{"record":{"id":"c7693dfe8ba82646","repo":"apache/seatunnel","slug":"unable-to-parse-unsupported-lob-write-sql-sql","errorCode":null,"errorMessage":"Unable to parse unsupported LOB_WRITE SQL: ${sql}","messagePattern":"Unable to parse unsupported LOB_WRITE SQL: (.+?)","errorType":"exception","errorClass":"DebeziumException","httpStatus":null,"severity":"error","filePath":"seatunnel-connectors-v2/connector-cdc/connector-cdc-oracle/src/main/java/io/debezium/connector/oracle/logminer/processor/AbstractLogMinerEventProcessor.java","lineNumber":1125,"sourceCode":"    private static Pattern LOB_WRITE_SQL_PATTERN =\n            Pattern.compile(\n                    \"(?s).* := ((?:HEXTORAW\\\\()?'.*'(?:\\\\))?);\\\\s*dbms_lob.write\\\\([^,]+,\\\\s*(\\\\d+)\\\\s*,\\\\s*(\\\\d+)\\\\s*,[^,]+\\\\);.*\");\n\n    /**\n     * Parses a {@code LOB_WRITE} operation SQL fragment.\n     *\n     * @param sql sql statement\n     * @return the parsed statement\n     * @throws DebeziumException if an unexpected SQL fragment is provided that cannot be parsed\n     */\n    private ParsedLobWriteSql parseLobWriteSql(String sql) {\n        if (sql == null) {\n            return null;\n        }\n\n        Matcher m = LOB_WRITE_SQL_PATTERN.matcher(sql.trim());\n        if (!m.matches()) {\n            throw new DebeziumException(\"Unable to parse unsupported LOB_WRITE SQL: \" + sql);\n        }\n\n        String data = m.group(1);\n        if (data.startsWith(\"'\")) {\n            // string data; drop the quotes\n            data = data.substring(1, data.length() - 1);\n        }\n        int length = Integer.parseInt(m.group(2));\n        int offset = Integer.parseInt(m.group(3)) - 1; // Oracle uses 1-based offsets\n        return new ParsedLobWriteSql(offset, length, data);\n    }\n\n    private class ParsedLobWriteSql {\n        final int offset;\n        final int length;\n        final String data;\n\n        ParsedLobWriteSql(int _offset, int _length, String _data) {","sourceCodeStart":1107,"sourceCodeEnd":1143,"githubUrl":"https://github.com/apache/seatunnel/blob/cf67b549a7a6c35fa0beb12d83c62892427ea919/seatunnel-connectors-v2/connector-cdc/connector-cdc-oracle/src/main/java/io/debezium/connector/oracle/logminer/processor/AbstractLogMinerEventProcessor.java#L1107-L1143","documentation":"LOB_WRITE redo statements must match a known textual pattern (LOB_WRITE_SQL_PATTERN) from which the connector extracts the written data. When the SQL doesn't match — LogMiner emitted a LOB_WRITE form the regex doesn't recognize — parseLobWrite (in the LOB parsing path of AbstractLogMinerEventProcessor) throws this DebeziumException rather than silently corrupting the event.","triggerScenarios":"Parsing a LOB_WRITE operation's SQL string (row.getSql()) when it is non-null but does not match LOB_WRITE_SQL_PATTERN.matches() — e.g. a differently formatted BEGIN_DATA/END_DATA payload from another Oracle version or a truncated/concatenated LOB fragment.","commonSituations":"Oracle version producing a LOB_WRITE syntax variant the embedded Debezium/SeaTunnel version doesn't know; extremely large LOB writes split in unexpected ways; interactive LOB (piecewise) operations with unusual chunk formats; connector version lagging behind the Oracle server version.","solutions":["Upgrade the Debezium connector version bundled with SeaTunnel — LOB_WRITE pattern handling is expanded across releases.","Avoid piecewise/dynamic LOB writes if possible; write LOB values in single statements that produce standard LOB_WRITE SQL.","Enable incremental snapshot /LOB-aware settings compatible with your Oracle version, or upgrade the Oracle JDBC driver to match.","Capture the failing SQL and report it (Debezium Jira) so the pattern can be extended."],"exampleFix":"null","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"try {\n    parsed = parseLobWrite(sql);\n} catch (DebeziumException e) {\n    if (e.getMessage().startsWith(\"Unable to parse unsupported LOB_WRITE SQL\")) {\n        LOGGER.warn(\"Unrecognized LOB_WRITE format, skipping: {}\", sql);\n    } else { throw e; }\n}","preventionTips":["Keep the Debezium version current — LOB_WRITE patterns grow over releases","Prefer single-statement LOB writes over piecewise/chunked LOB operations","Match the Oracle JDBC driver and server versions the connector supports","Report unrecognized LOB_WRITE SQL upstream to get the pattern extended"],"tags":["oracle","cdc","logminer","lob","redo-sql"],"backgroundTag":"invalid-argument-format","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"}