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https://issues.apache.org/jira/browse/FLINK-3554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15173563#comment-15173563
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Stephan Ewen commented on FLINK-3554:
-------------------------------------

A good point to emit the {{Long.MAX_VALUE}} watermark is in the source 
operator, after the {{run()}} function has properly exited (that only ever 
happens on bounded sources).

In addition, the operator must not be *stopped* or *canceled*.

> Bounded sources should emit a Max Watermark when they are done
> --------------------------------------------------------------
>
>                 Key: FLINK-3554
>                 URL: https://issues.apache.org/jira/browse/FLINK-3554
>             Project: Flink
>          Issue Type: Bug
>          Components: Streaming
>    Affects Versions: 1.0.0
>            Reporter: Stephan Ewen
>             Fix For: 1.0.1
>
>
> For proper event time support in bounded sources, these sources should emit a 
> final watermark before shutting down.



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