Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/1623#issuecomment-50950663
I came up with a contrived example that doesn't work. Try running the
following with `./bin/pyspark`:
```python
from collections import namedtuple
Person = namedtuple("Person", 'id firstName lastName')
jon = Person(1, "Jon", "Doe")
from pyspark import SparkContext
sc = SparkContext("local")
sc.textFile("/usr/share/dict/words").map(lambda x: jon).first()
```
This results in a pickling error.
The problem here is that `_hack_namedtuple()` is registered too late. What
if you made it into a classmethod in PickleSerializer and called it from
SparkContext.__init__()?
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