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https://issues.apache.org/jira/browse/BEAM-2569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17131902#comment-17131902
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Beam JIRA Bot commented on BEAM-2569:
-------------------------------------
This issue is P2 but has been unassigned without any comment for 60 days so it
has been labeled "stale-P2". If this issue is still affecting you, we care!
Please comment and remove the label. Otherwise, in 14 days the issue will be
moved to P3.
Please see https://beam.apache.org/contribute/jira-priorities/ for a detailed
explanation of what these priorities mean.
> Be more precise in what is required to write a valid CombineFn
> --------------------------------------------------------------
>
> Key: BEAM-2569
> URL: https://issues.apache.org/jira/browse/BEAM-2569
> Project: Beam
> Issue Type: Bug
> Components: beam-model, sdk-java-core, sdk-py-core, website
> Reporter: Thomas Groh
> Priority: P2
> Labels: stale-P2
>
> We should be explicit in requiring merging of accumulators to be associative
> and commutative, and the ability to include empty accumulators.
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