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

Jakub Moscicki <Jakub.Moscicki@cern.ch> Thu, 03 December 2015 18:42 UTC

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From: Jakub Moscicki <Jakub.Moscicki@cern.ch>
To: Ted Lemon <mellon@fugue.com>
Thread-Topic: [Storagesync] Storagesync Digest, Vol 5, Issue 1
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Subject: Re: [Storagesync] Storagesync Digest, Vol 5, Issue 1
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> Thursday, Dec 3, 2015 6:00 AM Linhui Sun wrote:
>> However I'd prefer HTTP rather than WebDAV. Since I still think WebDAV is
>> not suitable for today's sync service. The frequency of operations is far
>> higher than what WebDAV expects. For example, frequently sending propfind
>> to detect changes is not a good way in my view.
> 
> WebDAV is HTTP.   However, your point about propfind is correct--that doesn't scale.   

Could you please explain why you think it does not scale? There are schemes in which you do not need to propfind the entire remote tree to discover changes, only a sequence of propfinds in a direct path leading to a changed entity. That’s not optimal for sure (several calls needed, depending on the depth of the change) but if it comes to WebDAV itself, apart from a bloated XML representation, I do not see much problem.

> What you want is a separate layer for dealing with synchronization of metadata.   You could use HTTP transport to do this, but not propfind.

Okey, but what you need to remember the client state and pass it on to the server to calculate the diff state. Any good ideas how to do that?

kuba

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