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https://issues.apache.org/jira/browse/FLINK-7731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16198396#comment-16198396
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Aljoscha Krettek commented on FLINK-7731:
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[~gerardg] Do you think we can close this issue or should we discuss how (if)
we can adapt Flink. I'm mostly against changing these parts because changes
here can have quite big implications for users.
> Trigger on GlobalWindow does not clean state completely
> -------------------------------------------------------
>
> Key: FLINK-7731
> URL: https://issues.apache.org/jira/browse/FLINK-7731
> Project: Flink
> Issue Type: Bug
> Components: Core, DataStream API
> Affects Versions: 1.3.2
> Reporter: Gerard Garcia
> Priority: Minor
>
> I have an operator that consists of:
> CoGroup Datastream -> GlobalWindow -> CustomTrigger -> Apply function
> The custom trigger fires and purges the elements after it has received the
> expected number of elements (or when a timeout fires) from one of the streams
> and the apply function merges the elements with the ones received from the
> other stream. It appears that the state of the operator grows continuously so
> it seems it never gets completely cleaned.
> There is a discussion in
> http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Clean-GlobalWidnow-state-td15613.html
> that suggests that it may be a bug.
> This job reproduces the issue:
> https://github.com/GerardGarcia/flink-global-window-growing-state
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