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RE: Re: [DESIGN] mtime versioning - was: Getting Bug 1256 fixed

From: Thompson, Graeme (AELE) <Graeme.Thompson_at_smiths-aerospace.com>
Date: 2005-11-28 10:36:59 CET

Storage:
I would want the modification time stored for every revision.

Would this property be stored within the Berkley DB? If so then wouldn't
this be compressed like the rest of the database? - on my project the
files when exported are approx 500Mb and the repository size on the
initial import was 139Mb, thus it must have been compressed.

If space is an issue then adding a configuration option to only store
the latest modification time would solve this.

As a general rule it is always worth storing the information by default
and then letting the user specify that they do not want it stored.

Graeme

-----Original Message-----
From: Ph. Marek [mailto:philipp.marek@bmlv.gv.at]
Sent: 28 November 2005 08:59
To: Jim Blandy
Cc: users@subversion.tigris.org; Mark Phippard;
dev@subversion.tigris.org
Subject: Re: [DESIGN] mtime versioning - was: Getting Bug 1256 fixed

On Monday 28 November 2005 09:42, Jim Blandy wrote:
> It's late, so please be patient, but:
>
> Wouldn't it make sense to separate the issue of whether we record the
> file's modification time when it goes into the repository from whether

> we restore it on the way out?
>
> I'd expect that we would always want to record the modtime in the
> repository --- why throw away information?
>
> But whether we want to restore the modtime when we update depends on
> how we use modtimes in our working copy. Restoring modtimes could
> confuse 'make' pretty badly.
The problems with this approach are
- bandwidth
- space on harddisk - this is *currently* important! A wc with 1000
files
  with no properties other than svn:text-time on a 4kB filesystem needs
  1000 * 2 * 4k ~ about 8MByte *only for this properties*!
  Now go to a wc with 100000 files ... and 800M are gone.
  Although matters are progressing on this front.
- with the current patches there's a chance of conflicts in the
property.
  If I dig out the old version and look there this could be avoided -
there
  was a special case to take the newer of two dates.

And in the patches as they are the existence is the flag if it should be
restored or not ... although that could be solved with another
flag-property like "svn:special".

BTW, a question just pops up in my head: if a property's name is used
for many files, is the name in the repository just stored once, with
pointers to it, or are there N copies?

Regards,

Phil

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Received on Mon Nov 28 10:42:20 2005

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