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https://issues.apache.org/jira/browse/YARN-4047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14692412#comment-14692412
 ] 

Hadoop QA commented on YARN-4047:
---------------------------------

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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 47s | 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 |   8m  1s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |   9m 59s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 24s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:green}+1{color} | checkstyle |   0m 50s | 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 22s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 33s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   1m 27s | The patch does not introduce 
any new Findbugs (version 3.0.0) warnings. |
| {color:red}-1{color} | yarn tests |  53m 27s | Tests failed in 
hadoop-yarn-server-resourcemanager. |
| | |  92m 53s | |
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|| Reason || Tests ||
| Failed unit tests | 
hadoop.yarn.server.resourcemanager.scheduler.capacity.TestContainerAllocation |
|   | hadoop.yarn.server.resourcemanager.TestRMAdminService |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12749935/YARN-4047.001.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 7c796fd |
| hadoop-yarn-server-resourcemanager test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/8824/artifact/patchprocess/testrun_hadoop-yarn-server-resourcemanager.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/8824/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/8824/console |


This message was automatically generated.

> ClientRMService getApplications has high scheduler lock contention
> ------------------------------------------------------------------
>
>                 Key: YARN-4047
>                 URL: https://issues.apache.org/jira/browse/YARN-4047
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>              Labels: 2.6.1-candidate
>         Attachments: YARN-4047.001.patch
>
>
> The getApplications call can be particuarly expensive because the code can 
> call checkAccess on every application being tracked by the RM.  checkAccess 
> will often call scheduler.checkAccess which will grab the big scheduler lock. 
>  This can cause a lot of contention with the scheduler thread which is busy 
> trying to process node heartbeats, app allocation requests, etc.



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