EIO

EIO

Error message

fuseConnectAsThreadUid: failed to open a libhdfs connection!  error %d.

What it means

Error "fuseConnectAsThreadUid: failed to open a libhdfs connection! error %d. " thrown in apache/hadoop.

Source

Thrown at hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/fuse-dfs/fuse_impls_getattr.c:39

#include "fuse_stat_struct.h"
#include "fuse_connect.h"

int dfs_getattr(const char *path, struct stat *st)
{
  struct hdfsConn *conn = NULL;
  hdfsFS fs;
  int ret;
  hdfsFileInfo *info;

  TRACE1("getattr", path)
  dfs_context *dfs = (dfs_context*)fuse_get_context()->private_data;
  assert(dfs);
  assert(path);
  assert(st);

  ret = fuseConnectAsThreadUid(&conn);
  if (ret) {
    fprintf(stderr, "fuseConnectAsThreadUid: failed to open a libhdfs "
            "connection!  error %d.\n", ret);
    ret = -EIO;
    goto cleanup;
  }
  fs = hdfsConnGetFs(conn);
  
  info = hdfsGetPathInfo(fs,path);
  if (NULL == info) {
    ret = -ENOENT;
    goto cleanup;
  }
  fill_stat_structure(&info[0], st);

  // setup hard link info - for a file it is 1 else num entries in a dir + 2 (for . and ..)
  if (info[0].mKind == kObjectKindDirectory) {
    int numEntries = 0;
    hdfsFileInfo *info = hdfsListDirectory(fs,path,&numEntries);

View on GitHub (pinned to 2add963021)

Solutions

Verify the user's Kerberos ticket is valid (kinit) and that libhdfs can connect to the NameNode; then retry the getattr/stat operation.
Check the error code to distinguish authentication failure from configuration problems (CLASSPATH/HADOOP_CONF_DIR).

When it happens

Trigger: Thrown at hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/fuse-dfs/fuse_impls_getattr.c:39 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of apache/hadoop@2add963021 (2026-08-22). Data as JSON: /api/errors/c9aa3a90dc189f43. Report an issue: GitHub.