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https://issues.apache.org/jira/browse/FLINK-3757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15339744#comment-15339744
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Maximilian Michels commented on FLINK-3757:
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It does throw an exception if you previously added it in the same Task. I
agree, we should clarify that.
> addAccumulator does not throw Exception on duplicate accumulator name
> ---------------------------------------------------------------------
>
> Key: FLINK-3757
> URL: https://issues.apache.org/jira/browse/FLINK-3757
> Project: Flink
> Issue Type: Bug
> Reporter: Konstantin Knauf
> Priority: Minor
>
> Works if tasks are chained, but in many situations it does not, see
> See https://gist.github.com/knaufk/a0026eff9792aa905a2f586f3b0cb112
> Is this an undocumented feature or a valid bug?
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