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https://issues.apache.org/jira/browse/FLINK-16596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17336273#comment-17336273
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Flink Jira Bot commented on FLINK-16596:
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This issue was labeled "stale-major" 7 ago and has not received any updates so
it is being deprioritized. If this ticket is actually Major, please raise the
priority and ask a committer to assign you the issue or revive the public
discussion.
> Support Enum-Values as part of a Key
> ------------------------------------
>
> Key: FLINK-16596
> URL: https://issues.apache.org/jira/browse/FLINK-16596
> Project: Flink
> Issue Type: Improvement
> Components: API / DataStream
> Reporter: Felix Wollschläger
> Priority: Major
> Labels: stale-major
>
> See: FLINK-11774
> h2. Description:
> The hashCode implementation of Enum-Values is guaranteed to be stable inside
> a JVM, but not accross multiple JVMs. This leads to failures when restoring
> from a checkpoint/savepoint containing Keyed-State on Keys with Enums as a
> part of the key.
> For users of Flink there is a workaround to solve this problem:
> Don't rely on the hashCode-Implementation of Enum-Values in the
> hashCode-Implementation of the actual key. Use the ordinal() or
> name().hashCode() instead of the Enum hashCode.
> h2. Goals of this improvement:
> Implement a way to handle Enum-Values, by either handling Enum-Values on a
> internal level or implementing a abstract Base KeySelector class that users
> of flink can choose if their key contains a Enum-Value.
> Code to reproduce a failure and first thoughts can be found in FLINK-11774 .
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