{"record":{"id":"c8ccab5933bca8f0","repo":"apache/seatunnel","slug":"unexpected-error-while-connecting-to-mysql-and-loo-c8ccab","errorCode":null,"errorMessage":"Unexpected error while connecting to MySQL and looking at privileges for current user: ","messagePattern":"Unexpected error while connecting to MySQL and looking at privileges for current user: ","errorType":"exception","errorClass":"ConnectException","httpStatus":null,"severity":"error","filePath":"seatunnel-connectors-v2/connector-cdc/connector-cdc-mysql/src/main/java/io/debezium/connector/mysql/legacy/MySqlJdbcContext.java","lineNumber":381,"sourceCode":"        try {\n            jdbc.query(\n                    \"SHOW GRANTS FOR CURRENT_USER\",\n                    rs -> {\n                        while (rs.next()) {\n                            String grants = rs.getString(1);\n                            logger.debug(grants);\n                            if (grants == null) {\n                                return;\n                            }\n                            grants = grants.toUpperCase();\n                            if (grants.contains(\"ALL\")\n                                    || grants.contains(grantName.toUpperCase())) {\n                                result.set(true);\n                            }\n                        }\n                    });\n        } catch (SQLException e) {\n            throw new ConnectException(\n                    \"Unexpected error while connecting to MySQL and looking at privileges for current user: \",\n                    e);\n        }\n        return result.get();\n    }\n\n    public String connectionString() {\n        return jdbc.connectionString(MYSQL_CONNECTION_URL);\n    }\n\n    /**\n     * Read the MySQL charset-related system variables.\n     *\n     * @return the system variables that are related to server character sets; never null\n     */\n    protected Map<String, String> readMySqlCharsetSystemVariables() {\n        // Read the system variables from the MySQL instance and get the current database name ...\n        logger.debug(\"Reading MySQL charset-related system variables before parsing DDL history.\");","sourceCodeStart":363,"sourceCodeEnd":399,"githubUrl":"https://github.com/apache/seatunnel/blob/cf67b549a7a6c35fa0beb12d83c62892427ea919/seatunnel-connectors-v2/connector-cdc/connector-cdc-mysql/src/main/java/io/debezium/connector/mysql/legacy/MySqlJdbcContext.java#L363-L399","documentation":"MySqlJdbcContext.userHasPrivileges() executes `SHOW GRANTS FOR CURRENT_USER` and scans the grant strings for required privileges. An SQLException during this check is wrapped in a ConnectException with this message, failing the connector's permission validation step before replication starts.","triggerScenarios":"Calling userHasPrivileges(...) when the JDBC connection is unusable, SHOW GRANTS is rejected for the current user, or the result set iteration throws; caught at MySqlJdbcContext.java:381 and rethrown as ConnectException.","commonSituations":"Grant tables corrupted or restricted (privilege errors even for SHOW GRANTS); connecting via a proxy that strips the session context; server hardening that limits SHOW GRANTS; expired credentials/kerberos ticket causing the query to fail; auth plugin incompatibility (e.g. caching_sha2_password vs older driver).","solutions":["Examine the wrapped SQLException for the exact server error (access denied vs connection loss).","Run `SHOW GRANTS FOR CURRENT_USER();` with the same credentials via mysql CLI to reproduce and confirm.","Grant the connector user the required CDC privileges (SELECT, RELOAD, SHOW VIEW, REPLICATION SLAVE, REPLICATION CLIENT).","Fix authentication: align the driver with the server's default auth plugin, or rotate expired credentials.","Reconnect/restart the task if the cause was a transient connection drop."],"exampleFix":"// before\nthrow new ConnectException(\"Unexpected error while connecting to MySQL and looking at privileges for current user: \", e);\n// after\nthrow new ConnectException(\"Unable to verify privileges for user '\" + connection.username() + \"': \" + e.getMessage(), e);","handlingStrategy":"validation","validationCode":"// Verify the CDC user's grants before starting the connector:\ntry (Connection c = DriverManager.getConnection(jdbcUrl, user, pass);\n     Statement s = c.createStatement();\n     ResultSet rs = s.executeQuery(\"SHOW GRANTS FOR CURRENT_USER()\")) {\n    StringBuilder grants = new StringBuilder();\n    while (rs.next()) grants.append(rs.getString(1)).append('\\n');\n    String g = grants.toString().toUpperCase();\n    for (String needed : new String[]{\"REPLICATION SLAVE\", \"REPLICATION CLIENT\", \"SELECT\"}) {\n        if (!g.contains(needed)) throw new IllegalStateException(\"Missing privilege: \" + needed);\n    }\n}","typeGuard":"static boolean isAccessDenied(ConnectException ce) {\n    Throwable t = ce.getCause();\n    return t instanceof java.sql.SQLException\n        && ((java.sql.SQLException) t).getErrorCode() == 1044;\n}","tryCatchPattern":"try {\n    connector.start();\n} catch (org.apache.kafka.connect.errors.ConnectException e) {\n    if (e.getMessage().contains(\"looking at privileges for current user\")) {\n        // Usually fatal: wrong user/grants. Log cause and abort with guidance.\n        throw new IllegalArgumentException(\"Check CDC user grants: \" + e.getCause(), e);\n    } else { throw e; }\n}","preventionTips":["Provision the CDC user with REPLICATION SLAVE, REPLICATION CLIENT, SELECT, RELOAD, SHOW VIEW up front.","Run SHOW GRANTS FOR CURRENT_USER() as a deployment pre-check with the same credentials.","Rotate credentials before expiry and update connector config in sync.","Match the JDBC driver's auth plugin support to the MySQL server default (e.g. caching_sha2_password).","Re-run privilege validation after any DBA grant-table changes."],"tags":["mysql","jdbc","privileges","cdc","sql"],"backgroundTag":"sql-query-failed","analyzedSha":"cf67b549a7a6c35fa0beb12d83c62892427ea919","analyzedAt":"2026-09-10T21:44:55.265Z","contentChangedAt":"2026-09-10T21:44:55.265Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}