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https://issues.apache.org/jira/browse/FLINK-16193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17041274#comment-17041274
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Seth Wiesman commented on FLINK-16193:
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Also, if you think this makes sense could you please assign me the ticket.
> Improve error messaging when a key is assigned to the wrong key group range
> ---------------------------------------------------------------------------
>
> Key: FLINK-16193
> URL: https://issues.apache.org/jira/browse/FLINK-16193
> Project: Flink
> Issue Type: Improvement
> Components: API / DataStream
> Affects Versions: 1.11.0
> Reporter: Seth Wiesman
> Priority: Major
>
> Occasionally, users may run into an exception that reads something like:
>
> java.lang.IllegalArgumentException: Key group 45 is not in
> KeyGroupRange{startKeyGroup=0, endKeyGroup=42}
>
> This may be caused by a number of issues including:
> 1) Unstable hash and equals methods on their key objects
> 2) Improper use of DataStreamUtils#reinterpretAsKeyedStream
>
> Key group ranges are a fairly low level detail that most users will be
> unfamiliar with when working with Flink. We should offer more comprehensive
> error messaging that outlines likely causes and solutions.
>
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