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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:
--------------------------------------
Labels: newbie (was: )
> Shutdown race: scheduler allocation notify blocks forever because the RM
> proxy stops without draining pending events
> --------------------------------------------------------------------------------------------------------------------
>
> 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: Major
> Labels: newbie
>
> Follow-up to YUNIKORN-3357 (PR #1124); burns down the leakcheck exemption
> scheduler.(*ClusterContext).notifyRMNewAllocation.
> {{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 is stuck permanently.
> Reproduced in ~43% of full {{pkg/scheduler/tests}} runs (6/14):
> {code}
> go test -race -count=14 ./pkg/scheduler/tests/
> {code}
> {{notifyRMAllocationReleased}} has the same unbuffered-reply shape and would
> leak under a different top frame; it has not been observed yet, so it is
> deliberately not exempted — but the fix should cover it too.
> Proposed fix: drain or explicitly abandon in-flight replies on shutdown (or
> invert the stop order), then delete the exemption in
> {{pkg/common/leakcheck/leakcheck.go}}. Argue both the deadlock and
> data-integrity directions preemptively (cf. the YUNIKORN-2629 ->
> YUNIKORN-2910 regression).
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