[ 
https://issues.apache.org/jira/browse/YARN-4204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14907276#comment-14907276
 ] 

Hadoop QA commented on YARN-4204:
---------------------------------

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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  16m 59s | Pre-patch trunk compilation is 
healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:green}+1{color} | tests included |   0m  0s | The patch appears to 
include 1 new or modified test files. |
| {color:green}+1{color} | javac |   8m 54s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |  10m  9s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 23s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   0m 49s | There were no new checkstyle 
issues. |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 27s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 34s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   1m 29s | The patch does not introduce 
any new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | yarn tests |  57m 44s | Tests passed in 
hadoop-yarn-server-resourcemanager. |
| | |  98m 33s | |
\\
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12762226/YARN-4204.002.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / d1b9b85 |
| hadoop-yarn-server-resourcemanager test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/9259/artifact/patchprocess/testrun_hadoop-yarn-server-resourcemanager.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/9259/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf903.gq1.ygridcore.net 3.13.0-36-lowlatency #63-Ubuntu SMP 
PREEMPT Wed Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Console output | 
https://builds.apache.org/job/PreCommit-YARN-Build/9259/console |


This message was automatically generated.

> ConcurrentModificationException in FairSchedulerQueueInfo
> ---------------------------------------------------------
>
>                 Key: YARN-4204
>                 URL: https://issues.apache.org/jira/browse/YARN-4204
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Anubhav Dhoot
>            Assignee: Anubhav Dhoot
>         Attachments: YARN-4204.001.patch, YARN-4204.002.patch
>
>
> Saw this exception which caused RM to go down
> {noformat}
> java.util.ConcurrentModificationException
>       at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
>       at java.util.ArrayList$Itr.next(ArrayList.java:851)
>       at 
> java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1042)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.FairSchedulerQueueInfo.<init>(FairSchedulerQueueInfo.java:100)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.webapp.dao.FairSchedulerInfo.<init>(FairSchedulerInfo.java:46)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.webapp.RMWebServices.getSchedulerInfo(RMWebServices.java:229)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.lang.reflect.Method.invoke(Method.java:497)
>       at 
> com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
>       at 
> com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185)
>       at 
> com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
>       at 
> com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
>       at 
> com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
>       at 
> com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
>       at 
> com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
>       at 
> com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
>       at 
> com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469)
>       at 
> com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400)
>       at 
> com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349)
>       at 
> com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339)
>       at 
> com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
>       at 
> com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
>       at 
> com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:886)
>       at 
> com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:834)
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.webapp.RMWebAppFilter.doFilter(RMWebAppFilter.java:84)
>       at 
> com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:795)
>       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$CachedChain.doFilter(ServletHandler.java:1212)
>       at 
> org.apache.hadoop.security.authentication.server.AuthenticationFilter.doFilter(AuthenticationFilter.java:589)
>       at 
> org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticationFilter.doFilter(DelegationTokenAuthenticationFilter.java:291)
>       at 
> org.apache.hadoop.security.authentication.server.AuthenticationFilter.doFilter(AuthenticationFilter.java:552)
>       at 
> org.apache.hadoop.yarn.server.security.http.RMAuthenticationFilter.doFilter(RMAuthenticationFilter.java:84)
>       at 
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
>       at 
> org.apache.hadoop.http.HttpServer2$QuotingInputFilter.doFilter(HttpServer2.java:1279)
>       at 
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
>       at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)
>       at 
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1212)
>       at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)
>       at 
> org.mortbay.jetty.servlet.ServletHandler$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$RequestHandler.headerComplete(HttpConnection.java:928)
>       at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)
>       at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
>       at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
>       at 
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
>       at 
> org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
> {noformat}



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