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https://issues.apache.org/jira/browse/YUNIKORN-3365?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dale Richardson updated YUNIKORN-3365:
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Priority: Minor (was: Major)
> Shutdown ordering: scheduler allocation notify can block on an RM reply the
> proxy never drains
> ----------------------------------------------------------------------------------------------
>
> Key: YUNIKORN-3365
> URL: https://issues.apache.org/jira/browse/YUNIKORN-3365
> Project: Apache YuniKorn
> Issue Type: Bug
> Components: core - scheduler
> Reporter: Dale Richardson
> Priority: Minor
> Labels: newbie
>
> {{ServiceContext.StopAll}} stops the scheduler before the RM proxy.
> {{Scheduler.handleAllocEvent}} can select a queued allocation event over the
> just-closed stop channel; the chain {{handleAllocEvent ->
> handleRMUpdateAllocationEvent -> processAllocations ->
> notifyRMNewAllocation}} then posts to the RM proxy and blocks on an
> unbuffered reply channel ({{context.go:803}}), but {{rmproxy.handleRMEvents}}
> returns on its own stop without draining {{pendingRMEvents}}, so the reply
> never arrives and the goroutine parks.
> Reproduced in ~43% of full {{pkg/scheduler/tests}} runs (6/14): {{go test
> -race -count=14 ./pkg/scheduler/tests/}}.
> Severity is limited under the current lifecycle. As noted on PR #1124,
> {{StopAll}} today runs as the process exits — the reply is moot and the
> queued events are dropped anyway — so the parked goroutine is harmless in
> normal operation. It matters only if (a) the parked goroutine blocks
> {{StopAll}} from completing cleanly, or (b) the scheduler is stopped without
> the process exiting, i.e. under in-process restart (YUNIKORN-3370).
> {{notifyRMAllocationReleased}} has the same unbuffered-reply shape.
> Proposed fix: drain or explicitly abandon in-flight replies on shutdown (or
> invert the stop order), then delete the {{notifyRMNewAllocation}} exemption
> in {{pkg/common/leakcheck/leakcheck.go}}.
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