[ 
https://issues.apache.org/jira/browse/YARN-3508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14564007#comment-14564007
 ] 

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 |  17m 43s | 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 1 new or modified test files. |
| {color:red}-1{color} | javac |   9m  9s | The applied patch generated  6  
additional warning messages. |
| {color:green}+1{color} | javadoc |  11m 16s | There were no new javadoc 
warning messages. |
| {color:green}+1{color} | release audit |   0m 30s | The applied patch does 
not increase the total number of release audit warnings. |
| {color:red}-1{color} | checkstyle |   0m 55s | The applied patch generated  3 
new checkstyle issues (total was 53, now 55). |
| {color:green}+1{color} | whitespace |   0m  0s | The patch has no lines that 
end in whitespace. |
| {color:green}+1{color} | install |   2m 12s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 39s | The patch built with 
eclipse:eclipse. |
| {color:red}-1{color} | findbugs |   1m 48s | The patch appears to introduce 1 
new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | yarn tests |  51m 54s | Tests passed in 
hadoop-yarn-server-resourcemanager. |
| | |  96m 10s | |
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|| Reason || Tests ||
| FindBugs | module:hadoop-yarn-server-resourcemanager |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12735991/YARN-3508.01.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / 9acd24f |
| javac | 
https://builds.apache.org/job/PreCommit-YARN-Build/8120/artifact/patchprocess/diffJavacWarnings.txt
 |
| checkstyle |  
https://builds.apache.org/job/PreCommit-YARN-Build/8120/artifact/patchprocess/diffcheckstylehadoop-yarn-server-resourcemanager.txt
 |
| Findbugs warnings | 
https://builds.apache.org/job/PreCommit-YARN-Build/8120/artifact/patchprocess/newPatchFindbugsWarningshadoop-yarn-server-resourcemanager.html
 |
| hadoop-yarn-server-resourcemanager test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/8120/artifact/patchprocess/testrun_hadoop-yarn-server-resourcemanager.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/8120/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/8120/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-3508.01.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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