[
https://issues.apache.org/jira/browse/BEAM-4525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16506725#comment-16506725
]
Sam Whittle commented on BEAM-4525:
-----------------------------------
A work around in the meantime is to use FixedWindows or to manually combine
elements in the DoFn before GroupByKey instead of relying on combiner lifting.
> Allow combiner lifting with AfterProcessingTime trigger in Dataflow Runner
> --------------------------------------------------------------------------
>
> Key: BEAM-4525
> URL: https://issues.apache.org/jira/browse/BEAM-4525
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow
> Reporter: Sam Whittle
> Assignee: Sam Whittle
> Priority: Minor
>
> This seems safe with AfterProcessingTime since otherwise assigning to panes
> is based upon system timing. A valid output without combiner lifting would
> be for all the elements to arrive in a single batch with the same timestamp
> so allowing combiner lifting seems equivalent and more efficient.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
