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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-8046) Revisit RMWebServiceProtocol implementations
Date Sun, 18 Mar 2018 15:37:00 GMT
Wangda Tan created YARN-8046:
--------------------------------

             Summary: Revisit RMWebServiceProtocol implementations
                 Key: YARN-8046
                 URL: https://issues.apache.org/jira/browse/YARN-8046
             Project: Hadoop YARN
          Issue Type: Improvement
            Reporter: Wangda Tan


I recently found that new changes of RMWebServiceProtocol make adding any new REST API pretty
hard. There're at least 6 classes need to be implemented:

1. {{MockRESTRequestInterceptor}}
2. {{FederationInterceptorREST}}
3. {{DefaultRequestInterceptorREST}}
4. {{PassThroughRESTRequestInterceptor}
5. {{RouterWebServices}}
6. {{RMWebServices}}

Different classes implementations have different styles, simple copy-paste is not enough.
For example.

{{DefaultRequestInterceptorREST}} uses {{RouterWebServiceUtil.genericForward}} to pass all
parameters, which needs to understand how each REST API works, reconstruct an URL which can
easily cause issues.

I think we should revisit these APIs and make sure new API can be easier added to REST interface
like before.



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