{"record":{"id":"4b3c9d4c1d5ed54c","repo":"apache/seatunnel","slug":"failed-to-update-offset-for-skipped-event","errorCode":null,"errorMessage":"Failed to update offset for skipped event: {}","messagePattern":"Failed to update offset for skipped event: (.+?)","errorType":"console","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"seatunnel-connectors-v2/connector-cdc/connector-cdc-mysql/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/mysql/source/reader/fetch/binlog/MySqlBinlogFetchTask.java","lineNumber":399,"sourceCode":"                            eventCount);\n                    lastLoggedOffset = currentOffset;\n                }\n                lastLogTime = currentTime;\n            }\n        }\n\n        private void updateOffsetPosition(\n                MySqlOffsetContext offsetContext, EventHeader eventHeader) {\n            try {\n                if (eventHeader instanceof EventHeaderV4) {\n                    EventHeaderV4 headerV4 = (EventHeaderV4) eventHeader;\n                    offsetContext.setEventPosition(\n                            headerV4.getPosition(), headerV4.getEventLength());\n                }\n                offsetContext.setBinlogServerId(eventHeader.getServerId());\n                offsetContext.completeEvent();\n            } catch (Exception e) {\n                log.warn(\"Failed to update offset for skipped event: {}\", e.getMessage());\n            }\n        }\n    }\n\n    /**\n     * A bounded MySQL streaming change event source that stops at a specific offset. Used when\n     * stop.mode = \"specific\" is configured.\n     */\n    private class BoundedMySqlStreamingChangeEventSource extends MySqlStreamingChangeEventSource {\n\n        private final IncrementalSplit binlogSplit;\n        private final JdbcSourceEventDispatcher<MySqlPartition> dispatcher;\n        private final ErrorHandler errorHandler;\n        private final Long targetTimestamp;\n        private BoundedBinlogChangeEventSourceContext boundedContext;\n        private long eventCount = 0;\n        private long lastLogTime = System.currentTimeMillis();\n        private static final long LOG_INTERVAL_MS = 10000;","sourceCodeStart":381,"sourceCodeEnd":417,"githubUrl":"https://github.com/apache/seatunnel/blob/cf67b549a7a6c35fa0beb12d83c62892427ea919/seatunnel-connectors-v2/connector-cdc/connector-cdc-mysql/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/mysql/source/reader/fetch/binlog/MySqlBinlogFetchTask.java#L381-L417","documentation":"In MySqlBinlogFetchTask.handleEvent, when an event is skipped the connector still tries to advance the offset (updateOffsetPosition: setEventPosition, setBinlogServerId, completeEvent). If any of that throws, the exception is swallowed and only its message logged at WARN — the event is consumed without a recorded offset update. Since this is a swallowed catch, the message text alone is the only clue.","triggerScenarios":"updateOffsetPosition throws inside handleEvent for a skipped event — e.g. offsetContext in an unexpected state, an event header (headerV4) field triggering arithmetic/validation failure, or a downstream assertion in the offset bookkeeping.","commonSituations":"Odd/partial binlog events (corrupt tail after crash); events of unusual types where event-length math is off; compatibility mismatches between the embedded Debezium offset context and the produced events.","solutions":["Find the full stack trace by temporarily raising log level for MySqlBinlogFetchTask to DEBUG/TRACE, since only e.getMessage() is logged.","Check binlog integrity with mysqlbinlog --verify-binlog-checksum on the affected file.","If offsets drift and duplicates/loss appear, restart the job from the last reliable checkpoint or snapshot.","Upgrade the connector if the cause is a known offset-bookkeeping bug."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"// verify binlog integrity before/at the failing position\nmysqlbinlog --verify-binlog-checksum mysql-bin.000123","typeGuard":null,"tryCatchPattern":"try { offsetContext.completeEvent(); } catch (Exception e) { LOG.warn(\"Failed to update offset for skipped event: {}\", e.getMessage(), e); /* include stack trace for diagnosis */ }","preventionTips":["Enable DEBUG logging for MySqlBinlogFetchTask when diagnosing, since only the message is logged by default.","Monitor checkpoint offsets for drift — swallowed offset failures can cause duplicates/loss.","Validate binlog files after server crashes before resuming CDC.","Keep connector and Debezium-compatible offsets in sync across upgrades."],"tags":["mysql","cdc","binlog","offset","logging"],"backgroundTag":"internal-invariant-violation","analyzedSha":"cf67b549a7a6c35fa0beb12d83c62892427ea919","analyzedAt":"2026-09-10T21:44:55.265Z","contentChangedAt":"2026-09-10T21:44:55.265Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}