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Future Work on Yallcast Research Topics

This research focuses on various future work topics related to Yallcast, including applications, tree forwarding issues, cluster-related issues, content naming, asynchrony, ISP effects, tree configuration, tree performance, proxy server infrastructure, and mesh issues.

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Future Work on Yallcast Research Topics

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  1. Yallcast Research Topics Paul Francis NTT PF Labs francis@slab.ntt.co.jp www.yallcast.com

  2. Future Work (Research and/or Development) • Lots and lots of applications • YIDP: Nat boxes, dynamic IP addresses, no domain name, etc. • Tree forwarding issues: • Pushback • Fair queueing and priority queueing • Drop policies, etc….

  3. Future Work • Cluster (IP multicast) related: • “Reliable” transport: “yRMTP”, “yMRTP” • Kegs over clusters • Head election algorithm • Thin or no return channel (satellite, cable) • Larger clusters (admin scoped)

  4. Future Work • Content naming issues • More than just sequence numbers? Or leave “advanced” naming to app? • When to form new group versus sending new content over existing group---meta-group? (to manage multiple related groups) • Content types: spigot, bucket, keg, others?

  5. Future Work • Gross asynchrony: • policies for end-hosts (how long to stay in group, which groups to stay in, etc.) • policies for server-hosts (same questions, different answers) • Neighbor aliveness overhead • General work on looping algorithms

  6. Future Work • Effect on ISPs • Billing • Bursts of activity • Security • Content integrity (strong and weak) • Group membership • New denial-of-service?

  7. Future Work • Tree configuration • Fan-out, diameter, fairness (of fan-out) • Neighbor policies • Different access speeds (put fatter members near core? form multiple groups?) • Other (put senders near core, receive-only members further out?)

  8. Future Work • Tree performance • Methods for finding proximal neighbors (hacks, pings, “HOPS” service, etc. • E2E constraints (latency, for instance --- far away members maybe simply can’t join) • Flakey/slow members (move to leaves, kick-out?)

  9. Future Work • “Proxy Server” infrastructure • Policy issues (when to use proxy) • Proxy discovery • Proxy selection (esp. with heterogeneous proxies, i.e. fast versus fat proxies) • “Edge” proxy topologies versus “middle” (router-like) proxy topologies

  10. Future Work • Mesh issues: • Mesh robustness • Use of mesh for content delivery---do we need two kinds of mesh? • Use of mesh for temporary repair of tree---algorithms? • Nested Groups

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