Re: [Gluster-devel] Files erased while one brick was down in AFR returns from the afterlife

[Anand Avati]

Daniel,
 Nice suggestion! versioning directories makes sense. Each subdirectory can
be treated a seperate 'problem' and be solved nicely. a given directory's
version will only imply existance or non-existance of its subdirectory, and
not the contents of the subdirectory. I dont see why it can get messy? This
will (if at all) get into the first release post 1.3-STABLE.

thanks,
avati

2007/7/3, Daniel van Ham Colchete <address@hidden>:
> Hi Krishna!
>
> On 7/2/07, Krishna Srinivas <address@hidden> wrote:
> >
> > Hi Daniel,
> >
> > That case is not handled yet because of lack of time. Since its
> > not a risky thing to bring back a deleted file, it is in the TODO list
> > and yet to be fixed.
>
>
> I know I'm not doing anything to solve the problem but this "not a risky"
> unfortunately does not apply to me... One of the things I'll be doing with
> GlusterFS is hosting e-mails. If I have to put one of the bricks in
> maintenance (kernel/security update or something else) them every e-mail
> downloaded or deleted by my users will reappear.
>
> But if this will delay the release of version 1.3 them I also think it's
> in
> the best interest of the project to delay this fix...
>
> I'm a little bit worried because GlusterFS is, by far, the best option for
> every storage application I need (email, a parallel database I'm planing,
> web host, etc...), and soon (a few days) I'll be in production...
>
> Versioning the directory is an option. Other things we can do -
> > journal the deletion or bring namespace awareness to AFR.
>
>
> Thinking about my suggestion after sending the e-mail, I though that
> versioning the directory might not be the best option. When I started
> thinking about directory/subdirectories deletion/recreation things got too
> ugly and the beautiful simplicity of GlusterFS was lost.
>
> IMO namespace awareness to the AFR might bring a "chicken and the egg"
> problem when planing to have no single point of failure in the project.
> Can
> we use AFR to mirror the AFR's namespace? If yes, wouldn't it bring the
> same
> problem?
>
> Journaling seems nice, but who reads the journal? And when? Where would it
> be written? To every answer of those question I can think of performance
> and
> other problems the would arise...
>
> This really requires a lot of thinking and also requires a lot more
> understanding of everyone's storage needs than I have. I'm deeply sorry I
> can't suggest a solution for you. May be I'm so tied to the problem that I
> can't see the solution :).
>
> Krishna
> >
> >
> When you start working with this, please let-me know.
>
> Best regards,
> Daniel
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--
Anand V. Avati