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Exactly-Once Processing Semantics Across Kafka Consumer Groups : Retry, Timeout, and Circuit-Breaker Composition Failures
JavaKafkaPostgreSQLFlink
Problem Breakdown
The defect class here is composition: individually sensible timeouts, retries, and circuit breakers interact multiplicatively when layered across a call graph. A stream processor commits its consumer-group offset before its downstream side effect lands (or vice versa), so a rebalance or crash between the two events rep…
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