feat(sqs): add delivery mode for at-least-once and at-most-once reads - #124
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Divyanshu Tiwari (divyanshu-tiwari) merged 3 commits intoSep 15, 2026
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Default stays at-least-once so existing pipelines keep deferred ack. Opt into at-most-once to delete on receive when FIFO group throughput matters.
Divyanshu Tiwari (divyanshu-tiwari)
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September 15, 2026 13:43
… mode Tests that needed the interface are throwaway. Unknown delivery values fail in Init; empty defaults to at-least-once in the same switch.
Restore concurrent DeleteMessage for at-most-once by settling an ack immediately and handing it to the existing tracker, so concurrency still bounds in-flight deletes and the receive loop is not blocked on each RTT.
Mahesh Kamble (ma-gk)
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Sep 15, 2026
Divyanshu Tiwari (divyanshu-tiwari)
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September 15, 2026 14:14
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Summary
deliveryfield:at-least-once(default, current deferred-ack behavior) orat-most-once(delete on receive so FIFO groups are not blocked by downstream work).exactly-onceis reserved and rejected atInit; SQS cannot consume exactly-once.delivery: at-most-once.Test plan
deliveryfield still defersDeleteMessageuntil downstream finishes.delivery: at-most-onceon a FIFO reader and confirm receipts are deleted immediately and later messages in the group can be received while downstream is still running.delivery: exactly-onceand unknown values fail at startup.