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https://issues.apache.org/jira/browse/YARN-301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13541592#comment-13541592
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shenhong commented on YARN-301:
-------------------------------
The reason is when the thread SchedulerEventDispatche assignContainer, it
will get priorities from AppSchedulingInfo, at AppSchedulingInfo the code is:
synchronized public Collection<Priority> getPriorities() {
return priorities;
}
but it just get the reference of priorities, in AppSchedulable#assignContainer,
it traverse the priorities.
// (not scheduled) in order to promote better locality.
for (Priority priority : app.getPriorities()) {
app.addSchedulingOpportunity(priority);
...
On the other hand, when the RM processing the request from AM and update the
priorities at AppSchedulingInfo#updateResourceRequests:
if (asks == null) {
asks = new HashMap<String, ResourceRequest>();
this.requests.put(priority, asks);
this.priorities.add(priority);
} else if (updatePendingResources) {
it turn out to concurrentModificationException.
> Fairscheduler appear to concurrentModificationException and RM crash
> --------------------------------------------------------------------
>
> Key: YARN-301
> URL: https://issues.apache.org/jira/browse/YARN-301
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager, scheduler
> Reporter: shenhong
> Fix For: 2.0.3-alpha
>
>
> In my test cluster, fairscheduler appear to concurrentModificationException
> and RM crash, here is the message:
> 2012-12-30 17:14:17,171 FATAL
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Error in
> handling event type NODE_UPDATE to the scheduler
> java.util.ConcurrentModificationException
> at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1100)
> at java.util.TreeMap$KeyIterator.next(TreeMap.java:1154)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.AppSchedulable.assignContainer(AppSchedulable.java:297)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSLeafQueue.assignContainer(FSLeafQueue.java:181)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.nodeUpdate(FairScheduler.java:780)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:842)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:98)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$SchedulerEventDispatcher$EventProcessor.run(ResourceManager.java:340)
> at java.lang.Thread.run(Thread.java:662)
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