Snapshot

1
Snapshot Stéphane Laurière and Radu POP May 2005
2
Who's doing what ? on EDOS

• WP2 Package dependencies management
• Paris7 TelAviv
• WP3 Testing and QA
• Nuxeo Mandriva
• WP4 Code distribution
• INRIA Geneva TelAviv Mandriva Torino
  Zurich
• WP5 Metrics and evaluation
• Mandriva
• WP6 Dissemination
• Paris7

3
First deliverable period

• Agenda
• Kick-off meeting
• 2 phone confs (WP4)
• Geneva meeting (WP4)
• Regular meetings at INRIA (WP4)
• 2 meetings Paris7 (WP2)

• Results
• EDOS site and Wiki pages
• State of the art document
• Metrics proposal
• The set of deliverables
• OSS Genova paper

4
Metrics Quality model

• In practice Perl scripts MySQL
• Mirror monitoring
• Mirror chart (idea)

Consistency
Quality of
Edit Distance
Content
Freshness
(from the latest system version)
Package Delay
Resource Availability
Time to get a
Resource Size
version/package
Transfer Speed
Quality of Service (from the user's point
of view)
Ease of Use
Finding the source
Effort to get a
Choosing a server
version/package
Space
Runtime
User's Cost
Bandwidth
User's Satisfaction
5
Metrics Example
6
Distribution process

• General view
• Workflow API

7
Problem

• Data type
• big number of files (packages) -gt 10.000
• size of the distribution -gt 10 GB
• Different types of participants
• developers, contributors, testers, users
• Specifics
• frequent changes -gt tens updates / day
• distribution's coherence
• notification of updates

8
Distribution task

• Theoretical
• ActiveXML KadoP
• Indexing and searching data
• Tova's proposal
• Notification
• Distribution
• New users

• Pragmatic
• BitTorrent
• Improve the current protocol -gt dynamic
  BitTorrent
• Rsync
• Optimisations on delete-during option
• Cooker
• Insertion of the EDOS package

9
Static BitTorrent

• Deltas between torrents
• For each file change a new torrent is generated
• Deltas too big
• The torrent should be replaced

RC1
RC1.torrent
RC2
RC2.torrent
p1
p2
p3
p4
p5
pm
...
10
Dynamic BitTorrent

• A new level of redirection

Cooker2006.torrent
RC1
fn.torrent
f1.torrent
f3.torrent
f2.torrent
RC2
11
Next steps ?

• Get insight on existing P2P systems
• OceanStore (Tapestry), KadoP (Pastry),
• Pgrid, Chord
• Architectures
• Enhance the API
• Define a general model
• Prototype
• Based on BitTorrent ?, KadoP ?