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https://issues.apache.org/jira/browse/YARN-276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13675574#comment-13675574
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Thomas Graves commented on YARN-276:
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I need to spend more time looking through the new logic, here are a few more
comments for now.
remove the comment from overAMUsedPercent about max active application since
its no longer present.
FicaSchedulerApp getAMResource, change amRequedResource -> amRequiredResource
the max active applications per user used to use the absolute queue capacity
instead of the absolute max queue capacity. It was changed to use the absolute
capacity because it uses the userlimitfactor in the calculation, which should
be applied to the capacity and not max capacity (see MAPREDUCE-3897 for more
details). We should change the overAMUsedPercentPerUser similarly to use
absolute capacity, not absolute max capacity.
This can be filed as a separate jira since it was pre-existing but a bad app
that requests 0 for the memory could cause divide by zero exception.
> 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
> Assignee: nemon lou
> Labels: incompatible
> Attachments: YARN-276.patch, YARN-276.patch, YARN-276.patch,
> YARN-276.patch, YARN-276.patch, YARN-276.patch, YARN-276.patch,
> YARN-276.patch, 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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