AMS Collector is started, but no web app service

[闰土0587 <li...@dtdream.com>]

AMS Collector could be started, but after that there is a no-interval repetition of error like this:2016-09-27 18:35:31,561 ERROR org.mortbay.log: /ws/v1/timeline/metrics
java.lang.IllegalStateException: STREAM
 at org.mortbay.jetty.Response.getWriter(Response.java:616)
 at org.apache.hadoop.yarn.webapp.View.writer(View.java:141)
 at org.apache.hadoop.yarn.webapp.view.TextView.writer(TextView.java:38)
 at org.apache.hadoop.yarn.webapp.view.TextView.echo(TextView.java:46)
 at org.apache.hadoop.yarn.webapp.view.TextView.puts(TextView.java:57)
 at org.apache.hadoop.yarn.webapp.view.HtmlPage.render(HtmlPage.java:81)
 at org.apache.hadoop.yarn.webapp.Dispatcher.render(Dispatcher.java:197)
 at org.apache.hadoop.yarn.webapp.Dispatcher.service(Dispatcher.java:145)
 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:909)
 at com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:843)
 at com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:804)
 at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:163)
 at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58)
 at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)
 at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)
 at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
 at org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter.doFilter(StaticUserWebFilter.java:109)
 at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
 at org.apache.hadoop.http.HttpServer2$QuotingInputFilter.doFilter(HttpServer2.java:1243)
 at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
 at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)
 at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
 at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:399)
 at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
 at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
 at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:767)
 at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
 at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
 at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
 at org.mortbay.jetty.Server.handle(Server.java:326)
 at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
 at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:945)
 at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
 at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
 at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
 at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
 at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
So what's wrong? the configuration or the port?