open philosophies for associative autopoietic digital ecosystems
DESCRIPTION
TRANSCRIPT
OPAALS
Open Philosophies for Associative Autopoietic
DigitaL EcoSystemsSotiris Moschoyiannis, Amir r Razavi, Paul
Krause
Architecture and Process 2008
Introduction• What is a Digital Ecosystem
• A digital ecosystem is a self-organising digital infrastructure aimed at creating a digital environment for networked organizations that supports cooperation, knowledge sharing, the development of open and adaptive technologies and evolutionary business models.
• DE Business Environment
• Distributed Long-lived Transactions for SMEs
• Challenges
• Business transactions performance, failures and consistency
• Network response to dynamicity of environment, connectivity and fragmentations
The Web is an EcosystemThe Web is an Ecosystem
What is an Ecosystem?
•An interactive system established between living creatures and the environment in which they live–Arthur Tansley (1871-1955)
•(Arguably) The members of an ecosystem “benefit” from each others’ participation–Typically the respective populations in a predator-
prey relationship tend towards a stable (sometimes cyclic) attractor
The environment is:• a social context• a digital infrastructure
In a “Digital Ecosystem”
The members are:• e-Businesses, software
services, information sources
A Digital Ecosystem?
•The nature of the environment defines the properties of the ecosystem–we would claim
A complex, adaptive system?
•A digital ecosystem is a self-organising digital infrastructure aimed at creating a digital environment for networked organizations that supports cooperation, knowledge sharing, the development of open and adaptive technologies and evolutionary business models.
What are we trying to build?
• An environment which encourages diversity
• Absence of critical points of failure or control
• Preservation of “local autonomy” of participants
• only reveal what you choose to reveal
• Robust support for long-term transactions (interactions) between members
THE CONTENT, LINKS, AND TRANSACTIONS
• “I have a dream for the Web [in which computers] become capable of analyzing all the data on the Web – the content, links, and transactions between people and computers. A ‘Semantic Web’, which should make this possible, has yet to emerge, but when it does, the day-to-day mechanisms of trade, bureaucracy and our daily lives will be handled by machines talking to machines. The ‘intelligent agents’ people have touted for ages will finally materialize.”
• [ref: Berners-Lee, Tim; Fischetti, Mark (1999). Weaving the Web. Harper San Francisco, chapter 12. ISBN 9780062515872- ref: 24]
THE CONTENT, LINKS, AND TRANSACTIONS
• “I have a dream for the Web [in which computers] become capable of analyzing all the data on the Web – the content, links, and transactions between people and computers. A ‘Semantic Web’, which should make this possible, has yet to emerge, but when it does, the day-to-day mechanisms of trade, bureaucracy and our daily lives will be handled by machines talking to machines. The ‘intelligent agents’ people have touted for ages will finally materialize.”
• [ref: Berners-Lee, Tim; Fischetti, Mark (1999). Weaving the Web. Harper San Francisco, chapter 12. ISBN 9780062515872- ref: 24]
THE CONTENT, LINKS, AND TRANSACTIONS
• “I have a dream for the Web [in which computers] become capable of analyzing all the data on the Web – the content, links, and transactions between people and computers. A ‘Semantic Web’, which should make this possible, has yet to emerge, but when it does, the day-to-day mechanisms of trade, bureaucracy and our daily lives will be handled by machines talking to machines. The ‘intelligent agents’ people have touted for ages will finally materialize.”
• [ref: Berners-Lee, Tim; Fischetti, Mark (1999). Weaving the Web. Harper San Francisco, chapter 12. ISBN 9780062515872- ref: 24]
• “I have a dream for the Web [in which computers] become capable of analyzing all the data on the Web – the content, links, and transactions between people and computers. A ‘Semantic Web’, which should make this possible, has yet to emerge, but when it does, the day-to-day mechanisms of trade, bureaucracy and our daily lives will be handled by machines talking to machines. The ‘intelligent agents’ people have touted for ages will finally materialize.”
• [ref: Berners-Lee, Tim; Fischetti, Mark (1999). Weaving the Web. Harper San Francisco, chapter 12. ISBN 9780062515872- ref: 24]
THE CONTENT, LINKS, AND TRANSACTIONS
Hedges, et al. Continental breakup and the ordinal diversification
of birds and mammals, Nature 381, 226-229 (1996)
The solution•Software agents on behalf of people (SMEs)
• Gather and store local knowledge (local contexts);
• Collect and accumulate knowledge from outside (external links);
• Manage content;
• Promoting the stored contexts for outside and provide external links;
• Process business activities and transactions.
•Digital Business Ecosystem
• Keeping the transaction-created networks
• Creating a connected network between services (service providers – SMEs).
The complexity of Digital Business Ecosystem
• is not a connected network
•has a very dynamic nature
•content, links, transactions
•does not have potential for creating all sort of links between different content or service providers
• is relying on centralised controls for business activities
• is not fully resistant against failures and errors
• is not stable, with traffic bottlenecks and other uncontrolled parameters easily affecting the environment
Transactions in DEs•Correspond to business activities and involve complex interactions between service providers/consumers
•B2B scenarios require long-running transactions (min, hrs, days…) which involve the execution of a number of underlying services
•Comprise a mixture of different levels of composition (subtransactions) of several services from different service providers
•Local autonomy and loosely-coupled services – SMEs… but also SOA as the enabling technology of a DE for business
•ACID properties are questionable; Atomicity? Isolation? Consistency
•Release of results before transaction commit (partial results)
•Recovery management (recoverability)
•Compensation
•Omitted results
•Forward recovery
Managing dependencies
•Capture dependencies within and across transactions
•Within a transaction we use Internal Dependency Graphs (IDG)
•Across transactions we use External Dependency Graphs (EDG)
•Each platform only knows about before and after
•A fully distributed mechanism for local coordination and log-based recovery management in long-running transactions
Business network properties
•Connectivity
•Supporting Business activities (distributed business transactions)
•Resistant to fragmentations
•Transaction recoverability (costly)
•Forward recovery
•Alternative scenarios/paths (using diversity of DEs)
•Dynamicity
•Local Autonomy (loosely coupling)
•Time-based business activity (regional behaviour/availability)
•Versatile SMEs business model (changing the business nature time to time
21
Distributed coordination for executing transaction
22
Virtual Private Transaction Networks
23OPAALS23
A measurement for Platform stability
Virtualization levels
25
Connecting VPTNs
26
Super peers and permanent nodes
super peers are expensive nodes with costly maintenance requirements
Who is going to provide such
nodes?
during peak time the pressure of high traffic can result in a bottleneck on super peer nodes
How they cope with the dynamic network
structure?
processing redundant data and producing overheads waste at off-peak times of the network
while they will be continuously under pressure at peak time while the network grows
How regular cost increased can be
justified?
PERMANENT CLUSTERS & VIRTUAL SUPER PEERS
Good connectivity
Spreading Traffic
Clustering stability and local storage
Network Dynamicity on VSPs
Dynamic algorithm for choosing nodes for VSPs
Achilles heel of the networkhigh dependency on a few number of nodes
vulnerable on any smart attack on hubs
As the fragmentation on the network (creating islands in the network)
costly to repair (de-fragmentation)
inconsistency of such a model with the dynamicity of a digital ecosystem
SMEs may not provide stable and permanent nodes for hubs at all
This means fragmentation even without any external attack or physical failures
Digital Business Ecosystem network resistance against failures
31
Further work
•“Web 3.0, a phrase coined by John Markoff of the New York Times in 2006, refers to a supposed third generation of Internet-based services that collectively comprise what might be called 'the intelligent Web' — .... — which emphasize machine-facilitated understanding of information in order to provide a more productive and intuitive user experience.”