holdenk commented on SPARK-3981:

That's a good question. It seems like much of the code that was copied in 
SPARK-3971 is still around, but given our slow migration from MLlib to ML I'm 
thinking that we should maybe consider marking this as a "Won't Fix". What are 
your thoughts [~mengxr]?

> Consider a better approach to initialize SerDe on executors
> -----------------------------------------------------------
>                 Key: SPARK-3981
>                 URL: https://issues.apache.org/jira/browse/SPARK-3981
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib, PySpark
>    Affects Versions: 1.2.0
>            Reporter: Xiangrui Meng
> In SPARK-3971, we copied SerDe code from Core to MLlib in order to recognize 
> MLlib types on executors as a hotfix. This is not ideal. We should find a way 
> to add hooks to the SerDe in Core to support MLlib types in a pluggable way.

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