1P2P4mm workshop, Vico Equense 6. June 2008 Information Society Technologies VICTORY – a multimodal, cross-platform and distributed multimedia repository Jernej Trnkoczy

1P2P4mm workshop, Vico Equense 6. June 2008 Summary VICTORY project introduction Use case example and requirements Decisions on system architecture Technology Conclusions

1P2P4mm workshop, Vico Equense 6. June 2008 VICTORY project Audio-VIsual ConTent search retrieval in a distributed p2p repositORY IST FP6 project 9 partners 425PMs, 3.8MEUR (2.2 – EC contribution)

1P2P4mm workshop, Vico Equense 6. June 2008 Use case example Automotive industry: Product designers assigned to design specific automotive part Discover and retrieve 3D CAD designs and other associated content (query by example!) Exploit the retrieved content (e.g. modifying, combining, making decisions, etc.) in product development processes Publish/share new/modified content.

1P2P4mm workshop, Vico Equense 6. June 2008 Main requirements Content and context based search of Multipedia objects Repository built by the users Support for mobile devices (mobile phones and PDAs) Serving industrial applications –Security (content and services) –Reliability Scalability to growing number of users –Distributed data storage –Distributed network bandwidth –Sharing computational power of peers (low level features extraction – indexing and searching, remote rendering...)

1P2P4mm workshop, Vico Equense 6. June 2008 Multipedia – what is it? A collection of a 3D object along with its accompanied information (2D views, text, audio, video). Multipedia object example:

1P2P4mm workshop, Vico Equense 6. June 2008 Content and context based search engine Content based search (search by example) = using low-level geometric characteristics Context based search = using high-level features –Ontological concepts- annotation options provided by the system –Text mining and NLP on textual attachments Relevance feedback A complex search engine – standalone version is 1.5GB installation!

1P2P4mm workshop, Vico Equense 6. June 2008 Common p2p search mechanism options DHT-based solution Unstructured overlays (flooding, random walks...) – 1.5GB search engine on every peer? –Search operation CPU intensive –Completeness of results Grid-like approach (Napster).

1P2P4mm workshop, Vico Equense 6. June 2008 Our choice – hybrid architecture Grid-like approach for search functionality – Searching and indexing (and other services) only on reliable, high-power machines with public and static IP addresses – super peers –Workload management mechanism P2P approach for download functionality – Distributed storage – files stored on edge peers – Distributed bandwidth - simultaneous download from many peers

1P2P4mm workshop, Vico Equense 6. June 2008 Architecture MEP... mobile edge peer EP... desktop edge peer MGW... mobile gateway

1P2P4mm workshop, Vico Equense 6. June 2008 Super peer services Searching/Indexing –Indexing performed on only one super peer –The same index on all super peers – periodic index updating –Request Broker Relays for peers hidden behind NAT and firewalls Download service –Indexing super peer needs to index textual attachments –Super peers act as seeding content providers. Gateway for mobile devices Other services (rendering, DRM, Identity management etc.)

1P2P4mm workshop, Vico Equense 6. June 2008 Edge peer services Download service (client and server) Low level features extraction

1P2P4mm workshop, Vico Equense 6. June 2008 Selected technology Search engine –Modified Empolis e:IAS –Novel low-level features extraction algorithms from ITI-CERTH P2P functionality based on JXTA protocols Client-server communication using web services over HTTP

1P2P4mm workshop, Vico Equense 6. June 2008 Conclusions Hybrid architecture fits the requirements better than pure P2P architecture: –Sophisticated search engine –Control over performance and reliability –Strict security needs Completely distributed (pure P2P) search of this complexity is very difficult (if not impossible) to realize.

1P2P4mm workshop, Vico Equense 6. June 2008 Questions