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https://issues.apache.org/jira/browse/YARN-276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13675840#comment-13675840
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Hadoop QA commented on YARN-276:
--------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12586295/YARN-276.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 6 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}.  The javadoc tool did not generate any 
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
 hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-tests.

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

Test results: 
https://builds.apache.org/job/PreCommit-YARN-Build/1122//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/1122//console

This message is automatically generated.
                
> Capacity Scheduler can hang when submit many jobs concurrently
> --------------------------------------------------------------
>
>                 Key: YARN-276
>                 URL: https://issues.apache.org/jira/browse/YARN-276
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 3.0.0, 2.0.1-alpha
>            Reporter: nemon lou
>            Assignee: nemon lou
>              Labels: incompatible
>         Attachments: YARN-276.patch, YARN-276.patch, YARN-276.patch, 
> YARN-276.patch, YARN-276.patch, YARN-276.patch, YARN-276.patch, 
> YARN-276.patch, YARN-276.patch, YARN-276.patch, YARN-276.patch, 
> YARN-276.patch, YARN-276.patch, YARN-276.patch, YARN-276.patch
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> In hadoop2.0.1,When i submit many jobs concurrently at the same time,Capacity 
> scheduler can hang with most resources taken up by AM and don't have enough 
> resources for tasks.And then all applications hang there.
> The cause is that "yarn.scheduler.capacity.maximum-am-resource-percent" not 
> check directly.Instead ,this property only used for maxActiveApplications. 
> And maxActiveApplications is computed by minimumAllocation (not by Am 
> actually used).

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