[jira] [Commented] (FLINK-3427) Add watermark monitoring to JobManager web frontend

["Vladislav Pernin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15953612#comment-15953612 ] 

Vladislav Pernin commented on FLINK-3427:
-----------------------------------------

What is the official way of monitoring backpressure ?
The rest_api is not documented any more and sends a "deprecated" response.

Shouldn't it be part of the metrics system ?

> 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: DataStream API, Webfrontend
>            Reporter: Robert Metzger
>             Fix For: 1.3.0
>
>
> 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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