{"record":{"id":"bedda4e28b85f304","repo":"apache/hadoop","slug":"could-not-resolve-kerberos-principal-name","errorCode":null,"errorMessage":"Could not resolve Kerberos principal name: ","messagePattern":"Could not resolve Kerberos principal name: ","errorType":"exception","errorClass":"RuntimeException","httpStatus":null,"severity":"error","filePath":"hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/AuthenticationFilterInitializer.java","lineNumber":86,"sourceCode":"    Map<String, String> filterConfig = new HashMap<String, String>();\n\n    //setting the cookie path to root '/' so it is used for all resources.\n    filterConfig.put(AuthenticationFilter.COOKIE_PATH, \"/\");\n    Map<String, String> propsWithPrefix = conf.getPropsWithPrefix(prefix);\n\n    for (Map.Entry<String, String> entry : propsWithPrefix.entrySet()) {\n      filterConfig.put(entry.getKey(), entry.getValue());\n    }\n\n    //Resolve _HOST into bind address\n    String bindAddress = conf.get(HttpServer2.BIND_ADDRESS);\n    String principal = filterConfig.get(KerberosAuthenticationHandler.PRINCIPAL);\n    if (principal != null) {\n      try {\n        principal = SecurityUtil.getServerPrincipal(principal, bindAddress);\n      }\n      catch (IOException ex) {\n        throw new RuntimeException(\"Could not resolve Kerberos principal name: \" + ex.toString(), ex);\n      }\n      filterConfig.put(KerberosAuthenticationHandler.PRINCIPAL, principal);\n    }\n    return filterConfig;\n  }\n\n}\n","sourceCodeStart":68,"sourceCodeEnd":94,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/AuthenticationFilterInitializer.java#L68-L94","documentation":"Error \"Could not resolve Kerberos principal name: \" thrown in apache/hadoop.","triggerScenarios":"Thrown at hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/AuthenticationFilterInitializer.java:86 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Set the Kerberos principal for the authentication filter (hadoop.http.authentication.kerberos.principal) to a valid, resolvable principal including the hostname.","Ensure DNS resolution works for the host so the _HOST placeholder can be replaced.","Verify the keytab exists and is readable at the configured path."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"2add9630210752f88ceb1bb74eb65e37bf41da8e","analyzedAt":"2026-08-22T19:55:07.957Z","schemaVersion":2},"datasetVersion":"2026-08-22T20:17:22.307Z"}