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https://issues.apache.org/jira/browse/YARN-2313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14066091#comment-14066091
 ] 

Hadoop QA commented on YARN-2313:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12656445/YARN-2313.3.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author 
tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new 
or modified test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the 
total number of javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with 
eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new 
Findbugs (version 2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase 
the total number of release audit warnings.

    {color:red}-1 core tests{color}.  The patch failed these unit tests in 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager:

                  
org.apache.hadoop.yarn.server.resourcemanager.webapp.TestRMWebServices
                  
org.apache.hadoop.yarn.server.resourcemanager.applicationsmanager.TestAMRestart
                  
org.apache.hadoop.yarn.server.resourcemanager.webapp.TestRMWebServicesCapacitySched
                  
org.apache.hadoop.yarn.server.resourcemanager.webapp.TestRMWebServicesDelegationTokens
                  
org.apache.hadoop.yarn.server.resourcemanager.webapp.TestRMWebServicesAppsModification
                  
org.apache.hadoop.yarn.server.resourcemanager.webapp.TestRMWebServicesNodes
                  
org.apache.hadoop.yarn.server.resourcemanager.webapp.TestRMWebServicesApps
                  
org.apache.hadoop.yarn.server.resourcemanager.webapp.TestRMWebServicesFairScheduler

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: 
https://builds.apache.org/job/PreCommit-YARN-Build/4356//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/4356//console

This message is automatically generated.

> Livelock can occur on FairScheduler when there are lots entry in queue
> ----------------------------------------------------------------------
>
>                 Key: YARN-2313
>                 URL: https://issues.apache.org/jira/browse/YARN-2313
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: fairscheduler
>    Affects Versions: 2.4.1
>            Reporter: Tsuyoshi OZAWA
>            Assignee: Tsuyoshi OZAWA
>         Attachments: YARN-2313.1.patch, YARN-2313.2.patch, YARN-2313.3.patch, 
> rm-stack-trace.txt
>
>
> Observed livelock on FairScheduler when there are lots entry in queue. After 
> my investigating code, following case can occur:
> 1. {{update()}} called by UpdateThread takes longer times than 
> UPDATE_INTERVAL(500ms) if there are lots queue.
> 2. UpdateThread goes busy loop.
> 3. Other threads(AllocationFileReloader, 
> ResourceManager$SchedulerEventDispatcher) can wait forever.



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