Comment 3 for bug 376748

well, it depends on how you layer the 'commit_write_groups'. InterDifferingSerializer holds a write group across 100 revs, which causes autopack to occur every 1000 revs. If, instead, you hold the write group across all 50k revs, then yes, things will be bad.

In fact, I think under those circumstances it could expand all texts to fulltexts. It sort of depends what gets put into a single stream. (A group only survives a single 'insert_record_stream', so calling VF.add_lines() repeatedly will give all fulltexts.)