Re: [Storagesync] Storagesync Digest, Vol 5, Issue 1

[Markus Unterwaditzer <[e-mail]>]

On Mon, Dec 07, 2015 at 09:09:08AM +0800, Linhui Sun wrote:
> 2015-12-07 8:54 GMT+08:00 Markus Unterwaditzer <[e-mail]>:
> 
> > On Mon, Dec 07, 2015 at 08:50:00AM +0800, Linhui Sun wrote:
> > > But what if the file has been changed during two sync processes by
> > another
> > > participant who also shares the file.
> >
> > Those are sync conflicts, how to deal with then depends on the kind of
> > data you
> > deal with.
> >
> That works, but do you think this could make the things complicated? It
> sounds like different situations have different mechanisms. Why not just
> make the metadata exchanged, any disadvantage for doing that?

I don't know what that means.

> 
> >
> > >
> > > >
> > > > On Mon, Dec 07, 2015 at 08:17:26AM +0800, Linhui Sun wrote:
> > > > > On 周一, 12月 7, 2015 at 01:36, Markus Unterwaditzer <
> > [e-mail]>
> > > > > wrote:
> > > > > > IMO, etag is designed for client side cache. A typical usage: if
> > the file
> > > > > > on the server has no actual change, the client will use the cache
> > and the
> > > > > > server does not need to send the file content again. While for a
> > storage
> > > > > > service, we also need some some similar mechanism at server side.
> > In this
> > > > > > way, the client do not need to upload unchanged content to the
> > server.
> > > > >
> > > > > There is no "true-and-only" usecase for etags, and no, you do not
> > need
> > > > anything
> > > > > more than etags for synchronization. Using a additional "metadata"
> > file, the
> > > > > client can cheaply determine whether local content changed and
> > whether
> > > server
> > > > > content changed, and that's all that is required for (in this case)
> > file
> > > > > synchronization. Sync conflicts are a different story, and the
> > solution to
> > > > that
> > > > > heavily depends on the kind of data you're syncing. I'm a little bit
> > > confused
> > > > here: if I have a metadata file, why do I still need
> > > > > the etag? The metadata file should contain something equivalent to
> > the etag.
> > > > >
> > > > > >
> > > > > > > --
> > > > > > > Sent from my phone. Please excuse my brevity.
> > > > > > >
> > > > > > > _______________________________________________
> > > > > > > Storagesync mailing list
> > > > > > > [e-mail]
> > > > > > > https://www.ietf.org/mailman/listinfo/storagesync
> > > > > > >
> > > > >
> > > > > > _______________________________________________
> > > > > > Storagesync mailing list
> > > > > > [e-mail]
> > > > > > https://www.ietf.org/mailman/listinfo/storagesync
> > > >
> > > > > _______________________________________________
> > > > > Storagesync mailing list
> > > > > [e-mail]
> > > > > https://www.ietf.org/mailman/listinfo/storagesync
> >

> _______________________________________________
> Storagesync mailing list
> [e-mail]
> https://www.ietf.org/mailman/listinfo/storagesync