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https://issues.apache.org/jira/browse/YARN-2910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14240172#comment-14240172
]
Hudson commented on YARN-2910:
------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #6683 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/6683/])
YARN-2910. FSLeafQueue can throw ConcurrentModificationException. (Wilfred
Spiegelenburg via kasha) (kasha: rev a2e07a54561a57a83b943628ebbc53ed5ba52718)
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSLeafQueue.java
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSAppAttempt.java
* hadoop-yarn-project/CHANGES.txt
*
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/TestFSLeafQueue.java
> FSLeafQueue can throw ConcurrentModificationException
> -----------------------------------------------------
>
> Key: YARN-2910
> URL: https://issues.apache.org/jira/browse/YARN-2910
> Project: Hadoop YARN
> Issue Type: Bug
> Components: fairscheduler
> Affects Versions: 2.5.0, 2.6.0, 2.5.1, 2.5.2
> Reporter: Wilfred Spiegelenburg
> Assignee: Wilfred Spiegelenburg
> Fix For: 2.7.0
>
> Attachments: FSLeafQueue_concurrent_exception.txt,
> YARN-2910.004.patch, YARN-2910.1.patch, YARN-2910.2.patch, YARN-2910.3.patch,
> YARN-2910.4.patch, YARN-2910.5.patch, YARN-2910.6.patch, YARN-2910.7.patch,
> YARN-2910.8.patch, YARN-2910.patch
>
>
> The list that maintains the runnable and the non runnable apps are a standard
> ArrayList but there is no guarantee that it will only be manipulated by one
> thread in the system. This can lead to the following exception:
> {noformat}
> 2014-11-12 02:29:01,169 ERROR [RMCommunicator Allocator]
> org.apache.hadoop.mapreduce.v2.app.rm.RMContainerAllocator: ERROR IN
> CONTACTING RM.
> java.util.ConcurrentModificationException:
> java.util.ConcurrentModificationException
> at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859)
> at java.util.ArrayList$Itr.next(ArrayList.java:831)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSLeafQueue.getResourceUsage(FSLeafQueue.java:147)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSAppAttempt.getHeadroom(FSAppAttempt.java:180)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.allocate(FairScheduler.java:923)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService.allocate(ApplicationMasterService.java:516)
> {noformat}
> Full stack trace in the attached file.
> We should guard against that by using a thread safe version from
> java.util.concurrent.CopyOnWriteArrayList
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