{"record":{"id":"7db7eb06bb2e8105","repo":"apache/hadoop","slug":"no-namenodes-to-invoke-with-params-from","errorCode":null,"errorMessage":"No namenodes to invoke {} with params {} from {}","messagePattern":"No namenodes to invoke (.+?) with params (.+?) from (.+?)","errorType":"exception","errorClass":"IOException","httpStatus":null,"severity":"error","filePath":"hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcClient.java","lineNumber":531,"sourceCode":"   * @param useObserver Whether to use observer namenodes.\n   * @param protocol the protocol of the connection.\n   * @param method Remote ClientProtocol method to invoke.\n   * @param params Variable list of parameters matching the method.\n   * @return The result of invoking the method.\n   * @throws ConnectException If it cannot connect to any Namenode.\n   * @throws StandbyException If all Namenodes are in Standby.\n   * @throws IOException If it cannot invoke the method.\n   */\n  @VisibleForTesting\n  public Object invokeMethod(\n      final UserGroupInformation ugi,\n      final List<? extends FederationNamenodeContext> namenodes,\n      boolean useObserver,\n      final Class<?> protocol, final Method method, final Object... params)\n          throws ConnectException, StandbyException, IOException {\n\n    if (namenodes == null || namenodes.isEmpty()) {\n      throw new IOException(\"No namenodes to invoke \" + method.getName() +\n          \" with params \" + Arrays.deepToString(params) + \" from \"\n          + router.getRouterId());\n    }\n\n    addClientInfoToCallerContext(ugi);\n\n    Object ret = null;\n    if (rpcMonitor != null) {\n      rpcMonitor.proxyOp();\n    }\n\n    ExecutionStatus status = new ExecutionStatus(false, useObserver);\n    Map<FederationNamenodeContext, IOException> ioes = new LinkedHashMap<>();\n    for (FederationNamenodeContext namenode : namenodes) {\n      if (!status.isShouldUseObserver()\n          && (namenode.getState() == FederationNamenodeServiceState.OBSERVER)) {\n        continue;\n      }","sourceCodeStart":513,"sourceCodeEnd":549,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcClient.java#L513-L549","documentation":"Error \"No namenodes to invoke {} with params {} from {}\" thrown in apache/hadoop.","triggerScenarios":"RouterRpcClient found no candidate namenodes to invoke the given method against.","commonSituations":"Mount table points at nameservices with no registered/active namenodes, or all resolved namenodes are unavailable.","solutions":["Ensure at least one active namenode is registered for the destination nameservices of the path.","Review the mount table entry for the path to confirm its destinations map to live nameservices.","Check Router logs for resolver/heartbeat failures that emptied the namenode list."],"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":"2026-08-23T01:17:44.959Z"}