Re: [netconf] restconf collections
Hongwei Li <flycoolman@gmail.com> Fri, 02 October 2020 13:31 UTC
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From: Hongwei Li <flycoolman@gmail.com>
Date: Fri, 02 Oct 2020 09:31:22 -0400
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To: Kent Watsen <kent+ietf@watsen.net>
Cc: Martin Björklund <mbj+ietf@4668.se>, "netconf@ietf.org" <netconf@ietf.org>
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Subject: Re: [netconf] restconf collections
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Hi Kent, On Fri, Oct 2, 2020 at 9:07 AM Kent Watsen <kent+ietf@watsen.net> wrote: > > 3) Here we’re talking about querying a potentially large repository of > logs that are at rest, and full table scans should avoided. I suggest > that we’re dealing with something new here. > > > Perhaps we don't understand each other. Here's an pseudo-code example > of what I envision: > > GET /interfaces/interface > filter 'oper-status = "up" and statistics/in-errors > 0' > > This is XPath 1.0, applied to one instance at the time. > > > Of course I understand Xpath filters, other relevant examples here: > > - https://tools.ietf.org/html/rfc5277#section-5.2 > - https://tools.ietf.org/html/rfc8040#appendix-B.3.6 > > The point was/is that supporting full-Xpath for stream-filters is easy, or > rather doesn’t entail special consideration, as already each event is in > memory for an Xpath analysis. Thus, pointing to existing usage as evidence > that unconstrained Xpath can be used everywhere, including for potentially > very-large CF-lists, is not a given, as it would be performance-limiting to > bring every list-entry into application-level memory in order to use an > Xpath library. In this case, it is very much desired to push all the > querying logic to the DB-backend. > > > But when it comes to CF data, doing a full table scan is impractical > and index-backed queries can make the difference between the client > waiting seconds vs minutes. This is why I was initially trying to > focus on just solving the CF problem, where the pain is acute. > > > Well, it is less likely that an implementation uses a feature-rich (in > terms of query language) DB to store all its state, than its config. > So it would probably be easier to implement this using "an index" for > config than for config false... > > > Really? ...my experience is seems opposite. > > A number of server implementations I’m aware of persist the entire > configuration as a flat-file (e.g., pretty-print XML or JSON). They bring > it into memory and act on it using a feature-rich library (e.g., > Yangson). In my view, this approach hits the low-bar in terms of what > constitutes a “database”. > > On the flip side, handling large CF-lists (e.g., logs) is where servers > pretty much have to use a real database. An RDB (relational DB) is common, > but a TSDB (time-series DB) > <https://en.wikipedia.org/wiki/Time_series_database> is better suited. > [HL] A user case for time series data (e.g., logs), customers want to get > the data in between Time A and Time B. Do we use timestamp filter here? > > Perhaps we’re saying the same thing (yes, config APIs tends to have better > query expressions)…it might just be your last line regarding “index” that’s > throwing me (as clearly the DBs storing large CF-lists are having indexes). > > > That said, I propose we do “both”. <snip/> > > > I agree. > > > Okay, we’ll shoot for a two-pronged approach. > > > > Separately, for the RC-list draft only, the plan is to declare “list” and > “leaf-list” nodes (not their entries) as data resource targets. We only > need to do this for GET, but I assume that it's better to cover all the > HTTP operations - thoughts? > [HL] Data resources should not be bound to some specific operation. > Correct me, if my understanding is wrong. > > 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