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https://issues.apache.org/jira/browse/YARN-3508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14609402#comment-14609402
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Hadoop QA commented on YARN-3508:
---------------------------------

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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 28s | Pre-patch trunk compilation is 
healthy. |
| {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 3 new or modified test files. |
| {color:green}+1{color} | javac |   7m 57s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |   9m 45s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 22s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:red}-1{color} | checkstyle |   0m 49s | The applied patch generated  6 
new checkstyle issues (total was 249, now 250). |
| {color:green}+1{color} | whitespace |   0m  2s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   1m 33s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 34s | 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:red}-1{color} | yarn tests |  61m 26s | Tests failed in 
hadoop-yarn-server-resourcemanager. |
| | | 100m 29s | |
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|| Reason || Tests ||
| Timed out tests | 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.TestNodeLabelContainerAllocation
 |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12742972/YARN-3508.06.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / d0cc038 |
| checkstyle |  
https://builds.apache.org/job/PreCommit-YARN-Build/8399/artifact/patchprocess/diffcheckstylehadoop-yarn-server-resourcemanager.txt
 |
| hadoop-yarn-server-resourcemanager test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/8399/artifact/patchprocess/testrun_hadoop-yarn-server-resourcemanager.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/8399/testReport/ |
| Java | 1.7.0_55 |
| uname | Linux asf904.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/8399/console |


This message was automatically generated.

> Preemption processing occuring on the main RM dispatcher
> --------------------------------------------------------
>
>                 Key: YARN-3508
>                 URL: https://issues.apache.org/jira/browse/YARN-3508
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager, scheduler
>    Affects Versions: 2.6.0
>            Reporter: Jason Lowe
>            Assignee: Varun Saxena
>         Attachments: YARN-3508.002.patch, YARN-3508.01.patch, 
> YARN-3508.03.patch, YARN-3508.04.patch, YARN-3508.05.patch, YARN-3508.06.patch
>
>
> We recently saw the RM for a large cluster lag far behind on the 
> AsyncDispacher event queue.  The AsyncDispatcher thread was consistently 
> blocked on the highly-contended CapacityScheduler lock trying to dispatch 
> preemption-related events for RMContainerPreemptEventDispatcher.  Preemption 
> processing should occur on the scheduler event dispatcher thread or a 
> separate thread to avoid delaying the processing of other events in the 
> primary dispatcher queue.



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