Re: [CDNi] CDNI Metadata Interface
HeXiaoyan <hexiaoyan@huawei.com> Fri, 14 October 2011 09:36 UTC
Return-Path: <hexiaoyan@huawei.com>
X-Original-To: cdni@ietfa.amsl.com
Delivered-To: cdni@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 71C9321F8487 for <cdni@ietfa.amsl.com>; Fri, 14 Oct 2011 02:36:00 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.599
X-Spam-Level:
X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PhXvckLB+E4B for <cdni@ietfa.amsl.com>; Fri, 14 Oct 2011 02:35:56 -0700 (PDT)
Received: from szxga04-in.huawei.com (szxga04-in.huawei.com [119.145.14.67]) by ietfa.amsl.com (Postfix) with ESMTP id 02F7021F847D for <cdni@ietf.org>; Fri, 14 Oct 2011 02:35:56 -0700 (PDT)
Received: from huawei.com (szxga04-in [172.24.2.12]) by szxga04-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0LT100F3WUMZTX@szxga04-in.huawei.com> for cdni@ietf.org; Fri, 14 Oct 2011 17:35:23 +0800 (CST)
Received: from szxrg01-dlp.huawei.com ([172.24.2.119]) by szxga04-in.huawei.com (iPlanet Messaging Server 5.2 HotFix 2.14 (built Aug 8 2006)) with ESMTP id <0LT100AITUMITG@szxga04-in.huawei.com> for cdni@ietf.org; Fri, 14 Oct 2011 17:35:23 +0800 (CST)
Received: from szxeml208-edg.china.huawei.com ([172.24.2.119]) by szxrg01-dlp.huawei.com (MOS 4.1.9-GA) with ESMTP id AEL53273; Fri, 14 Oct 2011 17:35:22 +0800
Received: from SZXEML412-HUB.china.huawei.com (10.82.67.91) by szxeml208-edg.china.huawei.com (172.24.2.60) with Microsoft SMTP Server (TLS) id 14.1.270.1; Fri, 14 Oct 2011 17:35:15 +0800
Received: from w36710x (10.144.242.117) by smtpscn.huawei.com (10.82.67.91) with Microsoft SMTP Server (TLS) id 14.1.270.1; Fri, 14 Oct 2011 17:35:12 +0800
Date: Fri, 14 Oct 2011 17:35:10 +0800
From: HeXiaoyan <hexiaoyan@huawei.com>
In-reply-to: <291CC3F9E50E7641901A54E85D0977C651B51517AD@MAILR002.mail.lan>
X-Originating-IP: [10.144.242.117]
To: 'Kevin J Ma' <kevin.ma@azukisystems.com>, cdni@ietf.org
Message-id: <000501cc8a54$921298c0$b637ca40$@com>
MIME-version: 1.0
X-Mailer: Microsoft Office Outlook 12.0
Content-type: text/plain; charset="us-ascii"
Content-language: zh-cn
Content-transfer-encoding: 7bit
Thread-index: AcyErDmDceDqNX+AQtKwjumpTmgL9wDNgegQABC/ZGAAiOeZgA==
X-CFilter-Loop: Reflected
References: <291CC3F9E50E7641901A54E85D0977C651B50AF9D2@MAILR002.mail.lan> <010d01cc87f8$10bc5940$32350bc0$@com> <291CC3F9E50E7641901A54E85D0977C651B51517AD@MAILR002.mail.lan>
Subject: Re: [CDNi] CDNI Metadata Interface
X-BeenThere: cdni@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: "This list is to discuss issues associated with the Interconnection of Content Delivery Networks \(CDNs\)" <cdni.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/cdni>, <mailto:cdni-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/cdni>
List-Post: <mailto:cdni@ietf.org>
List-Help: <mailto:cdni-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/cdni>, <mailto:cdni-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 14 Oct 2011 09:36:00 -0000
Hi Kevin, Thanks for the response. Some further concern, - I don't quite understand the restriction that require metadata of all hostnames in one Domain have same value. The case exist that for a specific metadata different hostnames often have different value. Compare with creating multiple Domains with less hostname sharing the same metadata, I think link metadata to hostname not Domain is more simpler. -I interpret the role of the Agent object is to identify entities communicated (correct me if I'm wrong), other interfaces in CDNI e.g. Logging interface needs such an parameter as well, a universal solution for that would be good, do you think the Agent object introduced in your draft could also be applicable for other interfaces? Best Regards Xiaoyan(Susan) He -----Original Message----- From: Kevin J Ma [mailto:kevin.ma@azukisystems.com] Sent: Tuesday, October 11, 2011 11:30 PM To: HeXiaoyan; cdni@ietf.org Subject: RE: [CDNi] CDNI Metadata Interface Hi Susan, thanx for the comments, responses inline: > -----Original Message----- > From: HeXiaoyan [mailto:hexiaoyan@huawei.com] > Sent: Tuesday, October 11, 2011 5:28 AM > To: Kevin J Ma; cdni@ietf.org > Subject: RE: [CDNi] CDNI Metadata Interface > > Hi Kevin, > Some quick questions and comments on this draft, > >The Metadata objects are each associated with a URI within the Domain and > accessible through any of the Hostnames... > - Could you further explain or give an example how a metadata is accessed > by > a Hostname within the Domain? And a further question is how the data model > works if a metadata is only associated with a specific Hostname within one > Doman? I was assuming that metadata would be valid for all hostnames. If a hostname needed separate metadata, a new domain would be required. I was thinking of hostname as a first level restriction. My implementation does something along the lines of the following (where hostname is checked before metadata lookup): domain = get_param_from_query_string(getenv("QUERY_STRING"), "domain") if (!db_verify_hostname_for_domain(getenv("SERVER_NAME"), domain)) return error metadata = db_get_metadata_by_uri_domain_agent(getenv("REQUEST_URI"), domain, getenv("REMOTE_USER")) xml = generate_xml_for_metadata(metadata) return xml > - The relationship between Agent objects and Metadata objects is a > one-to-one relationship, does this mean one agent can only access one > Metadata within one Domain? That is a typo in the doc, good catch, thanx! It should be one to many. Each metadata must be associated with a single agent, but an agent can be associated with multiple metadata. Agent-1 could have metadatas A, B, and C, while agent-2 could have a separate value for metadatas A and B, and also have its own metadata D (that agent-1 does not have access to) > > The association of each Metadata to an Agent allows different Agents to > retrieve different Metadata values for a given URI in the given Domain. > - Don't understand why each Metadata object needs to be bind with an Agent > explicitly, IMO, whether to return different value to different Agents is > an > inside process of the upCDN, what downCDN needs to do is just transmit its > identifier to the upCDN when retrieve a Metadata. I think the fact that a uCDN would want/need to give out different values to different dCDNs requires that there be a way to represent and store that information. Having it explicitly in the model, i think, simplifies the implementation and guarantees that all implementation give this issue proper consideration. > - Which entity is responsible for creating the Agent objects within one > Domain? Does the CP can 'see' the downCDNs and creates corresponding Agent > objects and other CDNs on the way just transmitted it or each upCDN > located > in the cascaded path creates a Agent object for each its downCDN? This is a good question. Different agents would need to be create by different entities, as you mention. I would expect each CDN to create agents to represent those (outside that CDN) who need access to the metadata interface. thanx! -- Kevin J. Ma > Thanks. > Best Regards > Xiaoyan(Susan) He > > -----Original Message----- > From: cdni-bounces@ietf.org [mailto:cdni-bounces@ietf.org] On Behalf Of > Kevin J Ma > Sent: Friday, October 07, 2011 1:21 PM > To: cdni@ietf.org > Subject: [CDNi] CDNI Metadata Interface > > Hi all, > > Just uploaded a new I-D with a proposed metadata model and API: > > http://www.ietf.org/internet-drafts/draft-ma-cdni-metadata-00.txt > > The model takes a rather generic approach to metadata representation > to support opaque metadata and addresses some of the security issues > associated with metadata retrieval. Comments welcome. > > thanx. > > -- Kevin J. Ma > > _______________________________________________ > CDNi mailing list > CDNi@ietf.org > https://www.ietf.org/mailman/listinfo/cdni
- [CDNi] CDNI Metadata Interface Kevin J Ma
- Re: [CDNi] CDNI Metadata Interface HeXiaoyan
- Re: [CDNi] CDNI Metadata Interface Kevin J Ma
- Re: [CDNi] CDNI Metadata Interface Francois Le Faucheur
- Re: [CDNi] CDNI Metadata Interface HeXiaoyan
- Re: [CDNi] CDNI Metadata Interface HeXiaoyan
- Re: [CDNi] CDNI Metadata Interface Kevin J Ma
- Re: [CDNi] CDNI Metadata Interface HeXiaoyan
- Re: [CDNi] CDNI Metadata Interface Kevin J Ma
- Re: [CDNi] CDNI Metadata Interface HeXiaoyan
- Re: [CDNi] CDNI Metadata Interface Francois Le Faucheur
- Re: [CDNi] CDNI Metadata Interface Kevin J Ma
- Re: [CDNi] CDNI Metadata Interface Kevin J Ma
- Re: [CDNi] CDNI Metadata Interface Francois Le Faucheur
- Re: [CDNi] CDNI Metadata Interface Kevin J Ma