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Merge pull request #110081 from wojtek-t/document_shutdown_sequence
Diagram for graceful shutdown
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commit
c79b909de7
@ -421,6 +421,33 @@ func (s *GenericAPIServer) PrepareRun() preparedGenericAPIServer {
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// Run spawns the secure http server. It only returns if stopCh is closed
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// Run spawns the secure http server. It only returns if stopCh is closed
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// or the secure port cannot be listened on initially.
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// or the secure port cannot be listened on initially.
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// This is the diagram of what channels/signals are dependent on each other:
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//
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// stopCh
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// |
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// ---------------------------------------------------------
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// | |
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// ShutdownInitiated (shutdownInitiatedCh) |
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// | |
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// (ShutdownDelayDuration) (PreShutdownHooks)
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// | |
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// AfterShutdownDelayDuration (delayedStopCh) preShutdownHooksHasStoppedCh
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// | |
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// |---------------------------------- |
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// | | |
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// | (HandlerChainWaitGroup::Wait) |
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// | | |
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// | InFlightRequestsDrained (drainedCh) |
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// | | |
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// [without ShutdownSendRetryAfter] [with ShutdownSendRetryAfter] |
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// | | |
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// ---------------------------------------------------------
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// |
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// stopHttpServerCh
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// |
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// listenerStoppedCh
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// |
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// HTTPServerStoppedListening (httpServerStoppedListeningCh)
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func (s preparedGenericAPIServer) Run(stopCh <-chan struct{}) error {
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func (s preparedGenericAPIServer) Run(stopCh <-chan struct{}) error {
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delayedStopCh := s.lifecycleSignals.AfterShutdownDelayDuration
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delayedStopCh := s.lifecycleSignals.AfterShutdownDelayDuration
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shutdownInitiatedCh := s.lifecycleSignals.ShutdownInitiated
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shutdownInitiatedCh := s.lifecycleSignals.ShutdownInitiated
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