fix: 隔离 Pod 与 VM 并发容量

internal/taskscheduler/gate.go

@@ -1,31 +0,0 @@
-package taskscheduler
-
-import "context"
-
-// SingleFlightGate keeps at most one fetched task in flight. Release is
-// idempotent so repeated terminal updates cannot increase capacity.
-type SingleFlightGate struct {
-	token chan struct{}
-}
-
-func NewSingleFlightGate() *SingleFlightGate {
-	gate := &SingleFlightGate{token: make(chan struct{}, 1)}
-	gate.token <- struct{}{}
-	return gate
-}
-
-func (g *SingleFlightGate) Acquire(ctx context.Context) error {
-	select {
-	case <-g.token:
-		return nil
-	case <-ctx.Done():
-		return ctx.Err()
-	}
-}
-
-func (g *SingleFlightGate) Release() {
-	select {
-	case g.token <- struct{}{}:
-	default:
-	}
-}

internal/taskscheduler/gate_test.go

@@ -1,29 +0,0 @@
-package taskscheduler
-
-import (
-	"context"
-	"testing"
-	"time"
-)
-
-func TestSingleFlightGateBlocksUntilTerminalRelease(t *testing.T) {
-	gate := NewSingleFlightGate()
-	if err := gate.Acquire(context.Background()); err != nil {
-		t.Fatal(err)
-	}
-	blocked, cancel := context.WithTimeout(context.Background(), 20*time.Millisecond)
-	defer cancel()
-	if err := gate.Acquire(blocked); err == nil {
-		t.Fatal("second task acquired capacity before release")
-	}
-	gate.Release()
-	gate.Release()
-	if err := gate.Acquire(context.Background()); err != nil {
-		t.Fatal(err)
-	}
-	blockedAgain, cancelAgain := context.WithTimeout(context.Background(), 20*time.Millisecond)
-	defer cancelAgain()
-	if err := gate.Acquire(blockedAgain); err == nil {
-		t.Fatal("duplicate terminal release increased capacity")
-	}
-}

internal/taskscheduler/poller.go

@@ -26,7 +26,6 @@ type PollerConfig struct {
 type Poller struct {
 	Client    PollClient
 	Scheduler *Scheduler
-	Gate      *SingleFlightGate
 	Config    PollerConfig
 	OnError   func(error)
 }
@@ -51,14 +50,7 @@ func (p Poller) Run(ctx context.Context) error {
 		errorBackoff = 5 * time.Second
 	}
 	var tasksVersion int64
-	haveLease := false
 	for {
-		if p.Gate != nil && !haveLease {
-			if err := p.Gate.Acquire(ctx); err != nil {
-				return nil
-			}
-			haveLease = true
-		}
 		response, err := p.Client.FetchTask(ctx, tasksVersion)
 		if err != nil {
 			if ctx.Err() != nil {
@@ -80,10 +72,6 @@ func (p Poller) Run(ctx context.Context) error {
 		tasksVersion = response.GetTasksVersion()
 		task := response.GetTask()
 		if task == nil {
-			if p.Gate != nil {
-				p.Gate.Release()
-				haveLease = false
-			}
 			if !wait(ctx, emptyBackoff) {
 				return nil
 			}
@@ -91,7 +79,6 @@ func (p Poller) Run(ctx context.Context) error {
 		}
 		for {
 			if err := p.Scheduler.Run(ctx, task); err == nil {
-				haveLease = false
 				break
 			} else {
 				if ctx.Err() != nil {