{"record":{"id":"797941f5fbbaaf0b","repo":"apache/hadoop","slug":"no-namenode-available-to-invoke-in-from","errorCode":null,"errorMessage":"No namenode available to invoke {} {} in {} from {}","messagePattern":"No namenode available to invoke (.+?) (.+?) in (.+?) from (.+?)","errorType":"exception","errorClass":"ConnectException","httpStatus":null,"severity":"error","filePath":"hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcClient.java","lineNumber":616,"sourceCode":"    for (Entry<FederationNamenodeContext, IOException> entry :\n        ioes.entrySet()) {\n      FederationNamenodeContext namenode = entry.getKey();\n      String nnKey = namenode.getNamenodeKey();\n      String addr = namenode.getRpcAddress();\n      IOException ioe = entry.getValue();\n      if (ioe instanceof StandbyException) {\n        LOG.error(\"{} at {} is in Standby: {}\",\n            nnKey, addr, ioe.getMessage());\n      } else if (isUnavailableException(ioe)) {\n        exConnect++;\n        LOG.error(\"{} at {} cannot be reached: {}\",\n            nnKey, addr, ioe.getMessage());\n      } else {\n        LOG.error(\"{} at {} error: \\\"{}\\\"\", nnKey, addr, ioe.getMessage());\n      }\n    }\n    if (exConnect == ioes.size()) {\n      throw new ConnectException(msg);\n    } else {\n      throw new StandbyException(msg);\n    }\n  }\n\n  /**\n   * The RPC request is successfully processed by the NameNode, the NameNode status\n   * in the router cache is updated according to the ExecutionStatus.\n   *\n   * @param method Remote method to invoke.\n   * @param status Current execution status.\n   * @param namenode The namenode that successfully processed this RPC request.\n   * @param nsId Nameservice ID.\n   * @param client Connection client.\n   * @throws IOException If the state store cannot be accessed.\n   */\n  protected void postProcessResult(Method method, ExecutionStatus status,\n      FederationNamenodeContext namenode, String nsId, ProxyAndInfo<?> client) throws IOException {","sourceCodeStart":598,"sourceCodeEnd":634,"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#L598-L634","documentation":"Error \"No namenode available to invoke {} {} in {} from {}\" thrown in apache/hadoop.","triggerScenarios":"No available namenode could serve the specific RPC call for the given location.","commonSituations":"Subcluster outage, expired namenode registrations, or router-side caching of a dead namenode list.","solutions":["Verify namenode registration and health for the nameservice via the Router admin CLI or /metrics.","Restart or repair the failing namenodes so heartbeats resume.","Check State Store connectivity; stale or missing membership records cause empty namenode lists."],"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"}