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https://issues.apache.org/jira/browse/FLINK-16555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17060278#comment-17060278
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Seth Wiesman commented on FLINK-16555:
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Related: https://issues.apache.org/jira/browse/FLINK-5874
> Preflight check for known unstable hashCodes.
> ---------------------------------------------
>
> Key: FLINK-16555
> URL: https://issues.apache.org/jira/browse/FLINK-16555
> Project: Flink
> Issue Type: Improvement
> Components: API / DataStream, API / Type Serialization System
> Reporter: Stephan Ewen
> Priority: Critical
> Labels: usability
> Fix For: 1.11.0
>
>
> Data types can only be used as keys, if they have a stable hash code
> implementation that is deterministic across JVMs. Otherwise, the keyBy()
> operations will result in incorrect data routing.
> We should eagerly check the key type information for known cases types with
> unstable hash code, such as
> * arrays
> * enums
> * anything that does not override Object.hashCode
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