[jira] [Closed] (SPARK-10544) Serialization of Python namedtuple subclasses in functions / closures is broken

["Davies Liu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-10544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Davies Liu closed SPARK-10544.
------------------------------
          Resolution: Duplicate
       Fix Version/s:     (was: 1.5.1)
    Target Version/s: 1.5.1

> Serialization of Python namedtuple subclasses in functions / closures is broken
> -------------------------------------------------------------------------------
>
>                 Key: SPARK-10544
>                 URL: https://issues.apache.org/jira/browse/SPARK-10544
>             Project: Spark
>          Issue Type: Bug
>          Components: PySpark
>    Affects Versions: 1.5.0
>            Reporter: Josh Rosen
>            Priority: Blocker
>
> The following example works on Spark 1.4.1 but not in 1.5:
> {code}
> from collections import namedtuple
> Person = namedtuple("Person", "id firstName lastName")
> rdd = sc.parallelize([1]).map(lambda x: Person(1, "Jon", "Doe"))
> rdd.count()
> {code}
> In 1.5, this gives an "AttributeError: 'builtin_function_or_method' object has no attribute '__code__'" error.
> Digging a bit deeper, it seems that the problem is the serialization of the {{Person}} class itself, since serializing _instances_ of the class in the closure seems to work properly:
> {code}
> from collections import namedtuple
> Person = namedtuple("Person", "id firstName lastName")
> jon = Person(1, "Jon", "Doe")
> rdd = sc.parallelize([1]).map(lambda x: jon)
> rdd.count()
> {code}
> It looks like PySpark has unit tests for serializing individual namedtuples with cloudpickle.dumps and for serializing RDDs of namedtuples, but I don't think that we have any tests for namedtuple classes in closures.



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