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Merge pull request #110096 from tkashem/graceful-new-signal

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apiserver: add lifecycle signal for preshutdown hook
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Kubernetes Prow Robot 2022-05-18 00:53:06 -07:00 committed by GitHub
commit b1aa1bd308
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2 changed files with 13 additions and 4 deletions
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12
staging/src/k8s.io/apiserver/pkg/server/genericapiserver.go
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@ -437,7 +437,7 @@ func (s *GenericAPIServer) PrepareRun() preparedGenericAPIServer {
// | |
// (ShutdownDelayDuration) (PreShutdownHooks)
// | |
// AfterShutdownDelayDuration (delayedStopCh) preShutdownHooksHasStoppedCh
// AfterShutdownDelayDuration (delayedStopCh) PreShutdownHooksStopped (preShutdownHooksHasStoppedCh)
// | |
// |---------------------------------- |
// | | |
@ -510,12 +510,13 @@ func (s preparedGenericAPIServer) Run(stopCh <-chan struct{}) error {
}
// pre-shutdown hooks need to finish before we stop the http server
preShutdownHooksHasStoppedCh, stopHttpServerCh := make(chan struct{}), make(chan struct{})
preShutdownHooksHasStoppedCh := s.lifecycleSignals.PreShutdownHooksStopped
stopHttpServerCh := make(chan struct{})
go func() {
defer close(stopHttpServerCh)
<-delayedStopOrDrainedCh
<-preShutdownHooksHasStoppedCh
<-preShutdownHooksHasStoppedCh.Signaled()
}()
// Start the audit backend before any request comes in. This means we must call Backend.Run
@ -556,7 +557,10 @@ func (s preparedGenericAPIServer) Run(stopCh <-chan struct{}) error {
// run shutdown hooks directly. This includes deregistering from
// the kubernetes endpoint in case of kube-apiserver.
func() {
defer close(preShutdownHooksHasStoppedCh)
defer func() {
preShutdownHooksHasStoppedCh.Signal()
klog.V(1).InfoS("[graceful-termination] pre-shutdown hooks completed", "name", preShutdownHooksHasStoppedCh.Name())
}()
err = s.RunPreShutdownHooks()
}()
if err != nil {

5
staging/src/k8s.io/apiserver/pkg/server/lifecycle_signals.go
View File

@ -120,6 +120,10 @@ type lifecycleSignals struct {
// ShutdownDelayDuration allows the apiserver to delay shutdown for some time.
AfterShutdownDelayDuration lifecycleSignal
// PreShutdownHooksStopped event is signaled when all registered
// preshutdown hook(s) have finished running.
PreShutdownHooksStopped lifecycleSignal
// InFlightRequestsDrained event is signaled when the existing requests
// in flight have completed. This is used as signal to shut down the audit backends
InFlightRequestsDrained lifecycleSignal
@ -143,6 +147,7 @@ func newLifecycleSignals() lifecycleSignals {
return lifecycleSignals{
ShutdownInitiated: newNamedChannelWrapper("ShutdownInitiated"),
AfterShutdownDelayDuration: newNamedChannelWrapper("AfterShutdownDelayDuration"),
PreShutdownHooksStopped: newNamedChannelWrapper("PreShutdownHooksStopped"),
InFlightRequestsDrained: newNamedChannelWrapper("InFlightRequestsDrained"),
HTTPServerStoppedListening: newNamedChannelWrapper("HTTPServerStoppedListening"),
HasBeenReady: newNamedChannelWrapper("HasBeenReady"),