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https://issues.apache.org/jira/browse/BEAM-2486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16058646#comment-16058646
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Kenneth Knowles edited comment on BEAM-2486 at 6/22/17 2:56 AM:
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Hmm, I thought this was done in {{DoFnSignatures}}. It is definitely a 
runner-independent error. I will check it out.


was (Author: kenn):
Hmm, I thought this was done in {{DoFnSignatures}}. It is definitely a 
runner-independent error.

> 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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