Yeah, that's what I ended up doing.
Originally, I was doing this:
1. Sending 20 books per job but before the job finished,
2. Send another 20 to 50 to 100.
Eventually some error happened.
Instead, what I did this time was send between 20 to 70 books each job and wait for the job to finish before I put another job in the queue. Using this approach, it seemed like there were no errors.
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