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PlanetLab Current Status

PlanetLab Current Status. Brent Chun Timothy Roscoe David Culler 8 th November 2002. Overview. PlanetLab is about 5 months old Development primarily here and Princeton Research topics at Berkeley only just emerging This talk is a overview of where we’re currently headed.

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PlanetLab Current Status

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  1. PlanetLab Current Status Brent Chun Timothy Roscoe David Culler 8th November 2002

  2. Overview • PlanetLab is about 5 months old • Development primarily here and Princeton • Research topics at Berkeley only just emerging • This talk is a overview of where we’re currently headed. • Slightly Mothy-centric since Brent is ill • But go talk to him!

  3. Deployment • 101 nodes, 42 sites • Line of University volunteer sites • Some Industrial research volunteers • Budget for colo centers • Boot CD in development for next phase

  4. Research Agenda • Very early stages • S/w development, operations and support moving (slowly) to DSL team • Current small-ish projects here: • Resource brokers • DHT benchmarking • InfoSpect monitoring • Spread-spectrum storage • Deployment languages • Economic resource management

  5. Resource Brokers / Slices • Brent, Mothy, Larry Peterson, etc. • IPTPS: “Slices: Providing a Stable Core for Peer-to-Peer Applications” • Key PlanetLab rsrc allocation issue • How does an application request a slice? • How is it allocated? • How does the process span multiple providers? • How are allocations verified?

  6. DHT Benchmarking • Mothy, Sean Rhea (Oceanstore) • IPTPS: “CANs Need Application-Driven Benchmarks” • Aims: • Design good benchmarks for DHTs/CANs/DOLRs • Get real results using PlanetLab • Demonstrate the differences between systems • Currently: Tapestry, Chord • Pastry, Strawman in process

  7. Rules InfoSpect Ping Ssh Results of Prolog queries Observations as Prolog facts Ganglia Discovery tools / wrapper scripts Prolog Knowledge Base Results

  8. InfoSpect monitoring • Mothy • SIGOPS EW: “InfoSpect: using a Logic Language for System Health Monitoring in Distributed Systems” • Use of Prolog engine for PlanetLab fault diagnosis • “Axioms” prime the system • Small “driver scripts” discover information • Inference rules encode assumptions • Queries return anomalous conditions

  9. InfoSpect example • Trivial example: badstuff(Problem,Site) :- db_host(Site,DbHost,DbIp,_,_), ssh_greeting(DbIp,_), ping_failed(DbIp), swritef(Problem, '%w (%w) is filtering pings (and possibly other stuff)', [ DbHost,DbIp ]). • About a dozen of these tests and growing. • Runs continuously • Somewhat depressing results 

  10. Spread-spectrum storage • Mothy + Steve Hand (Univ. Cambridge) • Remember interview talk  • Transient, “soft capacity” storage for PlanetLab • User software distribution • Log file / results collection • Other calls for storage services • Oceanstore, SFS,

  11. Deployment languages • Mothy, and whoever • Appropriate languages for expressing the deployment of PlanetLab applications • Apply declarative techniques • Borrow ideas from component languages • Possible synergy with macroprogramming • Just a wild and crazy idea right now

  12. Economic Resource Management • Brent, et.al. • Policies built over slice model • Resource consolidators • etc. • Lots of code being written • Please ask Brent when he’s recovered – if he were here he would say a lot more.

  13. Other work we know about: • UCB: Oceanstore, ROC • UWash scriptroute • Duke AC/DC (adaptive overlays) • Princeton: RON routing service • Cambridge: PlanetProbe • Rice: Topology-aware Pastry • CMU: launching DoS attacks • …and many more

  14. Summary • Still “finding our feet” research-wise • Lots of issues coming out of deployment • Beginning to engage UCB students more • Reasonably gaggle of research directions

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