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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-1692) ConcurrentModificationException in fair scheduler AppSchedulable
Date Fri, 07 Feb 2014 02:02:19 GMT
Sangjin Lee created YARN-1692:
---------------------------------

             Summary: 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


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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