[apache#32211] Fail job on SDK worker disconnect.

sdks/go/pkg/beam/runners/prism/internal/worker/bundle.go

@@ -126,14 +126,26 @@ func (b *B) ProcessOn(ctx context.Context, wk *W) <-chan struct{} {
 	slog.Debug("processing", "bundle", b, "worker", wk)
 
 	// Tell the SDK to start processing the bundle.
-	wk.InstReqs <- &fnpb.InstructionRequest{
+	req := &fnpb.InstructionRequest{
 		InstructionId: b.InstID,
 		Request: &fnpb.InstructionRequest_ProcessBundle{
 			ProcessBundle: &fnpb.ProcessBundleRequest{
 				ProcessBundleDescriptorId: b.PBDID,
 			},
 		},
 	}
+	select {
+	case <-wk.StoppedChan:
+		// The worker was stopped before req was sent.
+		// Quit to avoid sending on a closed channel.
+		outCap := b.OutputCount + len(b.HasTimers)
+		for i := 0; i < outCap; i++ {
+			b.DataOrTimerDone()
+		}
+		return b.DataWait
+	case wk.InstReqs <- req:
+		// desired outcome
+	}
 
 	// TODO: make batching decisions on the maxium to send per elements block, to reduce processing time overhead.
 	for _, block := range b.Input {
@@ -163,10 +175,13 @@ func (b *B) ProcessOn(ctx context.Context, wk *W) <-chan struct{} {
 		}
 
 		select {
-		case wk.DataReqs <- elms:
+		case <-wk.StoppedChan:
+			b.DataOrTimerDone()
+			return b.DataWait
 		case <-ctx.Done():
 			b.DataOrTimerDone()
 			return b.DataWait
+		case wk.DataReqs <- elms:
 		}
 	}
 
@@ -181,6 +196,12 @@ func (b *B) ProcessOn(ctx context.Context, wk *W) <-chan struct{} {
 		})
 	}
 	select {
+	case <-wk.StoppedChan:
+		b.DataOrTimerDone()
+		return b.DataWait
+	case <-ctx.Done():
+		b.DataOrTimerDone()
+		return b.DataWait
 	case wk.DataReqs <- &fnpb.Elements{
 		Timers: timers,
 		Data: []*fnpb.Elements_Data{
@@ -191,9 +212,6 @@ func (b *B) ProcessOn(ctx context.Context, wk *W) <-chan struct{} {
 			},
 		},
 	}:
-	case <-ctx.Done():
-		b.DataOrTimerDone()
-		return b.DataWait
 	}
 
 	return b.DataWait

sdks/go/pkg/beam/runners/prism/internal/worker/worker.go

@@ -68,6 +68,7 @@ type W struct {
 	// These are the ID sources
 	inst               uint64
 	connected, stopped atomic.Bool
+	StoppedChan        chan struct{} // Channel to Broadcast stopped state.
 
 	InstReqs chan *fnpb.InstructionRequest
 	DataReqs chan *fnpb.Elements
@@ -96,8 +97,9 @@ func New(id, env string) *W {
 		lis:    lis,
 		server: grpc.NewServer(opts...),
 
-		InstReqs: make(chan *fnpb.InstructionRequest, 10),
-		DataReqs: make(chan *fnpb.Elements, 10),
+		InstReqs:    make(chan *fnpb.InstructionRequest, 10),
+		DataReqs:    make(chan *fnpb.Elements, 10),
+		StoppedChan: make(chan struct{}),
 
 		activeInstructions: make(map[string]controlResponder),
 		Descriptors:        make(map[string]*fnpb.ProcessBundleDescriptor),
@@ -132,12 +134,26 @@ func (wk *W) LogValue() slog.Value {
 	)
 }
 
+// shutdown safely closes channels, and can be called in the event of SDK crashes.
+//
+// Splitting this logic from the GRPC server Stop is necessary, since a worker
+// crash would be handled in a streaming RPC context, which will block GRPC
+// stop calls.
+func (wk *W) shutdown() {
+	// If this is the first call to "stop" this worker, also close the channels.
+	if wk.stopped.CompareAndSwap(false, true) {
+		slog.Debug("shutdown", "worker", wk, "firstTime", true)
+		close(wk.StoppedChan)
+		close(wk.InstReqs)
+		close(wk.DataReqs)
+	} else {
+		slog.Debug("shutdown", "worker", wk, "firstTime", false)
+	}
+}
+
 // Stop the GRPC server.
 func (wk *W) Stop() {
-	slog.Debug("stopping", "worker", wk)
-	wk.stopped.Store(true)
-	close(wk.InstReqs)
-	close(wk.DataReqs)
+	wk.shutdown()
 
 	// Give the SDK side 5 seconds to gracefully stop, before
 	// hard stopping all RPCs.
@@ -331,17 +347,21 @@ func (wk *W) Control(ctrl fnpb.BeamFnControl_ControlServer) error {
 		case <-ctrl.Context().Done():
 			wk.mu.Lock()
 			// Fail extant instructions
-			slog.Debug("SDK Disconnected", "worker", wk, "ctx_error", ctrl.Context().Err(), "outstanding_instructions", len(wk.activeInstructions))
+			err := context.Cause(ctrl.Context())
+			slog.Debug("SDK Disconnected", "worker", wk, "ctx_error", err, "outstanding_instructions", len(wk.activeInstructions))
 
-			msg := fmt.Sprintf("SDK worker disconnected: %v, %v active instructions", wk.String(), len(wk.activeInstructions))
+			msg := fmt.Sprintf("SDK worker disconnected: %v, %v active instructions, error: %v", wk.String(), len(wk.activeInstructions), err)
 			for instID, b := range wk.activeInstructions {
 				b.Respond(&fnpb.InstructionResponse{
 					InstructionId: instID,
 					Error:         msg,
 				})
 			}
+			// Soft shutdown to prevent GRPC shutdown from being blocked by this
+			// streaming call.
+			wk.shutdown()
 			wk.mu.Unlock()
-			return context.Cause(ctrl.Context())
+			return err
 		case err := <-done:
 			if err != nil {
 				slog.Warn("Control done", "error", err, "worker", wk)
@@ -639,9 +659,22 @@ func (wk *W) sendInstruction(ctx context.Context, req *fnpb.InstructionRequest)
 	if wk.Stopped() {
 		return nil
 	}
-	wk.InstReqs <- req
+	select {
+	case <-wk.StoppedChan:
+		return &fnpb.InstructionResponse{
+			InstructionId: progInst,
+			Error:         "worker stopped before send",
+		}
+	case wk.InstReqs <- req:
+		// desired outcome
+	}
 
 	select {
+	case <-wk.StoppedChan:
+		return &fnpb.InstructionResponse{
+			InstructionId: progInst,
+			Error:         "worker stopped before receive",
+		}
 	case <-ctx.Done():
 		return &fnpb.InstructionResponse{
 			InstructionId: progInst,