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https://issues.apache.org/jira/browse/TEZ-3488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15651151#comment-15651151
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Sreenath Somarajapuram commented on TEZ-3488:
---------------------------------------------

[~hitesh] I'v improved the above documentation. Please review. Working on the 
other parts of the doc.

bq. Is there any security aspect raised if we use "*" instead of the origin 
host as currently being done?
We cannot use "*" when withCredentials is set to true in the request. As 
explained here 
https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS#Requests_with_credentials,
 withCredentials is required for making calls that are aware of HTTP cookies 
and HTTP Authentication information. It was added as part of TEZ-1799.
[~jeagles] Considering that we are not sending any credentials as of now in the 
headers, should we remove the flag for the time being?

> Tez UI Vertex 404
> -----------------
>
>                 Key: TEZ-3488
>                 URL: https://issues.apache.org/jira/browse/TEZ-3488
>             Project: Apache Tez
>          Issue Type: Bug
>    Affects Versions: 0.8.4
>            Reporter: George Liaw
>
> When we're trying to view vertices for a running job, the Vertex page will 
> show a 404 error saying:
> "Could not retrieve expected data from @ <url>"
> And the Vertex Counter page will show:
> "Counters unavailable"
> and
> "Error code: Unknown, message: Resource Manager (RM) out of reach. Either 
> it's down or CORS is not enabled"
> The RMs are up and CORS is enabled. If we go to the displayed url, we get the 
> expected XML with the application info. When the DAG finishes running, those 
> errors go away and the pages display fine. Any idea what's going on here?



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