CDNI W. Jin
Internet-Draft M. Li
Intended status: Informational B. Khasnabish
Expires: September 29, 2013 ZTE Corporation
March 28, 2013
Content De-duplication for CDNi Optimization
draft-jin-cdni-content-deduplication-optimization-04
Abstract
Recent explosive growth of content delivery/distribution networks
(CDNs) and their interconnection are causing unintended repetition of
content storage in the same dCDN. This can be avoided by using a
suitable de-duplication mechanism. This document explores the
scenarios which create the problem, and then discusses the approaches
to eliminate the duplicated transmission of the same content from
uCDN(s) to dCDN in CDNi networks. To implement the optimization,
some enhancement to the CDNi metadata model and interface is
required.
We realize that for business-specific purposes the same content may
be encrypted/packaged with different keys for different providers.
The impact of DRM (Digital Rights Management) technology on de-
duplication will be discussed in a future version of this draft.
Status of this Memo
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Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved.
Jin, et al. Expires September 29, 2013 [Page 1]
Internet-Draft CDNi Content De-duplication Optimization March 2013
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Deployment Scenarios . . . . . . . . . . . . . . . . . . . . . 4
2.1. Impact of Content Duplication on the Network System . . . 4
2.2. Current Data Deduplication Technologies . . . . . . . . . 5
2.3. Content Duplication Scenario Involved in this Draft . . . 5
2.3.1. Scenario 1 . . . . . . . . . . . . . . . . . . . . . . 5
2.3.2. Scenario 2 . . . . . . . . . . . . . . . . . . . . . . 6
2.3.3. Scenario 3 . . . . . . . . . . . . . . . . . . . . . . 7
3. Content Naming for CDNi . . . . . . . . . . . . . . . . . . . 8
3.1. Uniqueness . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2. Ownership . . . . . . . . . . . . . . . . . . . . . . . . 9
4. CDNi Content De-duplication Optimization Implementation . . . 9
4.1. Constant URL . . . . . . . . . . . . . . . . . . . . . . . 9
4.2. Content Naming Mechanism . . . . . . . . . . . . . . . . . 10
4.3. Content ID . . . . . . . . . . . . . . . . . . . . . . . . 11
4.4. Description of Content De-duplication . . . . . . . . . . 12
4.4.1. Pre-Positioned Content Acquisition . . . . . . . . . . 13
4.4.2. Dynamic Content Acquisition . . . . . . . . . . . . . 14
4.4.3. Content Purge and Invalidate . . . . . . . . . . . . . 16
5. Security Considerations . . . . . . . . . . . . . . . . . . . 18
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 18
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 18
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.1. Normative References . . . . . . . . . . . . . . . . . . . 18
8.2. Informative References . . . . . . . . . . . . . . . . . . 18
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 19
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