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https://issues.apache.org/jira/browse/YARN-2456?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jian He updated YARN-2456:
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Attachment: YARN-2456.2.patch
patch rebased
> Possible livelock in CapacityScheduler when RM is recovering apps
> -----------------------------------------------------------------
>
> Key: YARN-2456
> URL: https://issues.apache.org/jira/browse/YARN-2456
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: resourcemanager
> Reporter: Jian He
> Assignee: Jian He
> Attachments: YARN-2456.1.patch, YARN-2456.2.patch
>
>
> Consider this scenario:
> 1. RM is configured with a single queue and only one application can be
> active at a time.
> 2. Submit App1 which uses up the queue's whole capacity
> 3. Submit App2 which remains pending.
> 4. Restart RM.
> 5. App2 is recovered before App1, so App2 is added to the activeApplications
> list. Now App1 remains pending (because of max-active-app limit)
> 6. All containers of App1 are now recovered when NM registers, and use up the
> whole queue capacity again.
> 7. Since the queue is full, App2 cannot proceed to allocate AM container.
> 8. In the meanwhile, App1 cannot proceed to become active because of the
> max-active-app limit
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