{"record":{"id":"150a29aa8e0b8b8c","repo":"apache/hadoop","slug":"eio","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_chmod.c","lineNumber":38,"sourceCode":"#include \"fuse_impls.h\"\n#include \"fuse_users.h\"\n#include \"fuse_connect.h\"\n\nint dfs_chmod(const char *path, mode_t mode)\n{\n  struct hdfsConn *conn = NULL;\n  hdfsFS fs;\n  TRACE1(\"chmod\", path)\n  int ret = 0;\n  dfs_context *dfs = (dfs_context*)fuse_get_context()->private_data;\n\n  assert(path);\n  assert(dfs);\n  assert('/' == *path);\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  if (hdfsChmod(fs, path, (short)mode)) {\n    ERROR(\"Could not chmod %s to %d\", path, (int)mode);\n    ret = (errno > 0) ? -errno : -EIO;\n    goto cleanup;\n  }\n\ncleanup:\n  if (conn) {\n    hdfsConnRelease(conn);\n  }\n\n  return ret;","sourceCodeStart":20,"sourceCodeEnd":56,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/fuse-dfs/fuse_impls_chmod.c#L20-L56","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_chmod.c:38 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 chmod 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"}