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https://issues.apache.org/jira/browse/FLINK-6477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16004187#comment-16004187
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Chesnay Schepler commented on FLINK-6477:
-----------------------------------------

Well my explanation covers why this can work if one is lucky. The first call to 
load metrics starts a new metrics update, and gets nothing as a result. The 
second call to load metrics may actually get results if the fetching of the 
metrics finished between these 2 calls. But there's no guarantee that the 
fetching finishes in time, so this would introduce a race condition.

> The first time to click Taskmanager cannot get the actual data
> --------------------------------------------------------------
>
>                 Key: FLINK-6477
>                 URL: https://issues.apache.org/jira/browse/FLINK-6477
>             Project: Flink
>          Issue Type: Bug
>          Components: Webfrontend
>    Affects Versions: 1.2.0
>            Reporter: zhihao chen
>            Assignee: zhihao chen
>         Attachments: errDisplay.jpg
>
>
> Flink web page first click Taskmanager to get less than the actual data, when 
> the parameter “jobmanager.web.refresh-interval” is set to a larger value, eg: 
> 1800000, if you do not manually refresh the page you need to wait time after 
> the timeout normal display



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