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

[Markus Unterwaditzer <[e-mail]>]

Hello Fei, see my response to Lihui Sun.

On Mon, Dec 07, 2015 at 10:38:08AM +0800, Fei Song wrote:
> Hi Markus,
> 
> So, in remoteStorage, what should be stored at the both client and server side?
> Etags or metadata or metadata history or other things?
> based on the draft, it seems that only Etag is enough, but the context in this mailing list confused me...
> 
> 
> 
> 
> Fei Song
> 
> From: Markus Unterwaditzer
> Date: 2015-12-07 05:54
> To: Ted Lemon
> CC: storagesync
> Subject: Re: [Storagesync] Storagesync Digest, Vol 5, Issue 1
> Etags are *much* simpler to implement on the server side than the WebDAV sync
> protocol because they do not require the server to keep sync tokens and
> metadata history. Note that the server has to keep metadata of *deleted* files
> to correctly implement WebDAV's sync protocol. Etags are less efficient in
> terms of network usage of course, but that's the tradeoff to be made.
> 
> I don't know what you mean with the last sentence.
> 
> On Sun, Dec 06, 2015 at 06:26:54PM +0000, Ted Lemon wrote:
> > Sunday, Dec 6, 2015 12:39 PM Markus Unterwaditzer wrote:
> > > What do you mean by "it"? ETags are simpler to implement than the above RFC,
> > > and ETags are also required in WebDAV.
> > 
> > Etags are not really much simpler than a metadata versioning sync protocol, and they are a lot less efficient.   Having to fetch the whole directory for every directory that contains a change is expensive, both for the server and the client, unless changes are infrequent.   And because the server is the sole source of truth, it's a lot more fragile.
> > 
> > 
> > --
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> > 
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> 
> 
> 
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> 
> 
> 
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