Wangda Tan created YARN-3440:
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Summary: ResourceUsage should be copy-on-write
Key: YARN-3440
URL: https://issues.apache.org/jira/browse/YARN-3440
Project: Hadoop YARN
Issue Type: Bug
Components: resourcemanager, scheduler, yarn
Reporter: Wangda Tan
In {{org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceUsage
}}, even if it is thread-safe, but Resource returned by getters could be
updated by another thread.
All Resource objects in ResourceUsage should be copy-on-write, reader will
always get a non-changed Resource. And changes apply on Resource acquired by
caller will not affect original Resource.
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