hdfsConnExpiry: LOGIC ERROR: condemned connection as %s is s

Error message

hdfsConnExpiry: LOGIC ERROR: condemned connection as %s is still in the tree!

What it means

Error "hdfsConnExpiry: LOGIC ERROR: condemned connection as %s is still in the tree! " thrown in apache/hadoop.

Source

Thrown at hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/fuse-dfs/fuse_connect.c:353

      if (hdfsConnCheckKpath(conn)) {
        conn->condemned = 1;
        RB_REMOVE(hdfsConnTree, &gConnTree, conn);
        if (conn->refcnt == 0) {
          /* If the connection is not in use by any threads, delete it
           * immediately.  If it is still in use by some threads, the last
           * thread using it will clean it up later inside hdfsConnRelease. */
          hdfsConnFree(conn);
          continue;
        }
      }
    }
    if (conn->refcnt == 0) {
      /* If the connection is not currently in use by a thread, check to see if
       * it ought to be removed because it's too old. */
      conn->expirationCount--;
      if (conn->expirationCount <= 0) {
        if (conn->condemned) {
          fprintf(stderr, "hdfsConnExpiry: LOGIC ERROR: condemned connection "
                  "as %s is still in the tree!\n", conn->usrname);
        }
        fprintf(stderr, "hdfsConnExpiry: freeing and removing connection as "
                "%s because it's now too old.\n", conn->usrname);
        RB_REMOVE(hdfsConnTree, &gConnTree, conn);
        hdfsConnFree(conn);
      }
    }
  }
  pthread_mutex_unlock(&gConnMutex);
}

// The Kerberos FILE: prefix.  This indicates that the kerberos ticket cache
// specifier is a file.  (Note that we also assume that the specifier is a file
// if no prefix is present.)
#define KRB_FILE_PREFIX "FILE:"

// Length of the Kerberos file prefix, which is equal to the string size in

View on GitHub (pinned to 2add963021)

Solutions

This indicates an internal fuse-dfs connection-table bug; restart the fuse-dfs mount to clear the corrupted connection state.

When it happens

Trigger: Thrown at hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/fuse-dfs/fuse_connect.c:353 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/689e9412cdeaaba0. Report an issue: GitHub.