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Posted to yarn-issues@hadoop.apache.org by "Jian He (JIRA)" <ji...@apache.org> on 2017/10/31 18:31:00 UTC
[jira] [Commented] (YARN-7218) ApiServer REST API naming convention
/ws/v1 is already used in Hadoop v2
[ https://issues.apache.org/jira/browse/YARN-7218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16227280#comment-16227280 ]
Jian He commented on YARN-7218:
-------------------------------
Given that YARN-6626 is done, should this be closed ?
> 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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