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https://issues.apache.org/jira/browse/FLINK-5692?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jin Mingjian reassigned FLINK-5692:
-----------------------------------
Assignee: Jin Mingjian
> Add an Option to Deactivate Kryo Fallback for Serializers
> ---------------------------------------------------------
>
> Key: FLINK-5692
> URL: https://issues.apache.org/jira/browse/FLINK-5692
> Project: Flink
> Issue Type: New Feature
> Components: Type Serialization System
> Affects Versions: 1.2.0
> Reporter: Stephan Ewen
> Assignee: Jin Mingjian
> Labels: easyfix, starter
>
> Some users want to avoid that Flink's serializers use Kryo, as it can easily
> become a hotspot in serialization.
> For those users, it would help if there is a flag to "deactive generic
> types". Those users could then see where types are used that default to Kryo
> and change these types (make them PoJos, Value types, or write custom
> serializers).
> There are two ways to approach that:
> 1. (Simple) Make {{GenericTypeInfo}} threw an exception whenever it would
> create a Kryo Serializer (when the respective flag is set in the
> {{ExecutionConfig}})
> 2. Have a static flag on the {{TypeExtractor}} to throw an exception
> whenever it would create a {{GenericTypeInfo}}. This approach has the
> downside of introducing some static configuration to the TypeExtractor, but
> may be more helpful because it throws exceptions in the programs at points
> where the types are used (not where the serializers are created, which may be
> much later).
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