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https://issues.apache.org/jira/browse/FLINK-3439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15152164#comment-15152164
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Aljoscha Krettek commented on FLINK-3439:
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Yes, that's what I had in mind.
The second part is only necessary because we cannot shutdown sources because
that would break watermarks/checkpoints. If we could correctly close them and
that information would be taken into account by the checkpoint barrier logic
and the watermark logic we wouldn't need it.
> Remove final Long.MAX_VALUE Watermark in StreamSource
> -----------------------------------------------------
>
> Key: FLINK-3439
> URL: https://issues.apache.org/jira/browse/FLINK-3439
> Project: Flink
> Issue Type: Bug
> Components: Streaming
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
>
> I think this was an oversight. At one point we decided to not emit in-flight
> windows when closing the topology or sources.
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