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From "zhihai xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-1458) In Fair Scheduler, size based weight can cause update thread to hold lock indefinitely
Date Tue, 09 Sep 2014 03:35:29 GMT

    [ https://issues.apache.org/jira/browse/YARN-1458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14126533#comment-14126533
] 

zhihai xu commented on YARN-1458:
---------------------------------

I uploaded a new patch "YARN-1458.alternative2.patch" which add a new test case:all queues
have none zero minShare:
queueA and queueB each have eight 0.5 and minShare 1024,
the cluster have resource 8192. so each queue should have 4096 fair share.

> In Fair Scheduler, size based weight can cause update thread to hold lock indefinitely
> --------------------------------------------------------------------------------------
>
>                 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
>            Assignee: zhihai xu
>              Labels: patch
>             Fix For: 2.2.1
>
>         Attachments: YARN-1458.001.patch, YARN-1458.002.patch, YARN-1458.003.patch, YARN-1458.004.patch,
YARN-1458.alternative0.patch, YARN-1458.alternative1.patch, YARN-1458.alternative2.patch,
YARN-1458.patch, yarn-1458-5.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:
> {code}
>  "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)
> {code}



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