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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2313) Livelock can occur on FairScheduler when there are lots entry in queue
Date Mon, 21 Jul 2014 12:59:38 GMT

    [ https://issues.apache.org/jira/browse/YARN-2313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14068478#comment-14068478
] 

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/12656855/YARN-2313.4.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-server/hadoop-yarn-server-resourcemanager:

                  org.apache.hadoop.yarn.server.resourcemanager.webapp.TestRMWebServices
                  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/4382//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/4382//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, YARN-2313.4.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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