin Wu
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Hongwei Li
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Hongwei Li
- Re: [netconf] restconf collections Martin Björklund
- Re: [netconf] restconf collections Kent Watsen
- Re: [netconf] restconf collections Martin Björklund
- Re: [netconf] restconf collections Andy Bierman