Jian He created YARN-2456:
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Summary: Possible deadlock 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
Reporter: Jian He
Assignee: Jian He
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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