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Exactly-Once Processing Semantics Across Kafka Consumer Groups : Cold-Path Replay and Backfill Correctness
JavaKafkaPostgreSQLFlink
Problem Breakdown
The vulnerable surface is the cold path: replay, backfill, and migration jobs that process historical data at scale, which every production system runs but almost none tests. A stream processor commits its consumer-group offset before its downstream side effect lands (or vice versa), so a rebalance or crash between the…
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