Sunil G commented on YARN-4416:

bq.i have added locks for the access of schedulableEntities in 
AbstractComparatorOrderingPolicy but not completely sure of the modifications 
as there already synchronization on entitiesToReorder. So would like 
additional(/focused) review for this part in particular

AbstractComparatorOrderingPolicy or OrderingPolicy is accessed under the lock 
from LeafQueue. This dependency does exists now. I feel, its better to access 
this via LeafQueue lock.

> Deadlock due to synchronised get Methods in AbstractCSQueue
> -----------------------------------------------------------
>                 Key: YARN-4416
>                 URL: https://issues.apache.org/jira/browse/YARN-4416
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacity scheduler, resourcemanager
>    Affects Versions: 2.7.1
>            Reporter: Naganarasimha G R
>            Assignee: Naganarasimha G R
>            Priority: Minor
>         Attachments: YARN-4416.v1.001.patch, YARN-4416.v1.002.patch, 
> deadlock.log
> While debugging in eclipse came across a scenario where in i had to get to 
> know the name of the queue but every time i tried to see the queue it was 
> getting hung. On seeing the stack realized there was a deadlock but on 
> analysis found out that it was only due to *queue.toString()* during 
> debugging as {{AbstractCSQueue.getAbsoluteUsedCapacity}} was synchronized.
> Still i feel {{AbstractCSQueue}}'s getter methods need not be synchronized 
> and better be handled through read and write locks.

This message was sent by Atlassian JIRA

Reply via email to