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https://issues.apache.org/jira/browse/FLINK-18631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17336134#comment-17336134
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Flink Jira Bot commented on FLINK-18631:
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This issue was labeled "stale-major" 7 ago and has not received any updates so
it is being deprioritized. If this ticket is actually Major, please raise the
priority and ask a committer to assign you the issue or revive the public
discussion.
> Serializer for scala sealed trait hierarchies
> ---------------------------------------------
>
> Key: FLINK-18631
> URL: https://issues.apache.org/jira/browse/FLINK-18631
> Project: Flink
> Issue Type: Improvement
> Components: API / Type Serialization System
> Affects Versions: 1.11.0
> Reporter: Roman Grebennikov
> Priority: Major
> Labels: performance, pull-request-available, stale-major
>
> Currently, when flink serialization system spots an ADT-style class hierarchy
> in the Scala code, it falls back to GenericType and kryo serialization, which
> may introduce performance issues. For example, for code:
> {{sealed trait ADT}}
> {{case class Foo(a: String) extends ADT}}
> {{case class Bar(b: Int) extends ADT}}
> {{env.fromCollection(List[ADT](Foo("a"),Bar(1))).collect()}}
>
> It will fall back to Kryo even if there is no problem with dealing with
> List[Foo] or List[Bar] separately. Using ADTs is a convenient way in Scala to
> model different types of messages, but Flink type system performance limits
> it to only a non performance-critical paths.
>
> It would be nice to have a sealed trait hierarchies support out of the box
> without kryo fallback.
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