{"record":{"id":"bac532a309075611","repo":"apache/hadoop","slug":"eio-bac532","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_open.c","lineNumber":111,"sourceCode":"  int64_t flagRet;\n\n  TRACE1(\"open\", path)\n\n  // check params and the context var\n  assert(path);\n  assert('/' == *path);\n  assert(dfs);\n\n  // retrieve dfs specific data\n  fh = (dfs_fh*)calloc(1, sizeof (dfs_fh));\n  if (!fh) {\n    ERROR(\"Malloc of new file handle failed\");\n    ret = -EIO;\n    goto error;\n  }\n  ret = fuseConnectAsThreadUid(&fh->conn);\n  if (ret) {\n    fprintf(stderr, \"fuseConnectAsThreadUid: failed to open a libhdfs \"\n            \"connection!  error %d.\\n\", ret);\n    ret = -EIO;\n    goto error;\n  }\n  fs = hdfsConnGetFs(fh->conn);\n  flagRet = get_hdfs_open_flags(fs, path, fi->flags);\n  if (flagRet < 0) {\n    ret = -flagRet;\n    goto error;\n  }\n  flags = flagRet;\n  if ((fh->hdfsFH = hdfsOpenFile(fs, path, flags,  0, 0, 0)) == NULL) {\n    ERROR(\"Could not open file %s (errno=%d)\", path, errno);\n    if (errno == 0 || errno == EINTERNAL) {\n      ret = -EIO;\n      goto error;\n    }\n    ret = -errno;","sourceCodeStart":93,"sourceCodeEnd":129,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/fuse-dfs/fuse_impls_open.c#L93-L129","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_open.c:111 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 open 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"}