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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1692) ConcurrentModificationException in fair scheduler AppSchedulable
Date Sat, 08 Feb 2014 03:08:19 GMT

    [ https://issues.apache.org/jira/browse/YARN-1692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13895402#comment-13895402

Hadoop QA commented on YARN-1692:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision .

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

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {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
1.3.9) warnings.

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

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager.

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

Test results: https://builds.apache.org/job/PreCommit-YARN-Build/3043//testReport/
Console output: https://builds.apache.org/job/PreCommit-YARN-Build/3043//console

This message is automatically generated.

> ConcurrentModificationException in fair scheduler AppSchedulable
> ----------------------------------------------------------------
>                 Key: YARN-1692
>                 URL: https://issues.apache.org/jira/browse/YARN-1692
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: scheduler
>    Affects Versions: 2.0.5-alpha
>            Reporter: Sangjin Lee
>            Assignee: Sangjin Lee
>         Attachments: yarn-1692.patch
> We saw a ConcurrentModificationException thrown in the fair scheduler:
> {noformat}
> 2014-02-07 01:40:01,978 ERROR org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler:
Exception in fair scheduler UpdateThread
> java.util.ConcurrentModificationException
>         at java.util.HashMap$HashIterator.nextEntry(HashMap.java:926)
>         at java.util.HashMap$ValueIterator.next(HashMap.java:954)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.AppSchedulable.updateDemand(AppSchedulable.java:85)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSLeafQueue.updateDemand(FSLeafQueue.java:125)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSParentQueue.updateDemand(FSParentQueue.java:82)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.update(FairScheduler.java:217)
>         at org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler$UpdateThread.run(FairScheduler.java:195)
>         at java.lang.Thread.run(Thread.java:724)
> {noformat}
> The map that  gets returned by FSSchedulerApp.getResourceRequests() are iterated on without
proper synchronization.

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