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https://issues.apache.org/jira/browse/FLINK-2074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14556410#comment-14556410
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ASF GitHub Bot commented on FLINK-2074:
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Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/716#issuecomment-104706869
I don't know, all this time we had the wrong behaviour and no tests were
catching it.
> Sliding Window Keeps Emitting Elements After Source Stops Producing
> -------------------------------------------------------------------
>
> Key: FLINK-2074
> URL: https://issues.apache.org/jira/browse/FLINK-2074
> Project: Flink
> Issue Type: Bug
> Components: Streaming
> Affects Versions: 0.9
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
> Priority: Blocker
>
> This happens when the source produces some elements, then the source stops
> for a while and then produces again some elements before stopping again.
> After this, the window will just keep emitting the last emitted element
> indefinitely.
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