Re: [netmod] [Netconf] Retrieving Information Pointed by leafref
Robert Wilton <rwilton@cisco.com> Mon, 09 October 2017 14:46 UTC
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To: Xufeng Liu <xufeng.liu.ietf@gmail.com>, 'Igor Bryskin' <Igor.Bryskin@huawei.com>, per@tail-f.com
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From: Robert Wilton <rwilton@cisco.com>
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Date: Mon, 09 Oct 2017 15:46:04 +0100
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Subject: Re: [netmod] [Netconf] Retrieving Information Pointed by leafref
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I'm not sure that my XPath foo is good enough, but would NETCONF's XPath filter solve this problem? Thanks, Rob On 09/10/2017 14:42, Xufeng Liu wrote: > > Hi Per, > > *From:* Igor Bryskin [mailto:Igor.Bryskin@huawei.com] > *Sent:* Sunday, October 8, 2017 7:04 PM > *To:* Igor Bryskin <Igor.Bryskin@huawei.com>; per@tail-f.com; > xufeng.liu.ietf@gmail.com > *Cc:* netconf@ietf.org; netmod@ietf.org > *Subject:* Re: [Netconf] [netmod] Retrieving Information Pointed by > leafref > > > Hi Joel, > > Thanks, I think I didnt explain our problem correctly. > > In our case we have a leafref pointing to a te tunnel name, which > happens to be a key to lookup the (axilary) tunnel. We need a way to > include the entire tunnel body (not just a name) into the get > response. This is to optimize the number of iterations between the > client and the server. As Xufeng put it something similar to SQL join, > > Igor > > *From:*Igor Bryskin > > *To:*per@tail-f.com,xufeng.liu.ietf@gmail.com, > > *Cc:*netconf@ietf.org,netmod@ietf.org, > > *Date:*2017-10-08 17:36:47 > > *Subject:*Re: [Netconf] [netmod] Retrieving Information Pointed by leafref > > Hi Per, > > In a nutshell we would lika for a netconf client to have a way to > instruct the server on whether in response to the get request the > server needs to provide the entire body of a datastore node pointed to > by a leafref or just a pointer to said node, so that the node's body > could be retrieved by a subsequent separate request. This is requested > by implementors who want to optimise rhe number of interactions > between a client and its server. > > Cheers, > Igor > > *From:*Per Hedeland > > *To:*Xufeng Liu, > > *Cc:*netconf@ietf.org,'NetMod WG', > > *Date:*2017-10-08 14:01:27 > > *Subject:*Re: [Netconf] [netmod] Retrieving Information Pointed by leafref > > On 2017-10-06 23:11, Xufeng Liu wrote: > > During the design team discussion for TE and MPLS YANG modeling, we > have received a request from implementers: How to minimize the number > of NETCONF/RESTCONF RPCs to improve operation efficiency? > > Especially for the case when the operator or client software needs > to retrieve the object contents pointed by a leafref. > > > > For example, given the following simplified TE tunnel model, > > > > +--rw te > > > > +--rw explicit-paths > > > > | +--rw explicit-path* [name] > > > > | +--rw name string > > > > | +--rw explicit-route-object* [index] > > > > | +--rw index uint32 > > > > | +--rw explicit-route-usage? identityref > > > > +--rw tunnels > > > > | +--rw tunnel* [name] > > > > | | +--rw name string > > > > | | +--rw paths > > > > | | | +--rw path* [name] > > > > | | | +--rw explicit-path? -> > ../../../../../explicit-paths/explicit-path/name > > > > when the client tries to retrieve a tunnels information based on the > tunnel name, the get operation returns a list of leafrefs pointing to > the paths of the tunnel. > > Sorry, I'm afraid I don't follow. Can you explain exactly what your > "get" request is (protocol and payload), and where the "list of > leafref's" (whatever that may be) occurs in the reply? > > */[Xufeng] The “get” operation is the NETCONF/RESTCON <get> protocol > operation, or the <get-data> operation described in > https://tools.ietf.org/html/draft-dsdt-nmda-netconf-01 and the GET > operations on {+restconf}/ds/<datastore> described in > https://tools.ietf.org/html/draft-ietf-netconf-nmda-restconf-00./* > > *//* > > */We have a list of leafref values because in this example model, each > tunnel contains a list of paths, each of them contains a leafref. The > “get” returns a value for each instance of such a leafref, which (as a > string value) will be used as a constraint (foreign key) to retrieve > the instance of an explicit-path in the model above./* > > > > JFYI, in case there is some fundamental misunderstanding here: a leaf of > type leafref has a single value - *one* of those that satisfy the leafref > constraint, in case there are multiple "candidates". > > --Per > > > The client needs to issue at > > least one more get operation to retrieve the path information about > the given tunnel. The request is to combine these two operations into one. > > > > In the RDBMS SQL world, join can be used when SQL select is > performed, but NETCONF/YANG currently does not have this capability. > > > > Wed like to ask whether such a request is considered reasonable. > > > > If the request is reasonable, the next question is how to proceed. > This seems to be a protocol issue rather than YANG modeling issue. Is > it acceptable to add a new operation to achieve such a > > <get-data> operation with expanded leafrefs? > > > > Comments and suggestions are appreciated. > > > > Thanks, > > > > - Xufeng > > > > > > > > _______________________________________________ > > netmod mailing list > > netmod@ietf.org <mailto:netmod@ietf.org> > > https://www.ietf.org/mailman/listinfo/netmod > > > > _______________________________________________ > Netconf mailing list > Netconf@ietf.org <mailto:Netconf@ietf.org> > https://www.ietf.org/mailman/listinfo/netconf > > > > _______________________________________________ > netmod mailing list > netmod@ietf.org > https://www.ietf.org/mailman/listinfo/netmod
- [netmod] Retrieving Information Pointed by leafref Xufeng Liu
- Re: [netmod] Retrieving Information Pointed by le… Kent Watsen
- Re: [netmod] Retrieving Information Pointed by le… Kent Watsen
- Re: [netmod] Retrieving Information Pointed by le… Per Hedeland
- Re: [netmod] [Netconf] Retrieving Information Poi… Igor Bryskin
- Re: [netmod] [Netconf] Retrieving Information Poi… Igor Bryskin
- Re: [netmod] [Netconf] Retrieving Information Poi… Xufeng Liu
- Re: [netmod] [Netconf] Retrieving Information Poi… Robert Wilton
- Re: [netmod] [Netconf] Retrieving Information Poi… Per Hedeland
- Re: [netmod] [Netconf] Retrieving Information Poi… Igor Bryskin
- Re: [netmod] [Netconf] Retrieving Information Poi… Martin Bjorklund
- Re: [netmod] [Netconf] Retrieving Information Poi… Igor Bryskin
- Re: [netmod] [Netconf] Retrieving Information Poi… Per Hedeland
- Re: [netmod] [Netconf] Retrieving Information Poi… Igor Bryskin
- Re: [netmod] [Netconf] Retrieving Information Poi… Per Hedeland
- Re: [netmod] [Netconf] Retrieving Information Poi… Igor Bryskin
- Re: [netmod] [Netconf] Retrieving Information Poi… Per Hedeland
- Re: [netmod] [Netconf] Retrieving Information Poi… Robert Wilton
- Re: [netmod] [Netconf] Retrieving Information Poi… Igor Bryskin
- Re: [netmod] [Netconf] Retrieving Information Poi… t.petch
- Re: [netmod] [Netconf] Retrieving Information Poi… Robert Wilton
- Re: [netmod] [Netconf] Retrieving Information Poi… Xufeng Liu
- Re: [netmod] [Netconf] Retrieving Information Poi… Robert Wilton