[jira] [Created] (YUNIKORN-2233) Lot of core objects instances cannot be stopped

["Peter Bacsko (Jira)" <ji...@apache.org>]

Peter Bacsko created YUNIKORN-2233:
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             Summary: Lot of core objects instances cannot be stopped
                 Key: YUNIKORN-2233
                 URL: https://issues.apache.org/jira/browse/YUNIKORN-2233
             Project: Apache YuniKorn
          Issue Type: Improvement
          Components: core - scheduler
            Reporter: Peter Bacsko
            Assignee: Peter Bacsko


Once we have a {{Scheduler}}, {{RMProxy}}, {{HealthChecker}}, {{internalMetricsCollector}}, etc. objects initialized, there's no way to stop the background goroutines started by them. This isn't necessarily a problem in a real environment, because restarting the scheduler core on its own is not a requirement. 

However, in the tests which use {{MockScheduler}}, we don't want goroutines to keep running and consume memory. Therefore, we a need a proper {{Stop()}} method on the most relevant types to make sure that the stop signal propagates to all goroutines.

Attached screenshot shows what happens after we call {{MockScheduler.Stop()}} in the core (it's very similar to the {{MockScheduler}} in the shim). Goroutines are still running from the following types:
* {{Scheduler}}
* {{nodesResourceUsageMonitor}}
* {{HealthChecker}}
* {{RMProxy}}
* {{EventSystemImpl}}
* {{partitionManager}}
* {{internalMetricsCollector}}




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