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https://issues.apache.org/jira/browse/FLINK-2891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14968621#comment-14968621
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Aljoscha Krettek commented on FLINK-2891:
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I think right now it is state/key for the window function because they just use
the same state interface that all user functions use and they are not aware of
windows. I think this is good, since you can keep state across windows in the
window evaluation function.
For triggers the state is per key/window.
> Key for Keyed State is not set upon Window Evaluation
> -----------------------------------------------------
>
> Key: FLINK-2891
> URL: https://issues.apache.org/jira/browse/FLINK-2891
> Project: Flink
> Issue Type: Sub-task
> Components: Streaming
> Affects Versions: 0.10
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
> Priority: Blocker
> Fix For: 0.10
>
>
> In both the aligned and the general-purpose windows the key for the keyed
> operator state is not set when evaluating the windows. This silently leads to
> incorrect results.
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