// Hacker Noon · 22 April 2026

Exactly-Once in Spark Structured Streaming: What That Actually Means

"Exactly-once" in Spark Structured Streaming means each input record is processed once by Spark only if the source is replayable and the sink supports idempotent writes or transactions. Spark’s internal checkpointing ensures each micro-batch is executed once, but sinks (or custom write logic) can st...

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