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Vol. I · No. 251
Mon · 8 Jun
A Daily Lexicon of Trustworthy Data
The Lexicon

005·75

exactly-once

/ɪɡ.ˈzækt.li wʌns/ - adj.

1 [colloq.] A guarantee printed on the slide and approximated in the system.Keep. Punchy.This is the problem.

Working definition

2. A delivery guarantee that each event is processed one time and one time only, with no loss and no duplication, typically requiring coordinated state and deduplication.

Filed
See also
  • dead-letter queueWhere the records that could not be processed go to be inspected, in the same sense that a junk drawer is a filing system.
  • idempotencyThe property everyone assumed the job had until the day it ran twice.
  • stream processingReal-time delivery of a number no downstream meeting is scheduled to act on for another quarter.