Internet DRAFT - draft-irtf-p2prg-core-problem-statement
draft-irtf-p2prg-core-problem-statement
IRTF P2PRG J. Buford
Internet Draft Panasonic
Expires: July 13, 2006 K. Ross
Polytechnic
M. Kolberg
Stirling
January 13, 2006
CORE Subgroup Problem Statement
draft-irtf-p2prg-core-problem-statement-00.txt
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Internet-Draft P2PRG CORE Subgroup Problem Statement January 2006
Abstract
New research in the design of peer-to-peer overlay networks offers
the possibility of addressing limitations of existing service,
resource and content discovery methods. We identify the research
goals to be pursued in investigating new designs for global scale
service discovery. The purpose of this document is to attract
participation from other researchers interested in these problems and
to lead to a coordinated research approach within the P2PRG CORE
subgroup.
Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC-2119 [RFC2119].
Table of Contents
1. Content, Resource and Service Discovery........................2
2. Definitions....................................................3
3. Problem Statement..............................................4
3.1. Global-Scale Service Discovery............................4
3.2. Service-Oriented Overlays.................................5
3.3. Internet Infrastructure...................................5
3.4. Content and Resource Discovery / Search...................5
4. Security Considerations........................................6
5. References.....................................................7
5.1. Normative References......................................7
5.2. Informative References....................................8
Author's Addresses...............................................10
Intellectual Property Statement..................................10
Disclaimer of Validity...........................................11
Copyright Statement..............................................11
Acknowledgment...................................................11
1. Content, Resource and Service Discovery
Discovery of content, resources and services are fundamental
operations for peers in a peer-to-peer network. Many discovery
mechanisms have been proposed. However existing designs have
limitations in one or more areas of scalability, security,
interoperability, or generality. The purpose of this subgroup to
evaluate existing research, identify requirements, and develop
solutions for peer-to-peer content, resource, and service discovery
in wide-area networks. While content, resource, and service discovery
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have been conventionally addressed by separate mechanisms, we are
interested in identifying unified mechanisms where possible. As a
minimum we are interested in global-scale service discovery.
Existing methods for service discovery include client-server
mechansisms (such as SLP [RFC2608][RFC2609]), mechanisms integrated
into device network adapters (such as Bluetooth SDP
[BLU2001][BLU2004] and Salutation [SAL1996]), mechanisms integrated
in middleware platforms (such as Web services [W3C2004A] [W3C2004B]
[W3C2004C], Jini [JINI2003A][JINI2003B], and JXTA [TRA2004]), and
home network oriented solutions (UPnP SSDP [UPNP2000]).
In addition there are experimental systems for service discovery such
as SSDS [CZE1999] and these extensions to SLP: WASRV [ROS1997], wide-
area SLP [HUA2000], and mesh-enhanced SLP [RFC3528][ZHA2000]; and the
use of wide-area multicast to advertise and discover services
[MIC2004].
Further there are various peer-to-peer overlay networks and proposed
designs, both unstructured and structured by which large numbers of
peers share content and services. Typically large-scale unstructured
peer-to-peer systems use limited scope flooding or random walk to
reach other peers with requests, whereas structured peer-to-peer
systems use a distributed hash table (DHT) to store key-value peers.
The integration of peer-to-peer overlay networks with service
definition and lookup has emerged as "service overlay" [GU2004]. An
example of mapping service definitions to a structured multi-hop
overlay is INS/Twine [BAL2002]. An example of using peer-to-peer
overlay for web services lookup is [SCH2004]. A related proposal is
[BRA2004].
Associated with various discovery mechanisms are related mechanisms
for service/resource advertisement, description, and invocation.
More extensive surveys of existing methods of service discovery
protocols include [BET2000][LEE2002][ZHU2002] and [TRA2004].
2. Definitions
Group: a collection of peers or groups of peers satisfying some
membership constraint
Search: a discovery mechanism in which content or resources stored in
a peer-to-peer network can be searched using various methods
including text search, keyword search, content-based retrieval or
meta-data search
Service: a computational function packaged for use by other nodes in
a networked environment
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Service description: Information about a networked service such as
type of service, name of service, attributes of service, location of
service, invocation of service. May be stored in a document or at a
service repository or at the node offering the service; may be
broadcast or multicast by the node offering the service. May be
machine readable or human readable or both.
Service advertisement: the publication of a service description, in
whole or part, by or on behalf of the service offerer, for access by
other nodes
Service composition: the definition of a new service using two or
more existing services
Service discovery: retrieval or access of a service description by
nodes other than the service offerer, including browsing, search by
name, class, type and or service attributes
Service invocation: remote execution of a service over a computer
network
Service notification: an event signaling change in the availability
or state of a service
Service overlay: the use of an overlay network to store and lookup
service descriptions
3. Problem Statement
3.1. Global-Scale Service Discovery
A global-scale service discovery mechanism should provide the
following capabilities:
o Internet-wide service advertisement and discovery of services,
such that any service on the Internet can be discovered by any
peer on the Internet. The expected volume of transactions
expected in a global service discovery mechanism is in the range
of DNS lookup volume.
o Ability to index service descriptions by geographic location and
domain in which the services are available
o Ability to index service descriptions by arbitrary meta data
regarding the service
o Support for creating and using composite services from services
offered by different peers
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o Use of multiple service description formats which might be
tailored by application or level of semantic description
o Access to services, service descriptions, and service
advertisements dependent on authorization rights
o Access to services, service descriptions, and service
advertisements by peer group membership
o Individual domains can administer the service availability,
security, and service descriptions
In addition it is desirable that:
o The mechanism can be used in isolation by peers in PANs, ad hoc
networks, or other limited networking environments
o Collections of peers can join and separate from other collections
of peers without interruption a service discovery capability
within the respective collections
o The mechanism is compatible with existing service discovery
mechanisms, possibly through gateways
3.2. Service-Oriented Overlays
o The mechanism is open with respect to the overlay network, and
should work with multiple distinct overlay networks
o Different overlays supporting service discovery will vary by
architecture, security, and performance characteristics
3.3. Internet Infrastructure
o The mechanism may be used for portions Internet infrastructure
services such as DNS [COX2002].
o The mechanism does not require changing existing Internet
infrastructure
3.4. Content and Resource Discovery / Search
o The mechanism for service discovery may be useful for content and
resource discovery, and a unified design is desirable
o Indexing, mapping, and lookup for specific discovery types in the
overlay may vary
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4. Security Considerations
There are no new security considerations in this document.
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5. References
5.1. Normative References
[BLU2004] Bluetooth Specification version 2. Vol. 3 Core System
Package. Part B Service Discovery Protocol (SDP).
[BLU2001] Bluetooth Specification version 1.1. Service Discovery
Application Profile. Part K:2. Feb 22, 2001.
[IANASLP] IANA service location templates.
http://www.iana.org/assignments/svrloc-templates/
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2234] Crocker, D. and Overell, P.(Editors), "Augmented BNF for
Syntax Specifications: ABNF", RFC 2234, Internet Mail
Consortium and Demon Internet Ltd., November 1997.
[RFC2608] E. Guttman, C. Perkins, J. Veizades, M. Day. Service
Location Protocol, Version 2. IETF RFC 2608. June 1999.
[RFC2609] E. Guttman, C. Perkins, J. Kempf. Service Templates and
Service: Schemes. IETF RFC 2609. June 1999.
[RFC3528] W. Zhao, H. Schulzrinne. Mesh-enhanced Service Location
Protocol (mSLP). IETF RFC 3528. April 2003.
[UPN2000] UPnP Forum. UPnP Device Architecture. Version 1. June 8,
2000.
[W3C2004a]W3C. Web Services Architecture.
http://www.w3.org/TR/2004/NOTE-ws-arch-20040211/. Feb 11,
2004.
[W3C2004b]W3C. Web Services Description Language version 2.0 Part
1: Core Language. http://www.w3.org/TR/wsdl20 Aug 3, 2004.
[W3C2004c]W3C. Web Services Description Language (WSDL) Version 2.0.
Part 3: Bindings. http://www.w3.org/TR/wsdl20-bindings Aug
3, 2004.
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5.2. Informative References
[BAL2002] M. Balazinska, H. Balakrishnan, and D. Karger. INS/Twine: A
Scalable Peer-to-Peer Architecture for Intentional Resource
Discovery. In Proceedings of Pervasive 2002.
[BAR1999] M. Barbeau. Service discovery in a mobile agent API using
SLP, Global Telecommunications Conference (GLOBECOM '99),
1999, 391-395 vol. 1a
[BET2000] C. Bettstetter, C. Renner. A Comparison of Service
Discovery Protocols and Implementation of the Service
Location Protocol, In proceeding of Open European Summer
School (EUNICE), Twente Netherlands, September 13-15, 2000.
[BRA2004] William B. Bradley, David P. Maher. The NEMO P2P Service
Orchestration Framework. Proceedings of the 37th Hawaii
International Conference on System Sciences - 2004
[COL2003] Mesh-Enhanced SLP Project at Columbia Univ:
http://www1.cs.columbia.edu/~zwb/project/slp/
[COX2002] R. Cox, A. Muthitacharoen, and R. T. Morris, Serving DNS
using a Peer-to-Peer Lookup Service, IPTPS, Mar. 2002
[CZE1999] Czerwinski, S. E., et al. 1999. An architecture for a
secure service discovery service. In Proceedings of the 5th
Annual ACM/IEEE international Conference on Mobile
Computing and Networking (Seattle, Washington, United
States, August 15 - 19, 1999). MobiCom '99. ACM Press, New
York, NY, 24-35
[FRE2004] Freudenthal, E. and Karamcheti, V. 2004. DisCo: Middleware
for Securely Deploying Decomposable Services in Partly
Trusted Environments. In Proceedings of the 24th
international Conference on Distributed Computing Systems
(Icdcs'04) (March 24 - 26, 2004). ICDCS. IEEE Computer
Society, Washington, DC, 494-503. [GOT2002] K. Gottschalk,
S. Graham, H. Kreger, J. Snell. Introduction to Web
Service Architecture. IBM Systems J. v 41 n 2. 2002.
[GU2004] Gu, X., Nahrstedt, K., and Yu, B. 2004. SpiderNet: An
Integrated Peer-to-Peer Service Composition Framework. In
Proceedings of the 13th IEEE international Symposium on
High Performance Distributed Computing (Hpdc'04) - Volume
00 (June 04 - 06, 2004). HPDC. IEEE Computer Society,
Washington, DC, 110-119.
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[HUA2000] An-Cheng Huang and Peter Steenkiste. A Flexible
Architecture for Wide-Area Service Discovery,. The Third
IEEE Conference on Open Architectures and Network
Programming (OPENARCH 2000), March 26-27, 2000.
[JIN2003a] Sun Microsystems. Jini Architecture Specification v 2.
June 2003.
[JIN2003b] Sun Microsystems. Jini™ Technology Core Platform
Specification. June 2003.
[LEE2002] C. Lee and S. Helal. Protocols for Service Discovery in
Dynamic and Mobile Networks. Intl. J. of Computer
Research. v. 11 n 1 pp. 1-12. 2002.
[MIC2004] Microsoft. Web Services Dynamic Discovery (WS-Discovery).
Oct 2004.
[RAM2002] Raman, B., et al. 2002. The SAHARA Model for Service
Composition across Multiple Providers. In Proceedings of
the First international Conference on Pervasive Computing
(August 26 - 28, 2002). F. Mattern and M. Naghshineh, Eds.
Lecture Notes In Computer Science, vol. 2414. Springer-
Verlag, London, 1-14.
[ROS1997] J.Rosenberg, H.Schulzrinne, B.Suter. Wide Area Network
Service Location. IETF draft-ietf-svrloc-wasrv-01.txt.
Work in progress. Nov 14, 1997.
[SAL1996] Salutation Consortium. Salutation Architecture
Specification (part 1) Version 2.0c. www.salutation.org
[SCH2004] C. Schmidt and M. Parashar, A Peer-to-Peer Approach to Web
Service Discovery, World Wide Web Journal, Vol. 7, Issue 2,
June 2004
[STE1998] M. v. Steen, F. J. Hauck, P. Homburg, and A. S. Tanenbaum,
Locating Objects in Wide-Area Systems, IEEE Communications
Magazine, January, 1998, pp. 104-109
[TRA2004] Bernard Traversat, Ahkil Arora, Mohamed Abdelaziz, Mike
Duigou, Carl Haywood, Jean-Christophe Hugly, Eric Pouyoul,
Bill Yeager. Project JXTA 2.0 Super-Peer Virtual Network.
www.jxta.org
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[ZHA2000] Weibin Zhao, Henning Schulzrinne, and Erik Guttman, "mSLP -
Mesh-enhanced Service Location Protocol", in International
Conference on Computer Communication and Network, Las
Vegas, Nevada, October 2000.
[ZHU2002] F. Zhu, M. Mutka, L. Ni. Classification of Service
Discovery in Pervasive Computing Environments. MSU-CSE-02-
24, Michigan State University, EastLansing, 2002.
Author's Addresses
John Buford
Panasonic Digital Networking Lab
2 Research Way, 3rd Floor
Princeton, NJ 08540
Email: buford@research.panasonic.com
Keith Ross
Department of Computer and Information Science
Polytechnic University
Six MetroTech Center
Brooklyn, NY 11201
Email: ross@poly.edu
Mario Kolberg
Room 4B60, Cottrell Building
Department of Computing Science and Mathematics
University of Stirling
Stirling FK9 4LA
Scotland
Email: mkolberg@ieee.org
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