Hi Richard, Thank you for the pointer. Indeed there are lots of cases motivating the extension of ALTO cost value expressions. And as you pointed, the challenge is then to keep the extension compact and flexible. I will take a closer look to your draft.
Thanks Sabine De : alto [mailto:[email protected]] De la part de Y. Richard Yang Envoyé : mardi 20 octobre 2015 01:21 À : Drafts IETF Cc : IETF ALTO; [email protected] Objet : Re: [alto] I-D Action: draft-ietf-alto-multi-cost-01.txt Sabine, Wendy, Nico, Just want to let you know that I just wrote a first version draft of supporting general cost types, and multi-cost is an example motivating the design: https://datatracker.ietf.org/doc/draft-yang-alto-general-cost-type/ I see other "struct" types to be defined, to replace the generic JSONValue in both ECS and cost maps. The basic idea is to go beyond 'numerical' and 'ordinal' in 'cost-mode'. Instead, we introduce schema languages, and the 'cost-mode' indicates the schema language and 'cost-metric' indicate the type defined using the schema language. It will be great to discuss how the "general" design might have on your multi-cost design. The example I gave uses YANG as the schema specification language, but unfortunately it does not produce as compact, flexible a representation as your spec. Richard On Mon, Oct 19, 2015 at 6:27 PM, <[email protected]<mailto:[email protected]>> wrote: A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Application-Layer Traffic Optimization Working Group of the IETF. Title : Multi-Cost ALTO Authors : Sabine Randriamasy Wendy Roome Nico Schwan Filename : draft-ietf-alto-multi-cost-01.txt Pages : 23 Date : 2015-10-19 Abstract: The ALTO (Application Layer-Traffic Optimization) Protocol ([RFC7285]) defines several services that return various metrics describing the costs between network endpoints. For example, when downloading a file that is mirrored on several sites, a user application may use these ALTO cost metrics to determine the most efficient mirror site. An ALTO Server may offer a variety of cost metrics, based on latency, bandwidth, hop count, jitter, or whatever else the ALTO Server deems useful. When selecting a mirror site, a client may consider more than one metric, perhaps trading bandwidth for latency. While the base ALTO Protocol allows a client to use more than one cost metric, to do so, the client must request each metric separately. This document defines a new service that allows a client to retrieve several cost metrics with one request, which is considerably more efficient. In addition, this document extends the ALTO constraint tests to allow a user to specify an arbitrary logical combination of tests on several cost metrics. The IETF datatracker status page for this draft is: https://urldefense.proofpoint.com/v2/url?u=https-3A__datatracker.ietf.org_doc_draft-2Dietf-2Dalto-2Dmulti-2Dcost_&d=AwICAg&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=4G36iiEVb2m_v-0RnP2gx9KZJjYQgfvrOCE3789JGIA&m=Xd_HLgaqYezBYFKuvPwEy-l1yTedlgKtJkOH4V34Yuc&s=ll9Yp5oMnBYK4CbUwySW4fnVY71Vwby7CAe9OUUGB_U&e= There's also a htmlized version available at: https://urldefense.proofpoint.com/v2/url?u=https-3A__tools.ietf.org_html_draft-2Dietf-2Dalto-2Dmulti-2Dcost-2D01&d=AwICAg&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=4G36iiEVb2m_v-0RnP2gx9KZJjYQgfvrOCE3789JGIA&m=Xd_HLgaqYezBYFKuvPwEy-l1yTedlgKtJkOH4V34Yuc&s=TxiqIdnCP_WDu4XTslMrXpyEK-HRPv5WIYZo8OiBYO0&e= A diff from the previous version is available at: https://urldefense.proofpoint.com/v2/url?u=https-3A__www.ietf.org_rfcdiff-3Furl2-3Ddraft-2Dietf-2Dalto-2Dmulti-2Dcost-2D01&d=AwICAg&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=4G36iiEVb2m_v-0RnP2gx9KZJjYQgfvrOCE3789JGIA&m=Xd_HLgaqYezBYFKuvPwEy-l1yTedlgKtJkOH4V34Yuc&s=r-ambg6GI5PWGIZJyGfKe2xhkgO7Ph-Eb_Jm5XP43PY&e= Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org<http://tools.ietf.org>. Internet-Drafts are also available by anonymous FTP at: https://urldefense.proofpoint.com/v2/url?u=ftp-3A__ftp.ietf.org_internet-2Ddrafts_&d=AwICAg&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=4G36iiEVb2m_v-0RnP2gx9KZJjYQgfvrOCE3789JGIA&m=Xd_HLgaqYezBYFKuvPwEy-l1yTedlgKtJkOH4V34Yuc&s=Ufa7jowVSi9gYQn2VUSQqHxvNfbqTtUfsstPV8_SaBY&e= _______________________________________________ alto mailing list [email protected]<mailto:[email protected]> https://urldefense.proofpoint.com/v2/url?u=https-3A__www.ietf.org_mailman_listinfo_alto&d=AwICAg&c=-dg2m7zWuuDZ0MUcV7Sdqw&r=4G36iiEVb2m_v-0RnP2gx9KZJjYQgfvrOCE3789JGIA&m=Xd_HLgaqYezBYFKuvPwEy-l1yTedlgKtJkOH4V34Yuc&s=9BdPcPlcfWEL2-8O5l5NDaKW7fX1cIQx0SJGAjB0uA4&e=
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