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What is a watermark in stream processing?

  1. A A heuristic indicating that events older than a threshold are unlikely to arrive
  2. B A data quality flag
  3. C A security token
  4. D A partition identifier
Answer

A heuristic indicating that events older than a threshold are unlikely to arrive

Watermarks let a windowed aggregation close and emit results despite the possibility of arbitrarily late events.

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