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https://issues.apache.org/jira/browse/BEAM-2486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16075682#comment-16075682
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Kenneth Knowles commented on BEAM-2486:
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This is in PR and very easy, should make the agreed upon July 10th
> Should throws some useful messages when statefulParDo use non-KV input
> ----------------------------------------------------------------------
>
> Key: BEAM-2486
> URL: https://issues.apache.org/jira/browse/BEAM-2486
> Project: Beam
> Issue Type: Improvement
> Components: runner-core, runner-flink
> Reporter: Jingsong Lee
> Assignee: Kenneth Knowles
> Fix For: 2.1.0
>
>
> Now Flink runner will throws a ClassCastException without detail messages
> when a statefulParDo use non-KV input. It is not easy for users to find
> errors and causes.
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