{"record":{"id":"ddbebf21683a8a59","repo":"apache/seatunnel","slug":"a-deserialization-failure-event-arrived","errorCode":null,"errorMessage":"A deserialization failure event arrived","messagePattern":"A deserialization failure event arrived","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"seatunnel-connectors-v2/connector-cdc/connector-cdc-mysql/src/main/java/io/debezium/connector/mysql/MySqlStreamingChangeEventSource.java","lineNumber":1571,"sourceCode":"            try {\n                // Stop BinaryLogClient background threads\n                client.disconnect();\n            } catch (final Exception e) {\n                LOGGER.debug(\"Exception while closing client\", e);\n            }\n            errorHandler.setProducerThrowable(wrap(ex));\n        }\n\n        @Override\n        public void onEventDeserializationFailure(BinaryLogClient client, Exception ex) {\n            if (eventDeserializationFailureHandlingMode\n                    == EventProcessingFailureHandlingMode.FAIL) {\n                LOGGER.debug(\"A deserialization failure event arrived\", ex);\n                logStreamingSourceState();\n                errorHandler.setProducerThrowable(wrap(ex));\n            } else if (eventDeserializationFailureHandlingMode\n                    == EventProcessingFailureHandlingMode.WARN) {\n                LOGGER.warn(\"A deserialization failure event arrived\", ex);\n                logStreamingSourceState(Level.WARN);\n            } else {\n                LOGGER.debug(\"A deserialization failure event arrived\", ex);\n                logStreamingSourceState(Level.DEBUG);\n            }\n        }\n    }\n\n    @FunctionalInterface\n    private interface TableIdProvider<E extends EventData> {\n        TableId getTableId(E data);\n    }\n\n    @FunctionalInterface\n    private interface RowsProvider<E extends EventData, U> {\n        List<U> getRows(E data);\n    }\n}","sourceCodeStart":1553,"sourceCodeEnd":1589,"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#L1553-L1589","documentation":"The binlog client delivered an EventDeserializer.DeserializationException event to the connector. The message is logged at WARN, DEBUG, or ERROR depending on event.deserialization.failure.handling.mode; in FAIL mode the error handler's producer throwable is set (connector stops), in WARN mode streaming continues, otherwise it is logged at DEBUG.","triggerScenarios":"execute()'s event loop receives a deserialization exception from the binlog client; handling mode is FAIL (stops via errorHandler.setProducerThrowable), WARN (continues), or default/other (debug log) — all paths log 'A deserialization failure event arrived'.","commonSituations":"Truncated binlogs after a server crash; binlog events written by a newer MySQL version than the connector supports; corrupted binlog transfer over network; reading GTID ranges spanning incompatible servers.","solutions":["Inspect the wrapped exception and use mysqlbinlog --start-position/--stop-position --verbose on the reported file/position to examine the event","Upgrade the Debezium-based connector version to match or exceed the source MySQL version","If the binlog is corrupt, restart streaming from a clean earlier offset/GTID or re-snapshot","Decide the desired policy: set event.deserialization.failure.handling.mode=fail to stop on bad events, or warn to skip them (risk of data loss)"],"exampleFix":"// before\n\"event.deserialization.failure.handling.mode\": \"warn\"\n// after (stop instead of silently skipping unreadable events)\n\"event.deserialization.failure.handling.mode\": \"fail\"","handlingStrategy":"try-catch","validationCode":"// Before streaming:\n// SELECT @@version; -- connector Debezium must support this MySQL version\n// mysqlbinlog --verify-binlog-checksum <file>; -- binlog integrity","typeGuard":null,"tryCatchPattern":"try {\n    handleEvent(deserialized);\n} catch (DeserializationException ex) {\n    switch (failureMode) {\n        case FAIL: errorHandler.setProducerThrowable(wrap(ex)); break;\n        case WARN: logAndSkip(ex); break;\n        default:   logDebugAndSkip(ex); break;\n    }\n}","preventionTips":["Choose event.deserialization.failure.handling.mode deliberately (fail vs warn)","Upgrade connector when the MySQL server is upgraded (new event types)","Guard against unclean server shutdowns; verify binlogs after crashes","Monitor the frequency of deserialization-failure events as a data-loss signal"],"tags":["mysql","cdc","binlog","deserialization"],"backgroundTag":"json-unmarshal-failed","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"}