Eric Yang created YARN-7218:
-------------------------------

             Summary: ApiServer REST API naming convention /ws/v1 is already 
used in Hadoop v2
                 Key: YARN-7218
                 URL: https://issues.apache.org/jira/browse/YARN-7218
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: api, applications
            Reporter: Eric Yang
            Assignee: Eric Yang


In YARN-6626, there is a desire to have ability to run ApiServer REST API in 
Resource Manager, this can eliminate the requirement to deploy another daemon 
service for submitting docker applications.  In YARN-5698, a new UI has been 
implemented as a separate web application.  There are some problems in the 
arrangement that can cause conflicts of how Java session are being managed.  
The root context of Resource Manager web application is /ws.  This is hard 
coded in startWebapp method in ResourceManager.java.  This means all the 
session management is applied to Web URL of /ws prefix.  /ui2 is independent of 
/ws context, therefore session management code doesn't apply to /ui2.  This 
could be a session management problem, if servlet based code is going to be 
introduced into /ui2 web application.

ApiServer code base is designed as a separate web application.  There is no 
easy way to inject a separate web application into the same /ws context because 
ResourceManager is already setup to bind to RMWebServices.  Unless ApiServer 
code is moved into RMWebServices, otherwise, they will not share the same 
session management.

The alternate solution is to keep ApiServer prefix URL independent of /ws 
context.  However, this will be a departure from YARN web services naming 
convention.  This can be loaded as a separate web application in Resource 
Manager jetty server.  One possible proposal is /app/v1/services.  This can 
keep ApiServer code modular and independent from Resource Manager.



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