Pangaea: A File Service for PlanetaryScale Distributed Applications

1
Pangaea A File Service for Planetary-Scale
Distributed Applications

• Yasushi Saito, Christos Karamanolis, Magnus
  Karlsson, Mallik Mahalingam

HP Laboratories
2
Pangaea A Wide-area File Service

• Goals wide area performance availability with
  local-area feel.
• ?1000 nodes, ?1010 files.
• Support frequently written files.
• Decentralization.
• Applications
• Wide-area collaboration, dist. application
  services.
• Approaches
• Aggressive replication.
• Proactive update propagation.
• QoS-conscious data placement.

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Overview

• Many files, replicated on ?1000 nodes.
• Each replica has a limited view of the replica
  set
• A connected graph maintained for each object

Root
/Joe
/Joe/movie.mpg
/Joe/mail.txt
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Research Issues

• Cheap but reliable replica addition/removal
• Automatic graph shaping
• When and where to create and remove replicas?

Root
/Joe
/Joe/movie.mpg
/Joe/mail.txt
Contact ysaito_at_hpl.hp.com http//www.hpl.hp.com/r
esearch/itc/csl/ssp/