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https://issues.apache.org/jira/browse/FLINK-3427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15467660#comment-15467660
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Ivan Mushketyk commented on FLINK-3427:
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Hey [~rmetzger], my idea was to record a timestamp of the latest watermark on
every vertex and display timestamps in the "Subtask" panel with other metrics
(here is a panel I am talking about:
https://cloud.githubusercontent.com/assets/592286/18147690/c287947e-6fcd-11e6-8968-ff47283635b7.png).
On the other hand, we could enhance the graph representation and display
watermarks and number of events for every vertex there. Maybe something similar
to Google Dataflow UI: https://youtu.be/TnLiEWglqHk?t=22m4s
> Add watermark monitoring to JobManager web frontend
> ---------------------------------------------------
>
> Key: FLINK-3427
> URL: https://issues.apache.org/jira/browse/FLINK-3427
> Project: Flink
> Issue Type: Improvement
> Components: Streaming, Webfrontend
> Reporter: Robert Metzger
> Assignee: Ivan Mushketyk
>
> Currently, its quite hard to figure out issues with the watermarks.
> I think we can improve the situation by reporting the following information
> through the metrics system:
> - Report the current low watermark for each operator (this way, you can see
> if one operator is preventing the watermarks to rise)
> - Report the number of events arrived after the low watermark (users can see
> how accurate the watermarks are)
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