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From "nemon lou (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-276) Capacity Scheduler can hang when submit many jobs concurrently
Date Tue, 18 Dec 2012 02:38:12 GMT
nemon lou created YARN-276:
------------------------------

             Summary: 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: 2.0.1-alpha, 3.0.0
            Reporter: nemon lou


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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