Github user MLnick commented on the pull request:
https://github.com/apache/spark/pull/455#issuecomment-45411654
@pwendell @mateiz ok I addressed those comments, and simplified things
quite a bit. I removed the registry and just used ```.get()``` (etc) directly
for the standard ```Writable``` types.
Also created factory method for instantiating a ```Converter``` and did
that early on in ```PythonRDD``` methods.
Finally, used ```RDD.first()``` to check for Pickle-ability of the keys and
values.
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