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https://issues.apache.org/jira/browse/BEAM-8529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17548283#comment-17548283
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Danny McCormick commented on BEAM-8529:
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This issue has been migrated to https://github.com/apache/beam/issues/19925
> Samza runner does not allow using Void as key in grouping operations
> --------------------------------------------------------------------
>
> Key: BEAM-8529
> URL: https://issues.apache.org/jira/browse/BEAM-8529
> Project: Beam
> Issue Type: Bug
> Components: runner-samza
> Affects Versions: 2.17.0
> Reporter: Jan Lukavský
> Priority: P3
>
> Using {{Void}} as key type for grouping operations fails due to the fact that
> its only value is {{null}} and SamzaRunner does not accept using {{null}}
> values as keys. Other runners seem to work fine with that.
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