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https://issues.apache.org/jira/browse/FLINK-18998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17180380#comment-17180380
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Nico Kruber commented on FLINK-18998:
-------------------------------------
Maybe also add a line how to enable EventTime or point to the docs (not sure
how to maintain the link though)
> No watermark is shown on Flink UI when ProcessingTime is used
> -------------------------------------------------------------
>
> Key: FLINK-18998
> URL: https://issues.apache.org/jira/browse/FLINK-18998
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Web Frontend
> Affects Versions: 1.12.0, 1.11.1
> Reporter: Jun Qin
> Priority: Major
> Labels: starter, usability
> Fix For: 1.12.0
>
> Attachments: screenshot_2020-08-18_at_10.57.39.png
>
>
> As stated in the subject, no watermark is shown on Flink UI when
> ProcessingTime is used, see the attached screenshot. It is better to be more
> specific, like "Watermarks are only available if EventTime is used."
>
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