{"record":{"id":"ec7ee76354a9952a","repo":"apache/seatunnel","slug":"read-the-redolog-offset-error","errorCode":null,"errorMessage":"Read the redoLog offset error","messagePattern":"Read the redoLog offset error","errorType":"exception","errorClass":"RuntimeException","httpStatus":null,"severity":"error","filePath":"seatunnel-connectors-v2/connector-cdc/connector-cdc-oracle/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/oracle/source/offset/RedoLogOffsetFactory.java","lineNumber":60,"sourceCode":"        this.dialect = dialect;\n    }\n\n    @Override\n    public Offset earliest() {\n        return RedoLogOffset.INITIAL_OFFSET;\n    }\n\n    @Override\n    public Offset neverStop() {\n        return RedoLogOffset.NO_STOPPING_OFFSET;\n    }\n\n    @Override\n    public Offset latest() {\n        try (JdbcConnection jdbcConnection = dialect.openJdbcConnection(sourceConfig)) {\n            return OracleConnectionUtils.currentRedoLogOffset(jdbcConnection);\n        } catch (Exception e) {\n            throw new RuntimeException(\"Read the redoLog offset error\", e);\n        }\n    }\n\n    @Override\n    public Offset specific(Map<String, String> offset) {\n        return new RedoLogOffset(offset);\n    }\n\n    @Override\n    public Offset specific(String filename, Long position) {\n        throw new UnsupportedOperationException(\n                \"not supported create new Offset by filename and position.\");\n    }\n\n    @Override\n    public Offset timestamp(long timestamp) {\n        try (JdbcConnection jdbcConnection = dialect.openJdbcConnection(sourceConfig)) {\n            return OracleConnectionUtils.timestampToScn(","sourceCodeStart":42,"sourceCodeEnd":78,"githubUrl":"https://github.com/apache/seatunnel/blob/cf67b549a7a6c35fa0beb12d83c62892427ea919/seatunnel-connectors-v2/connector-cdc/connector-cdc-oracle/src/main/java/org/apache/seatunnel/connectors/seatunnel/cdc/oracle/source/offset/RedoLogOffsetFactory.java#L42-L78","documentation":"RedoLogOffsetFactory.latest() opens a JDBC connection to the Oracle database and reads the current SCN (redo log offset) via OracleConnectionUtils.currentRedoLogOffset. Any exception during connection setup or the SCN query is rethrown as a plain RuntimeException wrapping the original cause. It signals that the connector could not determine the starting position for redo log (CDC) reading.","triggerScenarios":"Calling RedoLogOffsetFactory.latest() when the Oracle host/port is unreachable, credentials are wrong, the user lacks privileges on V$DATABASE, or the underlying SELECT CURRENT_SCN query throws a SQLException.","commonSituations":"Misconfigured hostname/port in source config; wrong username/password; Oracle user missing log-mining privileges (LOGMINING, SELECT ANY TRANSACTION); database in a restricted/unmounted state; network/firewall blocking the listener.","solutions":["Verify connection parameters (hostname, port, service name, username, password) in the Oracle CDC source config","Test connectivity with a plain SQL client using the same credentials: SELECT CURRENT_SCN FROM V$DATABASE","Grant the log-mining privileges required by Debezium/LogMiner to the CDC user","Check the wrapped cause (e.getCause()) in the stack trace for the root JDBC error"],"exampleFix":"// before\nOffset offset = offsetFactory.latest(); // opaque RuntimeException\n// after\ntry {\n    Offset offset = offsetFactory.latest();\n} catch (RuntimeException e) {\n    LOG.error(\"Failed to read redo log offset; cause: \" + e.getCause(), e);\n    throw e;\n}","handlingStrategy":"try-catch","validationCode":"// Verify connectivity before starting CDC\ntry (Connection c = DriverManager.getConnection(jdbcUrl, user, pass);\n     Statement s = c.createStatement();\n     ResultSet rs = s.executeQuery(\"SELECT CURRENT_SCN FROM V$DATABASE\")) {\n    if (!rs.next()) throw new IllegalStateException(\"No SCN returned\");\n}","typeGuard":null,"tryCatchPattern":"try {\n    Offset offset = factory.latest();\n} catch (RuntimeException e) {\n    // inspect e.getCause() for the JDBC/ORA root error\n    LOG.error(\"redo log offset read failed: {}\", e.getCause() != null ? e.getCause().getMessage() : e.getMessage());\n    throw e;\n}","preventionTips":["Validate JDBC credentials and URL with a SQL client before submitting the job","Grant all required LogMiner/V$ privileges to the CDC user up front","Ensure network/firewall allows the Oracle listener port","Include database host/port/user context in your logging for diagnosis"],"tags":["oracle-cdc","jdbc","scn","offset"],"backgroundTag":"sql-query-failed","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"}