feat: add exactly once semantics for apoc based cdc handlers#504
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feat: add exactly once semantics for apoc based cdc handlers#504
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fbiville
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Feb 9, 2026
sink/src/main/kotlin/org/neo4j/connectors/kafka/sink/strategy/cdc/apoc/ApocCdcHandler.kt
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sink/src/test/kotlin/org/neo4j/connectors/kafka/sink/strategy/TestUtils.kt
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.../test/kotlin/org/neo4j/connectors/kafka/sink/strategy/cdc/apoc/ApocCdcSchemaHandlerTaskIT.kt
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.../test/kotlin/org/neo4j/connectors/kafka/sink/strategy/cdc/apoc/ApocCdcSchemaHandlerTaskIT.kt
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dhrudevalia
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Feb 9, 2026
sink/src/main/kotlin/org/neo4j/connectors/kafka/sink/strategy/cdc/apoc/ApocCdcHandler.kt
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.../test/kotlin/org/neo4j/connectors/kafka/sink/strategy/cdc/apoc/ApocCdcSchemaHandlerTaskIT.kt
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...est/kotlin/org/neo4j/connectors/kafka/sink/strategy/cdc/apoc/ApocCdcSourceIdHandlerTaskIT.kt
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fbiville
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Feb 9, 2026
Co-Authored-By: Florent Biville <florent.biville@neo4j.com> Co-Authored-By: Dhru Devalia <dhru.devalia@neo4j.com> # Conflicts: # sink/src/test/kotlin/org/neo4j/connectors/kafka/sink/strategy/cdc/apoc/ApocCdcSchemaHandlerTaskIT.kt # sink/src/test/kotlin/org/neo4j/connectors/kafka/sink/strategy/cdc/apoc/ApocCdcSourceIdHandlerTaskIT.kt
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This PR adds a new offset tracking mechanism to APOC based CDC sink handlers so that the database changes for every incoming message is executed only once, allowing non-idempotent changes to be handled even when delivered more than once.
This is an opt-in configuration which needs to be activated by setting
neo4j.eos-offset-labelconfiguration to a desired offset tracking label, which should also have a corresponding key constraint defined on it, i.e.For
neo4j.eos-offset-label=__KafkaOffset, the following constraint needs to be created:CREATE CONSTRAINT kafka_offset_key FOR (n:__KafkaOffset) REQUIRE (n.strategy, n.topic, n.partition) IS KEY