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https://issues.apache.org/jira/browse/YARN-1458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13836103#comment-13836103
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Sandy Ryza commented on YARN-1458:
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Thanks for tracking this down. That makes a lot of sense. While the change
you propose may ultimately be what we choose fix this, I'd like to understand
why this is happening. I.e. resourceUsedWithWeightToResourceRatio should never
return 0, so we should find out what's causing it to return that.
For resourceUsedWithWeightToResourceRatio to return 0, computeShare must be
returning 0 for the schedulable. Here is computeShare:
{code}
double share = sched.getWeights().getWeight(type) * w2rRatio;
share = Math.max(share, getResourceValue(sched.getMinShare(), type));
share = Math.min(share, getResourceValue(sched.getMaxShare(), type));
return (int) share;
{code}
For computeShare to return 0, either the AppSchedulable's weight must be 0 or
the max share must be 0. An app's weight is 1, unless size based weight is
turned on or you've provided a custom weight adjuster. An app's max share is
always Integer.MAX_VALUE. Have you turned on size based weight or provided a
custom weight adjuster?
> hadoop2.2.0 fairscheduler ResourceManager Event Processor thread blocked
> ------------------------------------------------------------------------
>
> Key: YARN-1458
> URL: https://issues.apache.org/jira/browse/YARN-1458
> Project: Hadoop YARN
> Issue Type: Bug
> Components: scheduler
> Affects Versions: 2.2.0
> Environment: Centos 2.6.18-238.19.1.el5 X86_64
> hadoop2.2.0
> Reporter: qingwu.fu
> Labels: patch
> Original Estimate: 408h
> Remaining Estimate: 408h
>
> The ResourceManager$SchedulerEventDispatcher$EventProcessor blocked when
> clients submit lots jobs, it is not easy to reapear. We run the test cluster
> for days to reapear it. The output of jstack command on resourcemanager pid:
> "ResourceManager Event Processor" prio=10 tid=0x00002aaab0c5f000 nid=0x5dd3
> waiting for monitor entry [0x0000000043aa9000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.removeApplication(FairScheduler.java:671)
> - waiting to lock <0x000000070026b6e0> (a
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:1023)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.handle(FairScheduler.java:112)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager$SchedulerEventDispatcher$EventProcessor.run(ResourceManager.java:440)
> at java.lang.Thread.run(Thread.java:744)
> ……
> "FairSchedulerUpdateThread" daemon prio=10 tid=0x00002aaab0a2c800 nid=0x5dc8
> runnable [0x00000000433a2000]
> java.lang.Thread.State: RUNNABLE
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.getAppWeight(FairScheduler.java:545)
> - locked <0x000000070026b6e0> (a
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.AppSchedulable.getWeights(AppSchedulable.java:129)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.policies.ComputeFairShares.computeShare(ComputeFairShares.java:143)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.policies.ComputeFairShares.resourceUsedWithWeightToResourceRatio(ComputeFairShares.java:131)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.policies.ComputeFairShares.computeShares(ComputeFairShares.java:102)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.policies.FairSharePolicy.computeShares(FairSharePolicy.java:119)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSLeafQueue.recomputeShares(FSLeafQueue.java:100)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSParentQueue.recomputeShares(FSParentQueue.java:62)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.update(FairScheduler.java:282)
> - locked <0x000000070026b6e0> (a
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler$UpdateThread.run(FairScheduler.java:255)
> at java.lang.Thread.run(Thread.java:744)
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