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From "Wangda Tan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3091) [Umbrella] Improve and fix locks of RM scheduler
Date Fri, 23 Jan 2015 17:27:35 GMT

    [ https://issues.apache.org/jira/browse/YARN-3091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14289552#comment-14289552

Wangda Tan commented on YARN-3091:

Thanks for jumping in and provide your thoughts. [~gtCarrera], [~sunilg], [~ozawa], [~rohithsharma],

I've just updated title of this JIRA a little bit according to suggestions from [~gtCarrera].
I think it's better to put improvement and fix together in this ticket. Since they share a
lot of background works. And +1 to fix bugs prior to improvements, but it is possible we can
address both of them at some places.

I agree to run Jcarder first to pinpoint problems first, with that, we can get some valid
inputs. But I'm not sure what's the plan of HADOOP-9213, if it needs take more time, we can
do some works our side parallelly.

> [Umbrella] Improve and fix locks of RM scheduler
> ------------------------------------------------
>                 Key: YARN-3091
>                 URL: https://issues.apache.org/jira/browse/YARN-3091
>             Project: Hadoop YARN
>          Issue Type: Task
>          Components: capacityscheduler, fairscheduler, resourcemanager, scheduler
>            Reporter: Wangda Tan
> In existing YARN RM scheduler, there're some issues of using locks. For example:
> - Many unnecessary synchronized locks, we have seen several cases recently that too frequent
access of scheduler makes scheduler hang. Which could be addressed by using read/write lock.
Components include scheduler, CS queues, apps
> - Some fields not properly locked (Like clusterResource)
> We can address them together in this ticket.
> (More details see comments below)

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