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Re: [PATCH] Add a test in dav-mirror-autocheck.sh to showcase a out-of-date slave related bug

From: Kamesh Jayachandran <kamesh_at_collab.net>
Date: Tue, 19 Apr 2011 21:31:58 +0530

On 04/19/2011 07:44 AM, Mark Phippard wrote:
> On Mon, Apr 18, 2011 at 7:41 AM, Daniel Shahaf<d.s_at_daniel.shahaf.name> wrote:
>> On Mon, 18 Apr 2011 07:08 -0400, "Mark Phippard"<markphip_at_gmail.com> wrote:
>>> I know why it fails, but I would not expect it to fail as a user, even
>>> with a proxy. I did not look at Arwin's test but it does not require
>>> a WC to show the failure. This also fails:
>>> $ svn mkdir url://branches/branch1
>>> $ svn mkdir url://branches/branch2
>> Because in the second mkdir, the slave's idea of HEAD is behind master's and user's idea of HEAD.
> As I said, I know why it fails. That does not mean we should not
> identify these problems and look for ways to solve them. If proxy was
> a first class feature it would know you were running a command where
> the all of the HTTP requests should be proxied and this would not
> fail.
>> I agree it would be nice if this worked, but given that we have to remain sane to people who open an RA session to the slave before it has
>> synced up I'm afraid it might be tricky to address. (That corresponds to the case of concurrent commits --- two people attempting Mark's two
>> mkdirs concurrently.)
>> Separately: we might want to teach the wc that one repos_url (out of several with the same repos_uuid) is preferred in given circumstances...
>> then we could have '^mirror/' and '^master/' syntaxes.</random-thoughts>
> To reiterate, there is no WC involved here. So a change like that is
> not needed. This problem exists with commands that are run on URL's
> alone. As you know most of our SVN commands involved many HTTP
> requests and the problem here is that some of them are handled by the
> proxy and others are proxied to the master. A solution would likely
> require the proxy to have more awareness of the SVN command being
> executed so that it knew to proxy all of the requests back to the
> master rather than handle any of them off the local replica.

FWIW at [1] I originally sent a patch which would provide a RA API to
set a request header 'SVN-ACTION' indicating high level svn operation.

[1] http://svn.haxx.se/dev/archive-2010-01/0101.shtml

With regards
Kamesh Jayachandran
Received on 2011-04-19 17:59:40 CEST

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