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https://issues.apache.org/jira/browse/BEAM-4786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17547295#comment-17547295
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Kenneth Knowles commented on BEAM-4786:
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This issue has been migrated to https://github.com/apache/beam/issues/19063
> Distinct has bad parallelism characteristics
> --------------------------------------------
>
> Key: BEAM-4786
> URL: https://issues.apache.org/jira/browse/BEAM-4786
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Pablo Estrada
> Priority: P3
> Labels: Clarified, ccoss2019
>
> Distinct groups first and then drops extra elements. Should drop elements in
> the mappers, and later in reducers.
> https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/Distinct.java#L100
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