[ 
https://issues.apache.org/jira/browse/YARN-6448?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Yufei Gu updated YARN-6448:
---------------------------
    Description: 
YARN-4719 remove the lock in continuous scheduling while sorting nodes. It 
breaks the order in comparison if nodes changes while sorting.
{code}
2017-04-04 23:42:26,123 FATAL 
org.apache.hadoop.yarn.server.resourcemanager.RMCriticalThreadUncaughtExceptionHandler:
 Critical thread FairSchedulerContinuousScheduling crashed!
java.lang.IllegalArgumentException: Comparison method violates its general 
contract!
        at java.util.TimSort.mergeHi(TimSort.java:899)
        at java.util.TimSort.mergeAt(TimSort.java:516)
        at java.util.TimSort.mergeForceCollapse(TimSort.java:457)
        at java.util.TimSort.sort(TimSort.java:254)
        at java.util.Arrays.sort(Arrays.java:1512)
        at java.util.ArrayList.sort(ArrayList.java:1454)
        at java.util.Collections.sort(Collections.java:175)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.ClusterNodeTracker.sortedNodeList(ClusterNodeTracker.java:306)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.continuousSchedulingAttempt(FairScheduler.java:884)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler$ContinuousSchedulingThread.run(FairScheduler.java:316)
{code}

  was:
YARN-4719 remove the lock in continuous scheduling while sorting nodes. It 
breaks the order in comparison if nodes changes while sorting.

2017-04-04 23:42:26,123 FATAL 
org.apache.hadoop.yarn.server.resourcemanager.RMCriticalThreadUncaughtExceptionHandler:
 Critical thread FairSchedulerContinuousScheduling crashed!
{code}
java.lang.IllegalArgumentException: Comparison method violates its general 
contract!
        at java.util.TimSort.mergeHi(TimSort.java:899)
        at java.util.TimSort.mergeAt(TimSort.java:516)
        at java.util.TimSort.mergeForceCollapse(TimSort.java:457)
        at java.util.TimSort.sort(TimSort.java:254)
        at java.util.Arrays.sort(Arrays.java:1512)
        at java.util.ArrayList.sort(ArrayList.java:1454)
        at java.util.Collections.sort(Collections.java:175)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.ClusterNodeTracker.sortedNodeList(ClusterNodeTracker.java:306)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.continuousSchedulingAttempt(FairScheduler.java:884)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler$ContinuousSchedulingThread.run(FairScheduler.java:316)
{code}


> Add back the lock in continuous scheduling while sorting nodes
> --------------------------------------------------------------
>
>                 Key: YARN-6448
>                 URL: https://issues.apache.org/jira/browse/YARN-6448
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.9.0, 3.0.0-alpha2
>            Reporter: Yufei Gu
>            Assignee: Yufei Gu
>         Attachments: YARN-6448.001.patch, YARN-6448.002.patch
>
>
> YARN-4719 remove the lock in continuous scheduling while sorting nodes. It 
> breaks the order in comparison if nodes changes while sorting.
> {code}
> 2017-04-04 23:42:26,123 FATAL 
> org.apache.hadoop.yarn.server.resourcemanager.RMCriticalThreadUncaughtExceptionHandler:
>  Critical thread FairSchedulerContinuousScheduling crashed!
> java.lang.IllegalArgumentException: Comparison method violates its general 
> contract!
>         at java.util.TimSort.mergeHi(TimSort.java:899)
>         at java.util.TimSort.mergeAt(TimSort.java:516)
>         at java.util.TimSort.mergeForceCollapse(TimSort.java:457)
>         at java.util.TimSort.sort(TimSort.java:254)
>         at java.util.Arrays.sort(Arrays.java:1512)
>         at java.util.ArrayList.sort(ArrayList.java:1454)
>         at java.util.Collections.sort(Collections.java:175)
>         at 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.ClusterNodeTracker.sortedNodeList(ClusterNodeTracker.java:306)
>         at 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler.continuousSchedulingAttempt(FairScheduler.java:884)
>         at 
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FairScheduler$ContinuousSchedulingThread.run(FairScheduler.java:316)
> {code}



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