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https://issues.apache.org/jira/browse/YARN-1550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14014370#comment-14014370
 ] 

Hadoop QA commented on YARN-1550:
---------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12647711/YARN-1550.002.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author 
tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new 
or modified test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the 
total number of javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with 
eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new 
Findbugs (version 1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase 
the total number of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: 
https://builds.apache.org/job/PreCommit-YARN-Build/3870//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/3870//console

This message is automatically generated.

> NPE in FairSchedulerAppsBlock#render
> ------------------------------------
>
>                 Key: YARN-1550
>                 URL: https://issues.apache.org/jira/browse/YARN-1550
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: scheduler
>    Affects Versions: 2.2.0
>            Reporter: caolong
>            Priority: Critical
>             Fix For: 2.2.1
>
>         Attachments: YARN-1550.001.patch, YARN-1550.002.patch, YARN-1550.patch
>
>
> three Steps :
> 1、debug at RMAppManager#submitApplication after code
> if (rmContext.getRMApps().putIfAbsent(applicationId, application) !=
>         null) {
>       String message = "Application with id " + applicationId
>           + " is already present! Cannot add a duplicate!";
>       LOG.warn(message);
>       throw RPCUtil.getRemoteException(message);
>     }
> 2、submit one application:hadoop jar 
> ~/hadoop-current/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.0.0-ydh2.2.0-tests.jar
>  sleep -Dhadoop.job.ugi=test2,#111111 -Dmapreduce.job.queuename=p1 -m 1 -mt 1 
> -r 1
> 3、go in page :http://ip:50030/cluster/scheduler and find 500 ERROR!
> the log:
> {noformat}
> 2013-12-30 11:51:43,795 ERROR org.apache.hadoop.yarn.webapp.Dispatcher: error 
> handling URI: /cluster/scheduler
> java.lang.reflect.InvocationTargetException
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         ....
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.hadoop.yarn.server.resourcemanager.webapp.FairSchedulerAppsBlock.render(FairSchedulerAppsBlock.java:96)
>       at 
> org.apache.hadoop.yarn.webapp.view.HtmlBlock.render(HtmlBlock.java:66)
>       at 
> org.apache.hadoop.yarn.webapp.view.HtmlBlock.renderPartial(HtmlBlock.java:76)
> {noformat}



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