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https://issues.apache.org/jira/browse/YARN-4066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14910003#comment-14910003
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Hadoop QA commented on YARN-4066:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  16m 42s | Pre-patch trunk compilation is 
healthy. |
| {color:green}+1{color} | @author |   0m  0s | The patch does not contain any 
@author tags. |
| {color:red}-1{color} | tests included |   0m  0s | The patch doesn't appear 
to include any new or modified tests.  Please justify why no new tests are 
needed for this patch. Also please list what manual steps were performed to 
verify this patch. |
| {color:green}+1{color} | javac |   7m 50s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |  10m  2s | 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:red}-1{color} | checkstyle |   0m 50s | The applied patch generated  4 
new checkstyle issues (total was 15, now 18). |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 30s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 33s | 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 |  60m  3s | Tests passed in 
hadoop-yarn-server-resourcemanager. |
| | |  99m 25s | |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12762628/YARN-4066-2.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 1c030c6 |
| checkstyle |  
https://builds.apache.org/job/PreCommit-YARN-Build/9279/artifact/patchprocess/diffcheckstylehadoop-yarn-server-resourcemanager.txt
 |
| hadoop-yarn-server-resourcemanager test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/9279/artifact/patchprocess/testrun_hadoop-yarn-server-resourcemanager.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/9279/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/9279/console |


This message was automatically generated.

> Large number of queues choke fair scheduler
> -------------------------------------------
>
>                 Key: YARN-4066
>                 URL: https://issues.apache.org/jira/browse/YARN-4066
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.7.1
>            Reporter: Johan Gustavsson
>            Assignee: Johan Gustavsson
>         Attachments: YARN-4066-2.patch, yarn-4066-1.patch
>
>
> Due to synchronization and all the loops performed during queue creation, 
> setting a large amount of queues (12000+) will completely choke the 
> scheduler. To deal with this some optimization to 
> "QueueManager.updateAllocationConfiguration(AllocationConfiguration 
> queueConf)" should be done to reduce the amount of unnesecary loops. The 
> attached patch have been tested to work with atleast 96000 queues. 



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