wip: execute subscription updates in parallel

Author: endigma

v2/go.mod

@@ -32,7 +32,6 @@ require (
 	github.com/vektah/gqlparser/v2 v2.5.30
 	github.com/wundergraph/astjson v1.1.0
 	github.com/wundergraph/go-arena v1.1.0
-	go.uber.org/atomic v1.11.0
 	go.uber.org/goleak v1.3.0
 	golang.org/x/sync v0.17.0
 	golang.org/x/sys v0.37.0

v2/go.sum

@@ -162,8 +162,6 @@ go.opentelemetry.io/otel/sdk/metric v1.36.0/go.mod h1:qTNOhFDfKRwX0yXOqJYegL5WRa
 go.opentelemetry.io/otel/trace v1.36.0 h1:ahxWNuqZjpdiFAyrIoQ4GIiAIhxAunQR6MUoKrsNd4w=
 go.opentelemetry.io/otel/trace v1.36.0/go.mod h1:gQ+OnDZzrybY4k4seLzPAWNwVBBVlF2szhehOBB/tGA=
 go.uber.org/atomic v1.5.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
-go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=
-go.uber.org/atomic v1.11.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
 go.uber.org/multierr v1.3.0/go.mod h1:VgVr7evmIr6uPjLBxg28wmKNXyqE9akIJ5XnfpiKl+4=

v2/pkg/engine/resolve/resolve.go

@@ -1011,12 +1011,16 @@ func (r *Resolver) handleTriggerUpdate(id uint64, data []byte) {
 	}
 	trig.mu.Unlock()
 
+	var wg sync.WaitGroup
 	for _, pw := range pending {
 		if pw.sub.removed.Load() {
 			continue
 		}
-		r.executeSubscriptionUpdate(pw.sub.ctx, pw.sub, data)
+		wg.Go(func() {
+			r.executeSubscriptionUpdate(pw.sub.ctx, pw.sub, data)
+		})
 	}
+	wg.Wait()
 }
 
 // handleUpdateSubscription sends data to a single subscription using snapshot-and-release.