[
https://issues.apache.org/jira/browse/YARN-4416?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Naganarasimha G R updated YARN-4416:
------------------------------------
Description:
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.
Hence we need to ensure following :
was:
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.
> 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: Sub-task
> 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.
> Hence we need to ensure following :
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
