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https://issues.apache.org/jira/browse/YARN-3087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14334188#comment-14334188
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Li Lu commented on YARN-3087:
-----------------------------

Hi [~zjshen], thanks for the feedback! Seems like these two classes are 
associated with YARN WebApp. Could you please let me know the general goal of 
the two classes? Maybe we can find our workaround in the HDFS codebase since 
they have already built their REST APIs on top of HttpServer2 and Jersey. 

> [Aggregator implementation] the REST server (web server) for per-node 
> aggregator does not work if it runs inside node manager
> -----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-3087
>                 URL: https://issues.apache.org/jira/browse/YARN-3087
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Sangjin Lee
>            Assignee: Devaraj K
>         Attachments: YARN-3087-022315.patch
>
>
> This is related to YARN-3030. YARN-3030 sets up a per-node timeline 
> aggregator and the associated REST server. It runs fine as a standalone 
> process, but does not work if it runs inside the node manager due to possible 
> collisions of servlet mapping.
> Exception:
> {noformat}
> org.apache.hadoop.yarn.webapp.WebAppException: /v2/timeline: controller for 
> v2 not found
>       at org.apache.hadoop.yarn.webapp.Router.resolveDefault(Router.java:232)
>       at org.apache.hadoop.yarn.webapp.Router.resolve(Router.java:140)
>       at org.apache.hadoop.yarn.webapp.Dispatcher.service(Dispatcher.java:134)
>       at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
>       at 
> com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263)
>       at 
> com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:178)
>       at 
> com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)
>       at 
> com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62)
>       at 
> com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:900)
>       at 
> com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:834)
>       at 
> com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:795)
> ...
> {noformat}



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