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https://issues.apache.org/jira/browse/FLINK-8836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16383515#comment-16383515
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Tzu-Li (Gordon) Tai commented on FLINK-8836:
--------------------------------------------

[~StephanEwen]

All built-in Kryo default serializers, AFAIK, are stateless. However, users can 
also register their own serializer implementations via the `ExecutionConfig`, 
making them potentially stateful. The \{{KryoSerializer}} recognizes these user 
registrations and adds them to the Kryo object.

> Duplicating a KryoSerializer does not duplicate registered default serializers
> ------------------------------------------------------------------------------
>
>                 Key: FLINK-8836
>                 URL: https://issues.apache.org/jira/browse/FLINK-8836
>             Project: Flink
>          Issue Type: Bug
>          Components: Type Serialization System
>            Reporter: Tzu-Li (Gordon) Tai
>            Priority: Critical
>
> The {{duplicate()}} method of the {{KryoSerializer}} is as following:
> {code:java}
> public KryoSerializer<T> duplicate() {
>     return new KryoSerializer<>(this);
> }
> protected KryoSerializer(KryoSerializer<T> toCopy) {
>     defaultSerializers = toCopy.defaultSerializers;
>     defaultSerializerClasses = toCopy.defaultSerializerClasses;
>     kryoRegistrations = toCopy.kryoRegistrations;
>     ...
> }
> {code}
> Shortly put, when duplicating a {{KryoSerializer}}, the 
> {{defaultSerializers}} serializer instances are directly provided to the new 
> {{KryoSerializer}} instance.
>  This causes the fact that those default serializers are shared across two 
> different {{KryoSerializer}} instances, and therefore not a correct duplicate.



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