Re: [netconf] restconf collections
Kent Watsen <kent+ietf@watsen.net> Thu, 01 October 2020 13:32 UTC
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From: Kent Watsen <kent+ietf@watsen.net>
In-Reply-To: <20201001.152335.649983049956449669.id@4668.se>
Date: Thu, 01 Oct 2020 13:32:04 +0000
Cc: Qin Wu <bill.wu@huawei.com>, "netconf@ietf.org" <netconf@ietf.org>
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To: Martin Björklund <mbj+ietf@4668.se>
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Subject: Re: [netconf] restconf collections
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> 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. 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. >> >>
- 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