Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/1623#issuecomment-51021399
Here's another (contrived) example that breaks:
```python
from collections import namedtuple as nt
from pyspark import SparkContext
from pyspark.serializers import PickleSerializer
sc = SparkContext("local")
p = PickleSerializer()
Person = nt("Person", 'id firstName lastName')
jon = Person(1, "Jon", "Doe")
sc.textFile("/usr/share/dict/words").map(lambda x: jon).first()
```
It looks like the problem here is that line 306 assumes that old references
will be named `namedtuple`, which isn't true if I import it under a different
name.
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