[ 
https://issues.apache.org/jira/browse/YARN-5543?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Jonathan Hung updated YARN-5543:
--------------------------------
    Labels: oct16-medium release-blocker  (was: oct16-medium)

> ResourceManager SchedulingMonitor could potentially terminate the preemption 
> checker thread
> -------------------------------------------------------------------------------------------
>
>                 Key: YARN-5543
>                 URL: https://issues.apache.org/jira/browse/YARN-5543
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler, resourcemanager
>    Affects Versions: 2.7.0, 2.6.1
>            Reporter: Min Shen
>            Assignee: Min Shen
>              Labels: oct16-medium, release-blocker
>         Attachments: YARN-5543.001.patch, YARN-5543.002.patch, 
> YARN-5543.003.patch, YARN-5543-branch-2.7.001.patch
>
>
> In SchedulingMonitor.java, when the service starts, it starts a checker 
> thread to perform Capacity Scheduler's preemption. However, the 
> implementation of this checker thread has the following issue:
> {code}
> while (!stopped && !Thread.currentThread().isInterrupted()) {
>     ....
>     try {
>       Thread.sleep(monitorInterval)
>     } catch (InterruptedException e) {
>       ....
>       break;
>     }
> }
> {code}
> The above code snippet will terminate the checker thread whenever it is 
> interrupted. 
> We noticed in our cluster that this could lead to CapacityScheduler's 
> preemption disabled unexpectedly due to the checker thread getting terminated.
> We propose to use ScheduledExecutorService to improve the robustness of this 
> part of the code to ensure the liveness of CapacityScheduler's preemption 
> functionality.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)

---------------------------------------------------------------------
To unsubscribe, e-mail: yarn-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: yarn-issues-h...@hadoop.apache.org

Reply via email to