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https://issues.apache.org/jira/browse/BEAM-3970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16419739#comment-16419739
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Ben Sidhom commented on BEAM-3970:
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It looks like
[WindowMappingFnRunner|https://github.com/apache/beam/blob/master/sdks/java/harness/src/main/java/org/apache/beam/fn/harness/WindowMappingFnRunner.java]
should already support this. If so, we need to investigate why this is not
being picked up by ExecutableStages.
> Java SDK harness supports window_into
> -------------------------------------
>
> Key: BEAM-3970
> URL: https://issues.apache.org/jira/browse/BEAM-3970
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-harness
> Reporter: Ben Sidhom
> Assignee: Luke Cwik
> Priority: Major
>
> The Java SDK harness does not currently register a PTransformRunnerFactory
> for beam:transform:window_into:v1. We need this functionality for GroupByKey
> transforms.
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