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https://issues.apache.org/jira/browse/BEAM-2569?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Groh updated BEAM-2569:
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Component/s: website
> 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, website
> Reporter: Thomas Groh
>
> 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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