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Distributed Filesystems (part 3)

Distributed Filesystems (part 3). CPS210 Spring 2006. Papers. Speculative Execution in a Distributed File System Ed Nightingale. Speculative NFS. What about AFS?. What about Coda?. When to transfer, when to block?. Orig(P). Spec(P). Orig(C). Spec(C). Orig(X). Spec(C’). Spec(C’).

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Distributed Filesystems (part 3)

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  1. Distributed Filesystems (part 3) CPS210 Spring 2006

  2. Papers • Speculative Execution in a Distributed File System • Ed Nightingale

  3. Speculative NFS What about AFS? What about Coda?

  4. When to transfer, when to block? Orig(P) Spec(P) Orig(C) Spec(C) Orig(X) Spec(C’) Spec(C’)

  5. Undo log If speculation is on a read-only operation (stat) Speculation structure (P) Undo Log (P) Pre-stat checkpoint state (P) Speculation structure (P’) Undo Log (P’) no checkpoint state needed

  6. Undo log If speculation is on modifying operation (mkdir) Speculation structure (P) Undo Log (P) Pre-mkdir checkpoint state (P) Speculation structure (P’) Undo Log (P’) no checkpoint state needed

  7. Undo log If speculation is on modifying operation (mkdir) Speculation structure (P) Undo Log (P) Pre-mkdir checkpoint state (P) Speculation structure (P’) Undo Log (P’) Ok mkdir checkpoint state (P’)

  8. IPC example Why log entry in 8001, not in 8000?

  9. Results • Use Apache 2.0.28 source • Untar • Configure • Make • Remove

  10. Results How to compare to Coda in disconnected mode?

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