Partial metadata rebuilding For highly active subversion repositories, it can be excruciatingly slow to pull updates one at a time from subversion. One way around this is to setup another mercurial repo that pulls new commits from svn periodicly (say every 5 minutes). When you want to update your repository, you can pull commits from this mercurial repository via native mercurial protocols, which will be much faster than pulling directly from svn. Unfortunately, your metadata will be out of date after doing so. Highly active repositories also tend to be very large, which means that it takes a long time to rebuild your metadata from scratch. To address this, this adds support to do a partial rebuild on the metadata by processing only revisions that have been added to the repository after the last revision we processed. With the rev map 1k revisions (~2 days) behind tip updatemeta is dramatically faster than rebuild meta: $ hg --time svn updatemeta Time: real 0.570 secs (user 0.480+0.000 sys 0.060+0.000) $ hg --time svn rebuildmeta Time: real 129.160 secs (user 128.570+0.000 sys 0.320+0.000)

SVN-fs-dump-format-version: 2

UUID: df2126f7-00ab-4d49-b42c-7e981dde0bcf

Revision-number: 0
Prop-content-length: 56
Content-length: 56

K 8
svn:date
V 27
2008-10-07T22:49:12.059692Z
PROPS-END

Revision-number: 1
Prop-content-length: 85
Content-length: 85

K 7
svn:log
V 11
Empty dirs.
K 8
svn:date
V 27
2008-10-07T22:49:41.118037Z
PROPS-END

Node-path: branches
Node-kind: dir
Node-action: add
Prop-content-length: 10
Content-length: 10

PROPS-END


Node-path: tags
Node-kind: dir
Node-action: add
Prop-content-length: 10
Content-length: 10

PROPS-END


Node-path: trunk
Node-kind: dir
Node-action: add
Prop-content-length: 10
Content-length: 10

PROPS-END


Revision-number: 2
Prop-content-length: 82
Content-length: 82

K 7
svn:log
V 9
Add alpha
K 8
svn:date
V 27
2008-10-07T23:23:02.991743Z
PROPS-END

Node-path: trunk/alpha
Node-kind: file
Node-action: add
Prop-content-length: 10
Text-content-length: 12
Text-content-md5: 3c72ebf8bbd7fa88b1fdcee5398b5a17
Text-content-sha1: f552a50b53177d35b29a4a0ab1cece918b5b5e9b
Content-length: 22

PROPS-END
file: alpha