Github user davies commented on the pull request:
https://github.com/apache/spark/pull/2492#issuecomment-56463455
> Maybe my JIRA was misleadingly named; my motivation here is allowing
users to specify versions of packages that take precedence over other versions
of that same package that might be installed on the system, not in overriding
modules included in Python's standard library (although the ability to do that
is a side-effect of this change).
Understood, this side-effect is bit dangerous. The third-package could
appear in sys.path in any order, such as
```python
>>> import sys
>>> sys.path
['', '//anaconda/lib/python2.7/site-packages/DPark-0.1-py2.7.egg',
'//anaconda/lib/python2.7/site-packages/protobuf-2.5.0-py2.7.egg',
'//anaconda/lib/python2.7/site-packages/msgpack_python-0.4.2-py2.7-macosx-10.5-x86_64.egg',
'//anaconda/lib/python2.7/site-packages/setuptools-3.6-py2.7.egg',
'/Users/daviesliu/work/spark/python/lib',
'/Users/daviesliu/work/spark/python/lib/py4j-0.8.2.1-src.zip',
'/Users/daviesliu/work/spark/python', '//anaconda/lib/python27.zip',
'//anaconda/lib/python2.7', '//anaconda/lib/python2.7/plat-darwin',
'//anaconda/lib/python2.7/plat-mac',
'//anaconda/lib/python2.7/plat-mac/lib-scriptpackages',
'//anaconda/lib/python2.7/lib-tk', '//anaconda/lib/python2.7/lib-old',
'//anaconda/lib/python2.7/lib-dynload',
'//anaconda/lib/python2.7/site-packages',
'//anaconda/lib/python2.7/site-packages/PIL',
'//anaconda/lib/python2.7/site-packages/runipy-0.1.0-py2.7.egg']
```
it's not easy to find a position which is before third-package but after
standard module.
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