apache/seatunnel · warning

Error while deserializing binlog event at offset {}.{}This e

Error message

Error while deserializing binlog event at offset {}.{}This exception will be ignored and the event be skipped.{}Use the mysqlbinlog tool to view the problematic event: mysqlbinlog --start-position={} --stop-position={} --verbose {}

What it means

The MySQL binlog client failed to deserialize a binlog event at a given offset. With event.deserialization.failure.handling.mode=warn, the connector logs this warning including the binlog file/position, skips the event, and continues streaming rather than failing the connector.

Source

Thrown at seatunnel-connectors-v2/connector-cdc/connector-cdc-mysql/src/main/java/io/debezium/connector/mysql/MySqlStreamingChangeEventSource.java:525

                                    .getEventHeader(); // safe cast, instantiated that ourselves

            // logging some additional context but not the exception itself, this will happen in
            // handleEvent()
            if (eventDeserializationFailureHandlingMode
                    == EventProcessingFailureHandlingMode.FAIL) {
                LOGGER.error(
                        "Error while deserializing binlog event at offset {}.{}"
                                + "Use the mysqlbinlog tool to view the problematic event: mysqlbinlog --start-position={} --stop-position={} --verbose {}",
                        offsetContext.getOffset(),
                        System.lineSeparator(),
                        eventHeader.getPosition(),
                        eventHeader.getNextPosition(),
                        offsetContext.getSource().binlogFilename());

                throw new RuntimeException(data.getCause());
            } else if (eventDeserializationFailureHandlingMode
                    == EventProcessingFailureHandlingMode.WARN) {
                LOGGER.warn(
                        "Error while deserializing binlog event at offset {}.{}"
                                + "This exception will be ignored and the event be skipped.{}"
                                + "Use the mysqlbinlog tool to view the problematic event: mysqlbinlog --start-position={} --stop-position={} --verbose {}",
                        offsetContext.getOffset(),
                        System.lineSeparator(),
                        System.lineSeparator(),
                        eventHeader.getPosition(),
                        eventHeader.getNextPosition(),
                        offsetContext.getSource().binlogFilename(),
                        data.getCause());
            }
        } else {
            LOGGER.error("Server incident: {}", event);
        }
    }

    /**
     * Handle the supplied event with a {@link RotateEventData} that signals the logs are being

View on GitHub (pinned to cf67b549a7)

Solutions

1. Inspect the problematic event with: mysqlbinlog --start-position=<pos> --stop-position=<pos> --verbose <binlog-file> and assess data loss
2. Verify binlog integrity on the server (SHOW BINARY LOGS; mysqlbinlog --verify-binlog-checksum) and if corrupt, restart streaming from a clean earlier position/GTID
3. Upgrade the Debezium/connector version so it supports the source MySQL's event format
4. If losing events is unacceptable, set event.deserialization.failure.handling.mode=fail so the connector stops instead of silently skipping

Example fix

// before
"event.deserialization.failure.handling.mode": "warn"
// after
"event.deserialization.failure.handling.mode": "fail"

// Pre-checks before streaming:
// SHOW VARIABLES LIKE 'binlog_format'; -- must be ROW
// SHOW VARIABLES LIKE 'binlog_checksum'; -- match connector expectation
// SELECT @@version; -- ensure connector supports this MySQL version

// In the pipeline around the CDC consumer:
try {
    processChangeEvents(stream);
} catch (DebeziumException | RuntimeException e) {
    if (isBinlogDeserializationIssue(e)) {
        logBinlogPositionAndDecideSkipOrFail(e); // inspect with mysqlbinlog
    } else {
        throw e;
    }
}

When it happens

Trigger: handleServerIncident in execute() receives an EventDeserializer.DeserializationException while EventDeserializationFailureHandlingMode is WARN; the raw binlog bytes for the event could not be parsed (truncated/corrupt binlog, unknown event type from a newer MySQL, or mid-event restart).

Common situations: Server crash or unclean shutdown left a partially written binlog event; replicating from a MySQL version whose new event types the bundled Debezium can't parse; binlog file rotated/truncated externally; reading binlogs copied with checksums mismatched.

Understand the failure class

Background: "failed to unmarshal" / json.Unmarshal errors: why parsing a response into a Go struct fails and how to fix it — this error's family across 23 libraries.

Related errors

• A deserialization failure event arrived
• Unexpected error while connecting to MySQL and looking at gt
• Unexpected error while connecting to MySQL and looking for b
• Unexpected error while connecting to MySQL and looking at BI
• Unexpected error while connecting to MySQL and looking at BI

AI-assisted analysis of apache/seatunnel@cf67b549a7 (2026-09-10). Data as JSON: /api/errors/e798b9680677a559. Report an issue: GitHub.