Peng Zhang created YARN-3405:
--------------------------------
Summary: FairScheduler's preemption cannot happen between sibling
in some case
Key: YARN-3405
URL: https://issues.apache.org/jira/browse/YARN-3405
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.0
Reporter: Peng Zhang
Priority: Critical
Queue hierarchy described as below:
{noformat}
root
/
queue-1
/ \
queue-1-1 queue-1-2
{noformat}
1. When queue-1-1 is active and it has been assigned with all resources.
2. When queue-1-2 is active, and it cause some new preemption request.
3. But when do preemption, it now starts from root, and found queue-1 is not
over fairshare, so no recursion preemption to queue-1-1.
4. Finally queue-1-2 will be waiting for resource release form queue-1-1 itself.
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