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https://issues.apache.org/jira/browse/BEAM-4228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17146105#comment-17146105
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Maximilian Michels commented on BEAM-4228:
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I think this has been resolved by [~dmvk].
> The FlinkRunner shouldn't require all of the values for a key to fit in memory
> ------------------------------------------------------------------------------
>
> Key: BEAM-4228
> URL: https://issues.apache.org/jira/browse/BEAM-4228
> Project: Beam
> Issue Type: New Feature
> Components: runner-flink
> Reporter: Thomas Groh
> Priority: P3
>
> The use of a reducer that adds all of the elements that it consumes to a list
> is the primary way in which this occurs - if instead, we produce a filtered
> iterable, or a collection of filtered iterables, we can lazily iterate over
> all of the contained elements without having to buffer all of the elements.
>
> For an example of where this occurs, see {{Concatenate}} in
> {{FlinkBatchPortablePipelineTranslator}}.
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