{"record":{"id":"cad2e023635d6e8d","repo":"apache/hadoop","slug":"eio-cad2e0","errorCode":"EIO","errorMessage":"fuseConnectAsThreadUid: failed to open a libhdfs connection!  error %d.\n","messagePattern":"fuseConnectAsThreadUid: failed to open a libhdfs connection!  error (.+?)\\.\n","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/fuse-dfs/fuse_impls_mkdir.c","lineNumber":44,"sourceCode":"  struct hdfsConn *conn = NULL;\n  hdfsFS fs;\n  dfs_context *dfs = (dfs_context*)fuse_get_context()->private_data;\n  int ret;\n\n  TRACE1(\"mkdir\", path)\n\n  assert(path);\n  assert(dfs);\n  assert('/' == *path);\n\n  if (is_protected(path)) {\n    ERROR(\"HDFS trying to create directory %s\", path);\n    return -EACCES;\n  }\n\n  ret = fuseConnectAsThreadUid(&conn);\n  if (ret) {\n    fprintf(stderr, \"fuseConnectAsThreadUid: failed to open a libhdfs \"\n            \"connection!  error %d.\\n\", ret);\n    ret = -EIO;\n    goto cleanup;\n  }\n  fs = hdfsConnGetFs(conn);\n\n  // In theory the create and chmod should be atomic.\n\n  if (hdfsCreateDirectory(fs, path)) {\n    ERROR(\"HDFS could not create directory %s\", path);\n    ret = (errno > 0) ? -errno : -EIO;\n    goto cleanup;\n  }\n\n  if (hdfsChmod(fs, path, (short)mode)) {\n    ERROR(\"Could not chmod %s to %d\", path, (int)mode);\n    ret = (errno > 0) ? -errno : -EIO;\n  }","sourceCodeStart":26,"sourceCodeEnd":62,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/fuse-dfs/fuse_impls_mkdir.c#L26-L62","documentation":"Error \"fuseConnectAsThreadUid: failed to open a libhdfs connection!  error %d.\n\" thrown in apache/hadoop.","triggerScenarios":"Thrown at hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/fuse-dfs/fuse_impls_mkdir.c:44 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Verify the user's Kerberos ticket is valid (kinit) and that libhdfs can connect to the NameNode; then retry the mkdir operation.","Check the error code to distinguish authentication failure from configuration problems (CLASSPATH/HADOOP_CONF_DIR)."],"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"}