fix(worker): 固定异步准入候选避免执行槽空转

异步任务在调度器准入后，Worker 会再次按实时负载排序候选；排序变化会让已准入任务退回 waiting，同时继续占用 River 执行槽，导致高并发吞吐塌陷。执行前复用已持久化的 admitted 候选并稳定置顶，候选失效时仍保留原有重选路径；增加候选固定与非准入场景单测。验证：Go 全量测试、runner race、go vet、OpenAPI 生成一致性、迁移安全检查通过。
2026-07-31 07:06:06 +08:00
parent 3d9ae74b87
commit 238798e47c
3 changed files with 109 additions and 10 deletions
@@ -61,3 +61,57 @@ func TestAcceptanceAdmissionScopesLeaveProductionPolicyUnchanged(t *testing.T) {
 		t.Fatalf("production admission policy changed: %+v", got[0])
 	}
 }
+
+func TestPinCandidatesToTaskAdmissionPreservesAdmittedCandidate(t *testing.T) {
+	input := []store.RuntimeModelCandidate{
+		{PlatformID: "platform-a", PlatformModelID: "model-a"},
+		{PlatformID: "platform-b", PlatformModelID: "model-b"},
+		{PlatformID: "platform-c", PlatformModelID: "model-c"},
+	}
+	admission := &store.TaskAdmission{
+		Status:          "admitted",
+		PlatformID:      "platform-b",
+		PlatformModelID: "model-b",
+	}
+
+	got, pinned := pinCandidatesToTaskAdmission(input, admission)
+
+	if !pinned {
+		t.Fatal("expected admitted candidate to be pinned")
+	}
+	if got[0].PlatformModelID != "model-b" || got[1].PlatformModelID != "model-a" || got[2].PlatformModelID != "model-c" {
+		t.Fatalf("unexpected candidate order: %+v", got)
+	}
+	if input[0].PlatformModelID != "model-a" {
+		t.Fatalf("candidate pinning mutated the caller slice: %+v", input)
+	}
+}
+
+func TestPinCandidatesToTaskAdmissionIgnoresWaitingOrMissingCandidate(t *testing.T) {
+	input := []store.RuntimeModelCandidate{
+		{PlatformID: "platform-a", PlatformModelID: "model-a"},
+		{PlatformID: "platform-b", PlatformModelID: "model-b"},
+	}
+	for name, admission := range map[string]*store.TaskAdmission{
+		"waiting": {
+			Status:          "waiting",
+			PlatformID:      "platform-b",
+			PlatformModelID: "model-b",
+		},
+		"missing": {
+			Status:          "admitted",
+			PlatformID:      "platform-c",
+			PlatformModelID: "model-c",
+		},
+	} {
+		t.Run(name, func(t *testing.T) {
+			got, pinned := pinCandidatesToTaskAdmission(input, admission)
+			if pinned {
+				t.Fatalf("unexpected candidate pin for %s: %+v", name, got)
+			}
+			if got[0].PlatformModelID != "model-a" {
+				t.Fatalf("candidate order changed for %s: %+v", name, got)
+			}
+		})
+	}
+}