davicintra / writing

#distributed-systems

  1. 5ced4426 min

    A payment slip with its slip number and a barcode, stamped PAID in green twice, the two identical stamps side by side at different angles.

    The bill arrived twice. You should still pay it once.

    Duplicate messages are normal, even from a bank. Whoever moves the money has to catch them, and sometimes that's a vendor you can't see into.