I often have the case that I want to work on a SVN repository right away. But an ordinary git svn clone [url] also clones the entire history. So I want to speed
git svn fetch appears to "remember" the revisions it's seen previously. I've been having success with doing ranges:
git svn fetch -r 0:100
git svn fetch -r 100:200
git svn fetch -r 4500
git svn rebase
git svn fetch -r 200:300
I fetched the most recent revisions and then started "filling in" the gaps. It seems to work fine.
Jesper -- if your repository doesn't have a revision 1000, then there's nothing for it to fetch. Make sure the revision numbers you're using are valid!