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https://issues.apache.org/jira/browse/BEAM-2100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17546469#comment-17546469
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Kenneth Knowles commented on BEAM-2100:
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This issue has been migrated to https://github.com/apache/beam/issues/18337
> Improve error message for shifting elements back in time
> --------------------------------------------------------
>
> Key: BEAM-2100
> URL: https://issues.apache.org/jira/browse/BEAM-2100
> Project: Beam
> Issue Type: Improvement
> Components: sdk-java-core
> Reporter: Thomas Groh
> Priority: P3
> Labels: Clarified
>
> When an element is shifted forwards in time (often to the end of the Global
> Window) as a result of a GroupByKey, they can't be reassigned the timestamps
> the user expects. This is fine, but users don't understand why the elements
> have been shifted forwards, and we should improve the messaging around this
> error.
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