Karthik Kambatla created YARN-3485:
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Summary: FairScheduler headroom calculation doesn't consider
maxResources for Fifo and FairShare policies
Key: YARN-3485
URL: https://issues.apache.org/jira/browse/YARN-3485
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 2.7.0
Reporter: Karthik Kambatla
Assignee: Karthik Kambatla
Priority: Critical
FairScheduler's headroom calculations consider the fairshare and
cluster-available-resources, and the fairshare has maxResources. However, for
Fifo and Fairshare policies, the fairshare is used only for memory and not cpu.
So, the scheduler ends up showing a higher headroom than is actually available.
This could lead to applications waiting for resources far longer than then
intend to. e.g. MAPREDUCE-6302.
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