apache/seatunnel · warning

Failed to update offset for skipped event

Error message

Failed to update offset for skipped event: {}

What it means

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.

Solutions

1. Find the full stack trace by temporarily raising log level for MySqlBinlogFetchTask to DEBUG/TRACE, since only e.getMessage() is logged.
2. Check binlog integrity with mysqlbinlog --verify-binlog-checksum on the affected file.
3. If offsets drift and duplicates/loss appear, restart the job from the last reliable checkpoint or snapshot.
4. Upgrade the connector if the cause is a known offset-bookkeeping bug.

// verify binlog integrity before/at the failing position
mysqlbinlog --verify-binlog-checksum mysql-bin.000123

try { offsetContext.completeEvent(); } catch (Exception e) { LOG.warn("Failed to update offset for skipped event: {}", e.getMessage(), e); /* include stack trace for diagnosis */ }

When it happens

Trigger: 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.

Common situations: 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.

Understand the failure class

Background: "This is a bug, please report it": internal invariant violations, unreachable panics, and SNH errors explained — this error's family across 47 libraries.

Related errors

• A deserialization failure event arrived
• Cannot read the binlog filename and position via
• Cannot read the binlog filename and position via
• Cannot read the binlog filename and position via
• Encountered change event

AI-assisted analysis of apache/seatunnel@cf67b549a7 (2026-09-10). Data as JSON: /api/errors/4b3c9d4c1d5ed54c. Report an issue: GitHub.

Appendix: source

Thrown at seatunnel-connectors-v2/connector-cdc/connector-cdc-mysql/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/mysql/source/reader/fetch/binlog/MySqlBinlogFetchTask.java:399

                            eventCount);
                    lastLoggedOffset = currentOffset;
                }
                lastLogTime = currentTime;
            }
        }

        private void updateOffsetPosition(
                MySqlOffsetContext offsetContext, EventHeader eventHeader) {
            try {
                if (eventHeader instanceof EventHeaderV4) {
                    EventHeaderV4 headerV4 = (EventHeaderV4) eventHeader;
                    offsetContext.setEventPosition(
                            headerV4.getPosition(), headerV4.getEventLength());
                }
                offsetContext.setBinlogServerId(eventHeader.getServerId());
                offsetContext.completeEvent();
            } catch (Exception e) {
                log.warn("Failed to update offset for skipped event: {}", e.getMessage());
            }
        }
    }

    /**
     * A bounded MySQL streaming change event source that stops at a specific offset. Used when
     * stop.mode = "specific" is configured.
     */
    private class BoundedMySqlStreamingChangeEventSource extends MySqlStreamingChangeEventSource {

        private final IncrementalSplit binlogSplit;
        private final JdbcSourceEventDispatcher<MySqlPartition> dispatcher;
        private final ErrorHandler errorHandler;
        private final Long targetTimestamp;
        private BoundedBinlogChangeEventSourceContext boundedContext;
        private long eventCount = 0;
        private long lastLogTime = System.currentTimeMillis();
        private static final long LOG_INTERVAL_MS = 10000;

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