[
https://issues.apache.org/jira/browse/BEAM-638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15507706#comment-15507706
]
Aljoscha Krettek commented on BEAM-638:
---------------------------------------
I don't think it's possible to provide such a function.
What would the semantics of such a function be? That is, when would it consider
that window "done", what happens to the computation upstream from that
function/transformation, would it be canceled? Also, which window would be the
one window that we take, for example from {{FixedWindows}}?
> Add a Window function to create a bounded PCollection from an unbounded one
> ---------------------------------------------------------------------------
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
