Yufei Gu created YARN-6793:
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Summary: Duplicated reservation in Fair Scheduler preemption
Key: YARN-6793
URL: https://issues.apache.org/jira/browse/YARN-6793
Project: Hadoop YARN
Issue Type: Bug
Components: fairscheduler
Affects Versions: 3.0.0-alpha3, 2.8.1
Reporter: Yufei Gu
Assignee: Yufei Gu
Priority: Critical
There is a delay between preemption happen and containers are killed. If some
resources released from nodes which are supposed to be preempted at that time
are not enough for the resource request, reservation happens again at that node.
E.g. scheduler reserve <memory 2048, vcore 2> in node 1 for app 1. It will take
15s by default to kill containers in node 1 for fulfill that resource requests.
If <memory 1024, vcore 1> released from node 1 before the killing, scheduler
reserve <memory 2048, vcore 2> for app1 again in node 1.
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