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Re: RFE: API for an efficient retrieval of server-side mergeinfo data

From: Doug Robinson <doug.robinson_at_wandisco.com>
Date: Fri, 21 Feb 2014 09:50:23 -0500

Julian:

Given the required RA protocol changes, when could this change be shipped?
 What version of SVN?

Thank you.

Doug

On Wed, Feb 19, 2014 at 10:06 AM, Julian Foad <julianfoad_at_btopenworld.com>wrote:

> Marc Strapetz wrote:
> > Julian Foad wrote:
> >> It looks like we have an agreement in principle. Would you like to file
> an
> >> enhancement issue?
> >
> > Great. I've filed an issue now:
> >
> > http://subversion.tigris.org/issues/show_bug.cgi?id=4469
> >
> > Would you please review the various attributes (Subcomponent, ...)?
>
> That's great, thanks. I added a reference to this email thread, added
> myself to the CC list, and tweaked the type from 'feature' to 'enhancement'
> (just my personal interpretation) and schedule from '---' to 'unscheduled'
> (which just indicates I've thought about it and am stating that it's not
> currently tied to any particular release, it doesn't mean it has to stay
> that way).
>
> I talked with Brane about this and we discussed how it might make more
> sense to do a higher level API. Instead of asking "what is the absolute
> difference in the mergeinfo representations?" it could ask "What merges and
> other interesting events have occurred in the lifetime of this path?".
> There are a couple of reasons.
>
> The API as sketched so far is pretty straightforward, but even so the
> effort needed to implement it is not trivial. It requires RA protocol
> changes as well as all the layers of API change. The mergeinfo
> representation is subject to change. It feels like a backward step to
> invest effort in adding more support that is tied specifically to the
> current format.
>
> SmartSVN and other front ends like to be able to draw a merge graph. Even
> the 'svn mergeinfo' command-line command now draws a little ASCII-art graph
> showing limited information about the most recent merge. At present they
> all have to interpret mergeinfo themselves, at a pretty low level, and the
> interpretation is subtle and poorly understood. (I don't understand the
> edge cases related to adds and deletes properly, and I've been working with
> it for years.)
>
> So it seems like a good idea to encapsulate the interpretation of
> mergeinfo a bit more, and expose data in a form that is geared specifically
> towards explaining the history in the way that users can understand it.
> Maybe think of it as an extended 'log' operation, adding a small number of
> new notification types such as:
>
> * there is a full merge into here, bringing in all the new changes
> from PATH up to REV;
> * there is a partial merge to here, bringing in some changes
> from PATH between REV1 and REV2;
>
> What do you think of that sort of interface? Does your code already
> calculate something like that?
>
> - Julian
>
>

-- 
Douglas B. Robinson | *Senior Product Manager*
WANdisco // *Non-Stop Data*
t. 925-396-1125
e. doug.robinson_at_wandisco.com
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Received on 2014-02-21 15:51:00 CET

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