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https://issues.apache.org/jira/browse/YARN-3916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14623931#comment-14623931
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Hadoop QA commented on YARN-3916:
---------------------------------

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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | pre-patch |  16m 13s | 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:green}+1{color} | javac |   7m 42s | There were no new javac warning 
messages. |
| {color:green}+1{color} | javadoc |   9m 35s | 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:green}+1{color} | checkstyle |   0m 56s | 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 21s | mvn install still works. |
| {color:green}+1{color} | eclipse:eclipse |   0m 34s | The patch built with 
eclipse:eclipse. |
| {color:green}+1{color} | findbugs |   1m 34s | The patch does not introduce 
any new Findbugs (version 3.0.0) warnings. |
| {color:green}+1{color} | yarn tests |   1m 56s | Tests passed in 
hadoop-yarn-common. |
| | |  40m 16s | |
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|| Subsystem || Report/Notes ||
| Patch URL | 
http://issues.apache.org/jira/secure/attachment/12744944/YARN-3916.02.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / d7319de |
| hadoop-yarn-common test log | 
https://builds.apache.org/job/PreCommit-YARN-Build/8513/artifact/patchprocess/testrun_hadoop-yarn-common.txt
 |
| Test Results | 
https://builds.apache.org/job/PreCommit-YARN-Build/8513/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/8513/console |


This message was automatically generated.

> DrainDispatcher#await should wait till event has been completely handled
> ------------------------------------------------------------------------
>
>                 Key: YARN-3916
>                 URL: https://issues.apache.org/jira/browse/YARN-3916
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: resourcemanager
>    Affects Versions: 2.7.0
>            Reporter: Varun Saxena
>            Assignee: Varun Saxena
>            Priority: Critical
>         Attachments: YARN-3916.01.patch, YARN-3916.02.patch
>
>
> DrainDispatcher#await should wait till event has been completely handled.
> Currently it only checks for whether event queue has become empty.
> And in many tests we directly check for a state to be changed after calling 
> await.
> Sometimes, the states do not change by the time we check them as event has 
> not been completely handled.
> *This is causing test failures* such as YARN-3909 and YARN-3910 and may cause 
> other test failures as well.



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