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Exactly-Once Processing Semantics Across Kafka Consumer Groups : State Divergence and Merge Integrity Under Concurrent Writers
JavaKafkaPostgreSQLFlink
Problem Breakdown
The fundamental defect is that shared mutable state is updated by concurrent writers whose operations are only serialized after the fact, at reconciliation time. 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 r…
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