Configure a NATS JetStream consumer's ReplayPolicy alongside DeliverPolicy to replay a stream at its original publish pace instead of as fast as possible
domain: nats · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Choose a DeliverPolicy to set the consumer's starting point in the stream, e.g. DeliverAll, DeliverNew, DeliverByStartSequence (requires OptStartSeq), or DeliverByStartTime (requires OptStartTime)
Separately set ReplayPolicy to ReplayInstant (default, delivers as fast as the client/AckPolicy/MaxAckPending allow) or ReplayOriginal (paces delivery to match the original publish-time intervals)
Create the consumer via the NATS CLI: `nats consumer add <stream> <consumer> --deliver all --replay original`
Confirm both fields on the consumer info output, since neither DeliverPolicy nor ReplayPolicy can be changed after creation
For a push consumer with a DeliverSubject, verify messages arrive spaced out at their original cadence when ReplayOriginal is set
If either policy needs to change later, delete and recreate the consumer rather than trying to edit it
Known gotchas
Both DeliverPolicy and ReplayPolicy are immutable once the consumer is created — there is no update path, only delete-and-recreate
DeliverByStartSequence/DeliverByStartTime fail without their companion field (OptStartSeq/OptStartTime) set
ReplayOriginal's pacing is most meaningful for push consumers; pull consumers already control their own pacing client-side via batch requests
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