Sangjin Lee commented on YARN-3087:

We're getting around this by having the node manager host the timeline 
aggregator's web service. However, this is only a short term solution as it 
creates an undesirable dependency from node manager to timeline service.

If we need the per-node aggregator as an aux service (and a REST service), we 
do need to resolve this. The standalone mode will not be affected by this.

> 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
> 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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