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From "nemon lou (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-276) Capacity Scheduler can hang when submit many jobs concurrently
Date Mon, 24 Dec 2012 12:38:13 GMT

    [ https://issues.apache.org/jira/browse/YARN-276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13539260#comment-13539260
] 

nemon lou commented on YARN-276:
--------------------------------

updating the patch.
Four properties have been added to CS web page:
Max AM Used Per Queue Percent
Actual AM Used Per Queue Percent
Max AM Used Percent For Cluster
Actual AM Used Percent For Cluster

This patch keeps track of AM used resources and checks for it both at cluster level and leaf
Queue level.
                
> Capacity Scheduler can hang when submit many jobs concurrently
> --------------------------------------------------------------
>
>                 Key: YARN-276
>                 URL: https://issues.apache.org/jira/browse/YARN-276
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: capacityscheduler
>    Affects Versions: 3.0.0, 2.0.1-alpha
>            Reporter: nemon lou
>         Attachments: YARN-276.patch, YARN-276.patch, YARN-276.patch, YARN-276.patch,
YARN-276.patch, YARN-276.patch
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> In hadoop2.0.1,When i submit many jobs concurrently at the same time,Capacity scheduler
can hang with most resources taken up by AM and don't have enough resources for tasks.And
then all applications hang there.
> The cause is that "yarn.scheduler.capacity.maximum-am-resource-percent" not check directly.Instead
,this property only used for maxActiveApplications. And maxActiveApplications is computed
by minimumAllocation (not by Am actually used).

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