Brokering Planning Metadata in a P2P Environment
Identifieur interne : 000759 ( Main/Exploration ); précédent : 000758; suivant : 000760Brokering Planning Metadata in a P2P Environment
Auteurs : Johannes Oudenstad [Norvège] ; Romain Rouvoy [Norvège] ; Frank Eliassen [Norvège] ; Eli Gj Rven [Norvège]Source :
- Lecture Notes in Computer Science [ 0302-9743 ] ; 2008.
English descriptors
- Teeft :
- Adaptation middleware, Blueprint, Broker, Freepastry, Immediate neighbors, Metadata, Middleware, Node, Node failure, Node failures, Outdated information, Planner, Planning metadata, Planning middleware, Property type, Property types, Query, Replication, Replication scheme, Resource, Resource discovery, Responsible node, Service description, Service mirror, Service planner, Service planners, Service planning, Service type, Service types, Smalltalk code, Thin lines, Uddi, Uddi registry, Uids, Wild card.
Abstract
Abstract: In self-adaptive systems, metadata about resources in the system (e.g., services, nodes) must be dynamically published, updated, and discarded. Current adaptive middleware approaches use statically configured, centralized repositories for storing and retrieving of such metadata. In peer-to-peer (P2P) environments, we can not assume the existence of server nodes that are always available for hosting such centralized services. However, the metadata repository is the keystone of the adaptation middleware and the consistency of adaptations relies on its reliability. To address this limitation in our QuA planning-based adaptation middleware, we introduce a P2P broker, which is a metadata advertisement service based on P2P technology. This P2P broker can be plugged into the QuA middleware to support the construction of self-adaptive applications in a P2P environment. We use a structured P2P protocol that distributes the service metadata over a set of nodes based on service type and property information. The P2P broker is therefore capable of handling node failures by providing replication of the metadata. We present a working prototype of the P2P broker as well as results from initial experiments. These results show that the metadata distributes well over the nodes in the network, thus enabling scalability and robustness to node failures.
Url:
DOI: 10.1007/978-3-540-68642-2_14
Affiliations:
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Le document en format XML
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Box 1080, N-0314</wicri:orgArea></affiliation><affiliation></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Norvège</country></affiliation></author><author><name sortKey="Gj Rven, Eli" sort="Gj Rven, Eli" uniqKey="Gj Rven E" first="Eli" last="Gj Rven">Eli Gj Rven</name><affiliation></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Norvège</country></affiliation></author></analytic><monogr></monogr><series><title level="s">Lecture Notes in Computer Science</title><imprint><date>2008</date></imprint><idno type="ISSN">0302-9743</idno><idno type="eISSN">1611-3349</idno><idno type="ISSN">0302-9743</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0302-9743</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="Teeft" xml:lang="en"><term>Adaptation middleware</term><term>Blueprint</term><term>Broker</term><term>Freepastry</term><term>Immediate neighbors</term><term>Metadata</term><term>Middleware</term><term>Node</term><term>Node failure</term><term>Node failures</term><term>Outdated information</term><term>Planner</term><term>Planning metadata</term><term>Planning middleware</term><term>Property type</term><term>Property types</term><term>Query</term><term>Replication</term><term>Replication scheme</term><term>Resource</term><term>Resource discovery</term><term>Responsible node</term><term>Service description</term><term>Service mirror</term><term>Service planner</term><term>Service planners</term><term>Service planning</term><term>Service type</term><term>Service types</term><term>Smalltalk code</term><term>Thin lines</term><term>Uddi</term><term>Uddi registry</term><term>Uids</term><term>Wild card</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: In self-adaptive systems, metadata about resources in the system (e.g., services, nodes) must be dynamically published, updated, and discarded. Current adaptive middleware approaches use statically configured, centralized repositories for storing and retrieving of such metadata. In peer-to-peer (P2P) environments, we can not assume the existence of server nodes that are always available for hosting such centralized services. However, the metadata repository is the keystone of the adaptation middleware and the consistency of adaptations relies on its reliability. To address this limitation in our QuA planning-based adaptation middleware, we introduce a P2P broker, which is a metadata advertisement service based on P2P technology. This P2P broker can be plugged into the QuA middleware to support the construction of self-adaptive applications in a P2P environment. We use a structured P2P protocol that distributes the service metadata over a set of nodes based on service type and property information. The P2P broker is therefore capable of handling node failures by providing replication of the metadata. We present a working prototype of the P2P broker as well as results from initial experiments. These results show that the metadata distributes well over the nodes in the network, thus enabling scalability and robustness to node failures.</div></front></TEI><affiliations><list><country><li>Norvège</li></country><region><li>Østlandet</li></region><settlement><li>Oslo</li></settlement></list><tree><country name="Norvège"><noRegion><name sortKey="Oudenstad, Johannes" sort="Oudenstad, Johannes" uniqKey="Oudenstad J" first="Johannes" last="Oudenstad">Johannes Oudenstad</name></noRegion><name sortKey="Eliassen, Frank" sort="Eliassen, Frank" uniqKey="Eliassen F" first="Frank" last="Eliassen">Frank Eliassen</name><name sortKey="Eliassen, Frank" sort="Eliassen, Frank" uniqKey="Eliassen F" first="Frank" last="Eliassen">Frank Eliassen</name><name sortKey="Gj Rven, Eli" sort="Gj Rven, Eli" uniqKey="Gj Rven E" first="Eli" last="Gj Rven">Eli Gj Rven</name><name sortKey="Rouvoy, Romain" sort="Rouvoy, Romain" uniqKey="Rouvoy R" first="Romain" last="Rouvoy">Romain Rouvoy</name><name sortKey="Rouvoy, Romain" sort="Rouvoy, Romain" uniqKey="Rouvoy R" first="Romain" last="Rouvoy">Romain Rouvoy</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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