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https://issues.apache.org/jira/browse/SPARK-4187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-4187.
------------------------------
       Resolution: Fixed
    Fix Version/s: 1.3.0

Looks like this was merged:
https://github.com/apache/spark/commit/d4fa04e50d299e9cad349b3781772956453a696b

but not for 1.2 as the PR suggests:
https://github.com/apache/spark/pull/3146

I assume this is really 1.3?

> External shuffle service should not use Java serializer
> -------------------------------------------------------
>
>                 Key: SPARK-4187
>                 URL: https://issues.apache.org/jira/browse/SPARK-4187
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 1.2.0
>            Reporter: Aaron Davidson
>             Fix For: 1.3.0
>
>
> The Java serializer does not make a good solution for talking between JVMs, 
> as the format may change between versions of the code, even if the class 
> itself does not change in an incompatible manner.



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