MichelDiz commented :
Wow, that’s huge! Do you have more than 2⁶⁴ entities?
if each byte you have has it’s own UID. So you have about 12 billion UIDs to lease. This is less than 0,00001% of uids available. (I can be wrong by 1± zero, for more or for less)
I tried hitting the lease endpoint with a really large number, but it still leases out only a small number
You can hit N times you want that endpoint. With big numbers. The lease will grow.
BTW, you should use Bulkloader instead.
Cheers.
UPDATE:
As you can do a “hash” of the id from your dataset. You can create unique Blank-nodes tho. Just add _: in front your hash and you’re done. No need to do UID lease manually.