Comment 16 for bug 461992

If pure upgrade is OOMing, then one option is to:

bzr init-repo --2a target
cd target
bzr branch ../source/trunk trunk -r 100
cd trunk
bzr pull -r 200
for i in `seq 300 $(bzr revno ../../source/trunk) 100`; do bzr pull -r $i; done

And have it do an incremental conversion. You'll probably want to run:

bzr pack

When everything has finished.