Re: [netconf] restconf collections
Martin Björklund <mbj+ietf@4668.se> Thu, 01 October 2020 06:33 UTC
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Date: Thu, 01 Oct 2020 08:33:49 +0200
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To: kent+ietf@watsen.net
Cc: olof@hagsand.se, netconf@ietf.org
From: Martin Björklund <mbj+ietf@4668.se>
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Subject: Re: [netconf] restconf collections
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Hi, Kent Watsen <kent+ietf@watsen.net> wrote: > Hi Olaf, > > > I agree sorting is less important (than a,b,e). > > Noted. > > > > Is it not also somewhat beyond the present yang concepts where there > > is > > already ordered-by and key indices? > > Supplying a differing sorting could in effect require a different set > > of > > index(es) which could be quite costly in runtime for large data sets. > > If you want to sort differently, should it not be present in the > > underlying model, ie as declaring a secondary set of keys, for > > example, > > as an extension of the original yang model (thus being out of scope > > here)? > > A couple messages I sent yesterday alluded to defining an extension > statement that could be added to nodes in the YANG modules. > > Now I’m thinking that one-size doesn’t necessarily fit all, and > something like a server-specific “node-tag” would be more flexible. > (https://tools.ietf.org/html/draft-tao-netmod-yang-node-tags > <https://tools.ietf.org/html/draft-tao-netmod-yang-node-tags>) > > Maybe the answer is somewhere in-between, i.e., an extension that acts > like a “hint” and a node-tag indicating if the server delivered it. > Bad news w/ an extension is that legacy modules would need to be > revved or augmented. > > One thing, though, filtering on non-indexed nodes is guaranteed to > have slow performance, thus it seems that we need to enable indexing > for more than just a list’s keys. I disagree with both these statements. This is an implementation issue. > My conjecture is that, once we have the indexes for filtering (e), > they can be used for sorting (d). At least, that’s the way it works > with some DB-backends I’m familiar with... This is one implementation strategy. We should not design the standard around one implementation. > >>>> Yes, XPath is the “right answer”, but we need to ensure it’s > >>>> constrained enough to be mappable to common DB-backends. > > > > I would think a (strongly) constrained XPath would be a very nice > > solution. > > +1 > > > > To me reverse direction seems a subset of ordering/sorting? > > Indeed. In some DB-backends, “direction" is a sub-statement to the > “sort” statement. > > > > If sorting is less important, so would an alternate direction? > > Maybe, but an independent “direction" works with OBU-lists, which is > why I teased it out. > > And, besides, that assumes sorting is less important. I do hear a > consensus beginning to form in that direction, so we’ll see... > > All I know is that there are tons of UIs that enable column sorting > (e.g., an email client). Do we feel data models defined by YANG are > somehow immune to this? > > I hear folks expressing concern around sorting big data (e.g., logs), > which I grok, but what about for non-OBU CT lists (e.g., admins)? > Wouldn’t we like to sort by name, last-time-connected, etc.? Can not > supporting sorting on big data set be expressed via some combination > of extension + node-tag, or implicitly disabled if the pre-filter > fails to whittle the result set down to something that can be sorted > reasonably? I agree that this can be useful. But as has been pointed out earlier in this thread, sorting implies a stateful solution which will consume more resources and probably comes with some additional complexity. At Cisco/tail-f we implemented such a solution; a more generic "query" mechanism, for both NETCONF and RESTCONF. Perhaps Per A can share some details. /martin > > Unless there are some important use-cases, reverse order having the > > advantage of the same sorting mechanism/indexes, just in reverse (not > > introducing other keys, for example) > > Sorry, I didn’t parse that. Can you say another way? > > > K. >
- 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