[tahoe-dev] weekly Tahoe dev call report: 2012-07-10

[Terrell Russell]

On Wed, Jul 11, 2012 at 11:17 AM, Brian <warner at lothar.com> wrote:
> davidsarah: hm, now I'm not sure that it'd be safe to restore a stale
> leasedb from a backup: I'm thinking of a sequence where:
>
>  1: there's a soon-to-expire lease on a share
>  2: a backup snapshot is taken
>  3: someone adds a long-to-expire lease
>  4: leasedb is lost
>  5: leasedb is restored from the backup snapshot
>  6: the short lease expires, share deleted
>  7: the long lease is still valid
>
> So maybe backups *aren't* appropriate, or at least when we restore from
> a backup, we should still add starter leases to all shares (but also
> preserve the leases from the backup, for accounting purposes).
>
>
> cheers,
>  -Brian

Leases are per-share?  And not per file...  so "#6, share deleted" is
still only 1 of N being deleted...

Are leases (across the N servers) managed independently enough that a
repairer would be able to recover lost shares?

Terrell