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From "qingwu.fu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1458) hadoop2.2.0 fairscheduler ResourceManager Event Processor thread blocked
Date Fri, 29 Nov 2013 11:09:35 GMT

    [ https://issues.apache.org/jira/browse/YARN-1458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13835314#comment-13835314
] 

qingwu.fu commented on YARN-1458:
---------------------------------

Hi Sandy,
     Just now, we print some mark in the FairScheduler.getAppWeight() method. Fortunately
, we maked the error appears again. We found that the FairScheduler.getAppWeight() method
was called repeat frequently. The lock of FairScheduler object was occupied by the  FairScheduler.getAppWeight(),
it seams like the  ResourceManager Event Processor didn't have opportunity to get the lock.
So, it's blocked.

> 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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