{"record":{"id":"20626404053158fc","repo":"apache/hadoop","slug":"eio-206264","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_chown.c","lineNumber":66,"sourceCode":"    user = getUsername(uid);\n    if (NULL == user) {\n      ERROR(\"Could not lookup the user id string %d\",(int)uid);\n      ret = -EIO;\n      goto cleanup;\n    }\n  }\n  if (gid != -1) {\n    group = getGroup(gid);\n    if (group == NULL) {\n      ERROR(\"Could not lookup the group id string %d\",(int)gid);\n      ret = -EIO;\n      goto cleanup;\n    }\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\n  if (hdfsChown(hdfsConnGetFs(conn), path, user, group)) {\n    ret = errno;\n    ERROR(\"Could not chown %s to %d:%d: error %d\", path, (int)uid, gid, ret);\n    ret = (ret > 0) ? -ret : -EIO;\n    goto cleanup;\n  }\n\ncleanup:\n  if (conn) {\n    hdfsConnRelease(conn);\n  }\n  free(user);\n  free(group);","sourceCodeStart":48,"sourceCodeEnd":84,"githubUrl":"https://github.com/apache/hadoop/blob/2add9630210752f88ceb1bb74eb65e37bf41da8e/hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/fuse-dfs/fuse_impls_chown.c#L48-L84","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_chown.c:66 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 chown 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":"2026-08-23T01:17:44.959Z"}