Why it matters

Dedup shapes correctness. Understanding shapes design.

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The architecture

Message ID or hash.

Seen-set in fast store.

Skip if seen.

Dedup patternMessage ID / hashidentitySeen-setRedis / DBSkip if seenor process + recordKafka broker + Kinesis + SQS all at-least-once; dedup at consumer required
Dedup.
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How it works end to end

Redis SET for fast seen check.

TTL for seen entries.

Windowed dedup.

Content hash for equality.