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From "Aljoscha Krettek (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (FLINK-3427) Add watermark monitoring to JobManager web frontend
Date Mon, 03 Apr 2017 12:27:42 GMT

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

Aljoscha Krettek reopened FLINK-3427:
-------------------------------------

> 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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