Karthik Kambatla created YARN-4526:
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Summary: Make SystemClock singleton so AppSchedulingInfo could use
it
Key: YARN-4526
URL: https://issues.apache.org/jira/browse/YARN-4526
Project: Hadoop YARN
Issue Type: Sub-task
Components: scheduler
Affects Versions: 2.8.0
Reporter: Karthik Kambatla
Assignee: Karthik Kambatla
To track the time a request is received, we need to get current system time.
For better testability of this, we are likely better off using a Clock instance
that uses SystemClock by default. Instead of creating umpteen instances of
SystemClock, we should just reuse the same instance.
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