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https://issues.apache.org/jira/browse/FLINK-5279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17466060#comment-17466060
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Yun Tang commented on FLINK-5279:
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Current error message has been "{{{}Keyed state can only be used on a 'keyed
stream', i.e., after a 'keyBy()' operation.{}}}", and I think we could still
improve this message via adding the state descriptor name.
> Improve error message when trying to access keyed state in non-keyed operator
> -----------------------------------------------------------------------------
>
> Key: FLINK-5279
> URL: https://issues.apache.org/jira/browse/FLINK-5279
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / State Backends
> Affects Versions: 1.1.3
> Reporter: Ufuk Celebi
> Priority: Minor
> Labels: auto-deprioritized-major, stale-minor
>
> When trying to access keyed state in a non-keyed operator, the error message
> is not very helpful. You get a trace like this:
> {code}
> java.lang.RuntimeException: Error while getting state
> ...
> Caused by: java.lang.RuntimeException: State key serializer has not been
> configured in the config. This operation cannot use partitioned state.
> {code}
> It will be helpful to users if this is more explicit to users, stating that
> the API can only be used on keyed streams, etc.
> If this applies to the current master as well, we should fix it there, too.
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