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From "Varun Vasudev (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-4009) CORS support for ResourceManager REST API
Date Thu, 17 Sep 2015 13:19:05 GMT

    [ https://issues.apache.org/jira/browse/YARN-4009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14802894#comment-14802894
] 

Varun Vasudev commented on YARN-4009:
-------------------------------------

bq. What happens when both of these are enabled at the same time with different settings?

If the filter is set in core-site.xml, it will be enabled irrespective of the value set in
yarn.timeline-service.http-cross-origin.enabled. There is no change in behavior here - if
a user sets the existing timeline CORS filter in core-site.xml, it will override the value
set in yarn.timeline-service.http-cross-origin.enabled.

bq.  Is there a need to allow the design to enable this only for webservices (REST APIs) instead
of the whole webserver (builtin UIs and REST apis)?

I don't think there's any such need. As far as I can tell, we don't treat http requests differently
i.e. webservices and builtin UI requests are treated the same.

bq. Not sure if there is a question of selecting enabling cors support for different services
such as NN webservices vs RM webservices.

I thought about this - I'm not sure there's any benefit to adding one more set of config knobs.
The chances are if you're fine with enabling CORS for the RM, you're probably fine enabling
it for the NMs and the timeline server as well. If a user wishes to disable or enable CORS
for a particular service, they can always set the filter initializers to the appropriate value
on the node the service is running on(either via core-site.xml or yarn-site.xml).



> CORS support for ResourceManager REST API
> -----------------------------------------
>
>                 Key: YARN-4009
>                 URL: https://issues.apache.org/jira/browse/YARN-4009
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Prakash Ramachandran
>            Assignee: Varun Vasudev
>         Attachments: YARN-4009.001.patch, YARN-4009.002.patch, YARN-4009.003.patch, YARN-4009.004.patch
>
>
> Currently the REST API's do not have CORS support. This means any UI (running in browser)
cannot consume the REST API's. For ex Tez UI would like to use the REST API for getting application,
application attempt information exposed by the API's. 
> It would be very useful if CORS is enabled for the REST API's.



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