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Re: svn commit: r1242958 - /subversion/trunk/subversion/libsvn_repos/log.c

From: Hyrum K Wright <hyrum.wright_at_wandisco.com>
Date: Fri, 10 Feb 2012 16:33:48 -0600

On Fri, Feb 10, 2012 at 4:24 PM, Bert Huijben <bert_at_qqmail.nl> wrote:
>> -----Original Message-----
>> From: hwright_at_apache.org [mailto:hwright_at_apache.org]
>> Sent: vrijdag 10 februari 2012 23:11
>> To: commits_at_subversion.apache.org
>> Subject: svn commit: r1242958 -
>> /subversion/trunk/subversion/libsvn_repos/log.c
>> Author: hwright
>> Date: Fri Feb 10 22:10:34 2012
>> New Revision: 1242958
>> URL: http://svn.apache.org/viewvc?rev=1242958&view=rev
>> Log:
>> Older (pre-1.6) revision files don't contain the information to fully populate
>> the changed_path hash for 'log -v' and 'log --xml'.  If we encounter such a
>> condition, fetch the kind manually.
> Why do we add this now?
> We started sending the information 'when available' with 1.6, and I think we didn't retrieve the data for performance reasons. Did something change?

User request (through private channels). They were parsing the output
of 'log --xml' which shows a blank 'kind' attribute against these old
revisions. Fetching the kind as part of the log is much easier, both
for the user and for performance, than individually running 'svn info'
on each node.

Arguably, they could cache this information somewhere client-side,
since the historic information isn't going to change. But that's what
the VCS is for in the first place.

> This might be quite a performance regression for 'svnadmin upgrade'-d servers that were from <=1.5 before the last dump-load and it won't make the information magically available on clients, because there is no requirement to upgrade the server.

Possibly, but I think we already say that running 'log -v' may take a
while longer than "normal" log. I also think the number of such
instances likely to be encountered in the wild are few, and the
benefits to those that do want this information outweigh the costs.


uberSVN: Apache Subversion Made Easy
Received on 2012-02-10 23:34:20 CET

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