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https://issues.apache.org/jira/browse/YARN-4105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14727547#comment-14727547
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Hadoop QA commented on YARN-4105:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | pre-patch |  16m 23s | Pre-patch trunk has 1 extant 
Findbugs (version 3.0.0) warnings. |
| {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 |   7m 58s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |  10m 15s | 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 52s | There were no new checkstyle 
issues. |
| {color:red}-1{color} | whitespace |   0m  0s | The patch has 1  line(s) that 
end in whitespace. Use git apply --whitespace=fix. |
| {color:green}+1{color} | install |   1m 29s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 33s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   1m 31s | The patch does not introduce 
any new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | yarn tests |  53m 51s | Tests passed in 
hadoop-yarn-server-resourcemanager. |
| | |  93m 19s | |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12753776/YARN-4105.2.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 7d6687f |
| Pre-patch Findbugs warnings | 
https://builds.apache.org/job/PreCommit-YARN-Build/8975/artifact/patchprocess/trunkFindbugsWarningshadoop-yarn-server-resourcemanager.html
 |
| whitespace | 
https://builds.apache.org/job/PreCommit-YARN-Build/8975/artifact/patchprocess/whitespace.txt
 |
| hadoop-yarn-server-resourcemanager test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/8975/artifact/patchprocess/testrun_hadoop-yarn-server-resourcemanager.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/8975/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf905.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/8975/console |


This message was automatically generated.

> Capacity Scheduler headroom for DRF is wrong
> --------------------------------------------
>
>                 Key: YARN-4105
>                 URL: https://issues.apache.org/jira/browse/YARN-4105
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Chang Li
>            Assignee: Chang Li
>         Attachments: YARN-4105.2.patch, YARN-4105.patch
>
>
> relate to the problem discussed in YARN-1857. But the min method is flawed 
> when we are using DRC. Have run into a real scenario in production where 
> queueCapacity: <memory:1056256, vCores:3750>, qconsumed: <memory:1054720, 
> vCores:361>, consumed: <memory:125952, vCores:170> limit: <memory:214016, 
> vCores:755>.  headRoom calculation returns 88064 where there is only 1536 
> left in the queue because DRC effectively compare by vcores. It then caused 
> deadlock because RMcontainer allocator thought there is still space for 
> mapper and won't preempt a reducer in a full queue to schedule a mapper. 
> Propose fix with componentwiseMin. 



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