git svn hangs on a rebase or clone when presented with a large commit.

I have to use git svn to pull from a subversion repository in a local git 
repository.  I don't have any local subversion repositories to debug the 
problem that I will describe below.

I do a git svn clone (or if I've already done a clone an git svn rebase) from 
the repository.   There is one particular subversion commit that is quite 
large  (revision 15300).   Anyway both the git svn clone  and the git svn 
rebase commands hang.

     ...  - r15259 - r15300 - r15301 - ...

I know there are commits in the subversion repoistory beyond the bad 
repository and I would like to be able do manually what git svn rebase would 
do with the commit and then be able to run git svn rebase to get revisions 
15301 and following.

Are the steps necessary to manually fetch 15300 so that I don't screw up 
future git svn rebase commands documented?