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https://issues.apache.org/jira/browse/SPARK-21715?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ye Zhou updated SPARK-21715:
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    Attachment: Performance.png

> History Server respondes history page html content multiple times for only 
> one http request
> -------------------------------------------------------------------------------------------
>
>                 Key: SPARK-21715
>                 URL: https://issues.apache.org/jira/browse/SPARK-21715
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.1.0, 2.2.0, 2.3.0
>            Reporter: Ye Zhou
>            Priority: Minor
>             Fix For: 2.3.0
>
>         Attachments: Performance.png
>
>
> UI looks fine for the home page. But we check the performance for each 
> individual components, we found that there are three picture downloading 
> requests which takes much longer time than expected: favicon.ico, 
> sort_both.png, sort_desc.png. 
> These are the list of the request address: http://hostname:port/favicon.ico, 
> http://hostname:port/images/sort_both.png, 
> http://hostname:port/images/sort_desc.png. Later if user clicks on the head 
> of the table to sort the column, another request for 
> http://hostname:port/images/sort_asc.png will be sent.
> Browsers will send request for favicon.ico in default. And all these three 
> sort_xxx.png are the default behavior in dataTables jQuery plugin.
> Spark history server will start several handlers to handle http request. But 
> none of these requests are getting correctly handled and they are all 
> triggering the history server to respond the history page html content. As we 
> can find from the screenshot, the response data type are all "text/html".
> To solve this problem, We need to download those images dir from here: 
> https://github.com/DataTables/Plugins/tree/master/integration/bootstrap/images.
>  Put the folder under "core/src/main/resources/org/apache/spark/ui/static/". 
> We also need to modify the dataTables.bootstrap.css to get the correct images 
> location. For favicon.ico downloading request, we need to add one line in the 
> html header to disable the downloading. 
> I can post a pull request if this is the correct way to fix this. I have 
> tried it which works fine.



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