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https://issues.apache.org/jira/browse/FLINK-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14942601#comment-14942601
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ASF GitHub Bot commented on FLINK-2802:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/flink/pull/1216


> Watermark triggered operators cannot progress with cyclic flows
> ---------------------------------------------------------------
>
>                 Key: FLINK-2802
>                 URL: https://issues.apache.org/jira/browse/FLINK-2802
>             Project: Flink
>          Issue Type: Bug
>          Components: Streaming
>            Reporter: Gyula Fora
>            Assignee: Gyula Fora
>            Priority: Blocker
>
> The problem is that we can easily create a cyclic watermark (time) dependency 
> in the stream graph which will result in a deadlock for watermark triggered 
> operators such as  the `WindowOperator`.
> A solution to this could be to emit a Long.MAX_VALUE watermark from the 
> iteration sources.



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