Fast reliable email access using globally distributed caches
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Fast, Reliable Email Access Using Globally Distributed Caches Martha Mercaldi Charlie Reis Tal Shaked Kasia Wilamowska Danny Wyatt Motivation Danny travels often Email = file-sharing Transfer of large files Need fast access to remote data Need reliability Solution

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Fast reliable email access using globally distributed caches l.jpg

Fast, Reliable Email Access Using Globally Distributed Caches

Martha Mercaldi

Charlie Reis

Tal Shaked

Kasia Wilamowska

Danny Wyatt


Motivation l.jpg
Motivation Caches

  • Danny travels often

    • Email = file-sharing

    • Transfer of large files

  • Need fast access to remote data

  • Need reliability


Solution l.jpg
Solution Caches

  • Global servers cache email

    • Servers = distributed backup

    • Fast

    • Reliable

  • Cost-efficient



Problem decomposition with jackson frames l.jpg
Problem decomposition with Jackson frames Caches

  • Machine Domain

    • Email System Program (ESP)

  • Causal Domains

    • Home Server (HS)

    • Local Server (LS)

    • Backup Servers (BS)

    • Employee Machine (EM)

  • Biddable Domain

    • Employee (E)

  • Lexical Domains

    • Site Location (SL)

    • Email Message Source (EM)

    • Employee Information (EI)


System properties verified with spin model l.jpg
System properties verified with Spin model Caches

  • All messages will be stored in at least two places.

  • All messages will always be on the Home Server

  • Any request for a message will eventually be satisfied

  • If a message is requested from a remote location, it will be cached locally for later retrieval

  • Current backup copy of any message will not be deleted.


Summary l.jpg
Summary Caches

  • Globally Distributed Caches

    • Fast Retrieval

    • Reliable Access


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