{"record":{"id":"9177002a053e211d","repo":"apache/seatunnel","slug":"encountered-change-event-at-offset-for-tab","errorCode":null,"errorMessage":"Encountered change event '{}' at offset {} for table {} whose schema isn't known to this connector. One possible cause is an incomplete database history topic. Take a new snapshot in this case.{}The event will be ignored.{}Use the mysqlbinlog tool to view the problematic event: mysqlbinlog --start-position={} --stop-position={} --verbose {}","messagePattern":"Encountered change event '(.+?)' at offset (.+?) for table (.+?) whose schema isn't known to this connector\\. One possible cause is an incomplete database history topic\\. Take a new snapshot in this case\\.(.+?)The event will be ignored\\.(.+?)Use the mysqlbinlog tool to view the problematic event: mysqlbinlog --start-position=(.+?) --stop-position=(.+?) --verbose (.+?)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"seatunnel-connectors-v2/connector-cdc/connector-cdc-mysql/src/main/java/io/debezium/connector/mysql/MySqlStreamingChangeEventSource.java","lineNumber":773,"sourceCode":"            EventHeaderV4 eventHeader = event.getHeader();\n\n            if (inconsistentSchemaHandlingMode == EventProcessingFailureHandlingMode.FAIL) {\n                LOGGER.error(\n                        \"Encountered change event '{}' at offset {} for table {} whose schema isn't known to this connector. One possible cause is an incomplete database history topic. Take a new snapshot in this case.{}\"\n                                + \"Use the mysqlbinlog tool to view the problematic event: mysqlbinlog --start-position={} --stop-position={} --verbose {}\",\n                        event,\n                        offsetContext.getOffset(),\n                        tableId,\n                        System.lineSeparator(),\n                        eventHeader.getPosition(),\n                        eventHeader.getNextPosition(),\n                        offsetContext.getSource().binlogFilename());\n                throw new DebeziumException(\n                        \"Encountered change event for table \"\n                                + tableId\n                                + \" whose schema isn't known to this connector\");\n            } else if (inconsistentSchemaHandlingMode == EventProcessingFailureHandlingMode.WARN) {\n                LOGGER.warn(\n                        \"Encountered change event '{}' at offset {} for table {} whose schema isn't known to this connector. One possible cause is an incomplete database history topic. Take a new snapshot in this case.{}\"\n                                + \"The event will be ignored.{}\"\n                                + \"Use the mysqlbinlog tool to view the problematic event: mysqlbinlog --start-position={} --stop-position={} --verbose {}\",\n                        event,\n                        offsetContext.getOffset(),\n                        tableId,\n                        System.lineSeparator(),\n                        System.lineSeparator(),\n                        eventHeader.getPosition(),\n                        eventHeader.getNextPosition(),\n                        offsetContext.getSource().binlogFilename());\n            } else {\n                LOGGER.debug(\n                        \"Encountered change event '{}' at offset {} for table {} whose schema isn't known to this connector. One possible cause is an incomplete database history topic. Take a new snapshot in this case.{}\"\n                                + \"The event will be ignored.{}\"\n                                + \"Use the mysqlbinlog tool to view the problematic event: mysqlbinlog --start-position={} --stop-position={} --verbose {}\",\n                        event,\n                        offsetContext.getOffset(),","sourceCodeStart":755,"sourceCodeEnd":791,"githubUrl":"https://github.com/apache/seatunnel/blob/cf67b549a7a6c35fa0beb12d83c62892427ea919/seatunnel-connectors-v2/connector-cdc/connector-cdc-mysql/src/main/java/io/debezium/connector/mysql/MySqlStreamingChangeEventSource.java#L755-L791","documentation":"A change (DML) event arrived in the binlog for a table whose schema is not present in the connector's database history. With inconsistent.schema.handling.mode=warn, the event is logged with its offset and binlog coordinates and ignored; with fail it would stop the connector. This usually indicates the database history topic is incomplete relative to the binlog position being read.","triggerScenarios":"informAboutUnknownTableIfRequired, invoked from handleChange, finds the TableId missing from the in-memory schema (or its schema differs) while processing a binlog event, and inconsistentSchemaHandlingMode is WARN instead of FAIL.","commonSituations":"Database history topic was deleted/truncated or created with a shorter retention than the binlog; connector restarted from an old offset no longer covered by history; a table was dropped/recreated outside the observed window; Kafka history topic compaction removed records.","solutions":["Take a new snapshot (delete the connector offsets + history topic or set snapshot.mode=when_needed) so the schema history is rebuilt consistently","Check the database history topic (schema.history.internal.kafka.topic) for completeness/retention; restore or recreate it if truncated","Set schema.history.internal.skip.unparseable.ddl=false and inspect history-topic parse errors; fix the history reader","If ignoring unknown-table events is acceptable, keep inconsistent.schema.handling.mode=warn but monitor logs for data loss; otherwise set it to fail to surface problems immediately"],"exampleFix":"// before\n\"inconsistent.schema.handling.mode\": \"warn\"\n// after\n\"inconsistent.schema.handling.mode\": \"fail\"\n// plus: reset offsets and run snapshot.mode=when_needed to rebuild the history topic","handlingStrategy":"validation","validationCode":"// Before resuming from stored offsets, verify history coverage:\n// kafka-console-consumer --topic <schema.history.topic> --from-beginning | tail\n// confirm DDL for all captured tables exists and topic retention >= connector downtime","typeGuard":null,"tryCatchPattern":"try {\n    processChangeEvent(event);\n} catch (UnknownTableException e) {\n    // history incomplete: trigger a re-snapshot instead of silently dropping events\n    scheduleReSnapshot(e.getTableId());\n}","preventionTips":["Set inconsistent.schema.handling.mode=fail to surface schema gaps immediately","Protect the schema history topic from deletion, compaction loss, and short retention","Take a new snapshot whenever history and offsets may be out of sync","Keep schema changes tracked: avoid DDL on tables while connector offsets point before the DDL"],"tags":["mysql","cdc","schema","binlog"],"backgroundTag":"resource-not-found","analyzedSha":"cf67b549a7a6c35fa0beb12d83c62892427ea919","analyzedAt":"2026-09-10T21:44:55.265Z","contentChangedAt":"2026-09-10T21:44:55.265Z","schemaVersion":2},"datasetVersion":"2026-09-14T11:17:12.474Z"}