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https://issues.apache.org/jira/browse/FLINK-16555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17062853#comment-17062853
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Lu Niu commented on FLINK-16555:
--------------------------------
[~sewen] would add more checking in
[https://github.com/apache/flink/blob/master/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/KeyedStream.java#L216]
. block enum type and others with unstable hashcode.
> 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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