zhihai xu created YARN-3446:
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Summary: FairScheduler HeadRoom calculation should exclude nodes
in the blacklist.
Key: YARN-3446
URL: https://issues.apache.org/jira/browse/YARN-3446
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Reporter: zhihai xu
Assignee: zhihai xu
FairScheduler HeadRoom calculation should exclude nodes in the blacklist.
MRAppMaster does not preempt the reducers because for Reducer preemption
calculation, headRoom is considering blacklisted nodes. This makes jobs to hang
forever(ResourceManager does not assign any new containers on blacklisted nodes
but availableResource AM get from RM includes blacklisted nodes available
resource).
This issue is similar as YARN-1680 which is for Capacity Scheduler.
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