Jonathan Hung created YARN-9222:
-----------------------------------
Summary: Change startTime semantics for RMApp
Key: YARN-9222
URL: https://issues.apache.org/jira/browse/YARN-9222
Project: Hadoop YARN
Issue Type: Bug
Reporter: Jonathan Hung
Currently submitTime for rmApp is based on when app is submitted to
RMAppManager:
{noformat}
rmAppManager.submitApplication(submissionContext,
System.currentTimeMillis(), user);{noformat}
Then RMAppManager#createAndPopulateNewRMApp does some validation (queue
routing, app priority, etc), then the RMAppImpl object is created, at which
point the startTime is populated:
{noformat}
if (startTime <= 0) {
this.startTime = this.systemClock.getTime();
} else {
this.startTime = startTime;
}{noformat}
In general it seems there shouldn't be much difference between submitTime and
startTime. It makes more sense to change startTime to when the app actually
started. One possible solution is to (re)populate startTime when application
master registers with RM.
One issue may be compatibility, especially if there are large scheduling delays.
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