Obscure error messages from the HDFS extension

[simleo]

Some error messages from the HDFS extension are uninformative, e.g.:

>>> hdfs.rm("doesnotexist.txt")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.6/dist-packages/pydoop-2.0a4-py3.6-linux-x86_64.egg/pydoop/hdfs/__init__.py", line 277, in rm
    retval = fs.delete(path_, recursive=recursive)
  File "/usr/local/lib/python3.6/dist-packages/pydoop-2.0a4-py3.6-linux-x86_64.egg/pydoop/hdfs/fs.py", line 346, in delete
    return self.fs.delete(path, recursive)
OSError: [Errno 5] Input/output error

>>> hdfs.rm("foo", recursive=False)
hdfsDelete(path=/user/root/foo, recursive=0): FileSystem#delete error:
(unable to get stack trace for org.apache.hadoop.fs.PathIsNotEmptyDirectoryException exception: ExceptionUtils::getStackTrace error.)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.6/dist-packages/pydoop-2.0a4-py3.6-linux-x86_64.egg/pydoop/hdfs/__init__.py", line 277, in rm
    retval = fs.delete(path_, recursive=recursive)
  File "/usr/local/lib/python3.6/dist-packages/pydoop-2.0a4-py3.6-linux-x86_64.egg/pydoop/hdfs/fs.py", line 346, in delete
    return self.fs.delete(path, recursive)
OSError: [Errno 255] Unknown error 255

Is there anything we can do in the extension code (are we failing to reset errno or something) or is the problem in libhdfs? Needs investigation.

[saveResources-searchSpace]

it deletes the file but still throws this error