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https://issues.apache.org/jira/browse/FLINK-10839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16681347#comment-16681347
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Stefan Richter commented on FLINK-10839:
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https://github.com/apache/flink/pull/7061
> Fix implementation of PojoSerializer.duplicate() w.r.t. subclass serializer
> ---------------------------------------------------------------------------
>
> Key: FLINK-10839
> URL: https://issues.apache.org/jira/browse/FLINK-10839
> Project: Flink
> Issue Type: Bug
> Components: Type Serialization System
> Reporter: Stefan Richter
> Assignee: Stefan Richter
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 1.6.3, 1.7.0
>
>
> The implementation of {{PojoSerializer.duplicate()}} currently ignores that
> subclassSerializerCache is a shared resource. We must always return a new
> instance of the serializer, even if all the nested field serializers are not
> stateful or else concurrency problems might occur if we have cached subclass
> serializers.
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