[SPARK-12511][PySpark][Streaming]Make sure PythonDStream.registerSerializer is called only once#10514

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zsxwing wants to merge 3 commits intoapache:masterfrom zsxwing:SPARK-12511

+38-10

Commits on Dec 29, 2015

Make sure TransformFunctionSerializer is created only once
zsxwing
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Commits on Dec 30, 2015