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

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-3427?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek updated FLINK-3427:
------------------------------------
    Component/s:     (was: Streaming)
                 DataStream API

> 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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