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https://issues.apache.org/jira/browse/BEAM-638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15995167#comment-15995167
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Eugene Kirpichov commented on BEAM-638:
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TextIO and AvroIO can now write unbounded data, producing one or more files per
window.
See
https://github.com/apache/beam/blob/master/examples/java/src/main/java/org/apache/beam/examples/WindowedWordCount.java#L210
and
https://github.com/apache/beam/blob/master/examples/java/src/main/java/org/apache/beam/examples/common/WriteOneFilePerWindow.java
> Add sink transform to write bounded data per window, pane, [and key] even
> when PCollection is unbounded
> -------------------------------------------------------------------------------------------------------
>
> Key: BEAM-638
> URL: https://issues.apache.org/jira/browse/BEAM-638
> Project: Beam
> Issue Type: New Feature
> Components: sdk-java-core
> Reporter: Jean-Baptiste Onofré
> Assignee: Davor Bonaci
>
> Today, if the pipeline source is unbounded, and the sink expects a bounded
> collection, there's no way to use a single pipeline. Even a window creates a
> chunk on the unbounded PCollection, but the "sub" PCollection is still
> unbounded.
> It would be helpful for users to have a Window function that create a bounded
> PCollection (on the window) from an unbounded PCollection coming from the
> source.
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