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https://issues.apache.org/jira/browse/SPARK-4898?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Rosen resolved SPARK-4898.
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Resolution: Won't Fix
I'm going to close this as "Won't Fix" for now, since Dill didn't turn out to
be a blocker for Python 3 and there doesn't seem to be a compelling reason to
switch to it, especially since doing so may carry a high risk of introducing
regressions.
> Replace cloudpickle with Dill
> -----------------------------
>
> Key: SPARK-4898
> URL: https://issues.apache.org/jira/browse/SPARK-4898
> Project: Spark
> Issue Type: Improvement
> Components: PySpark
> Reporter: Josh Rosen
>
> We should consider replacing our modified version of {{cloudpickle}} with
> [Dill|https://github.com/uqfoundation/dill], since it supports both Python 2
> and 3 and might do a better job of handling certain corner-cases.
> I attempted to do this a few months ago but ran into cases where Dill had
> issues pickling objects defined in doctests, which broke our test suite:
> https://github.com/uqfoundation/dill/issues/50. This issue may have been
> resolved now; I haven't checked.
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