v4: fix batchTriggerAndWait completion issues by processing batch chunks sequentially

apps/webapp/app/runEngine/services/batchTrigger.server.ts

@@ -58,7 +58,10 @@ export class RunEngineBatchTriggerService extends WithRunEngine {
   ) {
     super({ prisma });
 
-    this._batchProcessingStrategy = batchProcessingStrategy ?? "parallel";
+    // Eric note: We need to force sequential processing because when doing parallel, we end up with high-contention on the parent run lock
+    // becuase we are triggering a lot of runs at once, and each one is trying to lock the parent run.
+    // by forcing sequential, we are only ever locking the parent run for a single run at a time.
+    this._batchProcessingStrategy = "sequential";
   }
 
   public async call(
@@ -316,6 +319,14 @@ export class RunEngineBatchTriggerService extends WithRunEngine {
     }
   }
 
+  async #enqueueBatchTaskRun(options: BatchProcessingOptions, tx?: PrismaClientOrTransaction) {
+    await workerQueue.enqueue("runengine.processBatchTaskRun", options, {
+      tx,
+      jobKey: `RunEngineBatchTriggerService.process:${options.batchId}:${options.processingId}`,
+    });
+  }
+
+  // This is the function that the worker will call
   async processBatchTaskRun(options: BatchProcessingOptions) {
     logger.debug("[RunEngineBatchTrigger][processBatchTaskRun] Processing batch", {
       options,
@@ -648,13 +659,6 @@ export class RunEngineBatchTriggerService extends WithRunEngine {
       : undefined;
   }
 
-  async #enqueueBatchTaskRun(options: BatchProcessingOptions, tx?: PrismaClientOrTransaction) {
-    await workerQueue.enqueue("runengine.processBatchTaskRun", options, {
-      tx,
-      jobKey: `RunEngineBatchTriggerService.process:${options.batchId}:${options.processingId}`,
-    });
-  }
-
   async #handlePayloadPacket(
     payload: any,
     pathPrefix: string,

internal-packages/run-engine/src/engine/tests/releaseConcurrencyTokenBucketQueue.test.ts

@@ -680,40 +680,6 @@ describe("ReleaseConcurrencyQueue", () => {
     }
   });
 
-  redisTest(
-    "Should retrieve metrics for all queues via getQueueMetrics",
-    async ({ redisContainer }) => {
-      const { queue } = createReleaseConcurrencyQueue(redisContainer, 1);
-
-      // Set up multiple queues with different states
-      await queue.attemptToRelease({ name: "metrics-queue1" }, "run1"); // Consume 1 token from queue1
-
-      // Add more items to queue1 that will be queued due to no tokens
-      await queue.attemptToRelease({ name: "metrics-queue1" }, "run2"); // This will be queued
-      await queue.attemptToRelease({ name: "metrics-queue1" }, "run3"); // This will be queued
-      await queue.attemptToRelease({ name: "metrics-queue1" }, "run4"); // This will be queued
-
-      const metrics = await queue.getQueueMetrics();
-
-      expect(metrics).toHaveLength(1);
-      expect(metrics[0].releaseQueue).toBe("metrics-queue1");
-      expect(metrics[0].currentTokens).toBe(0);
-      expect(metrics[0].queueLength).toBe(3);
-
-      // Now add 10 items to 100 different queues
-      for (let i = 0; i < 100; i++) {
-        for (let j = 0; j < 10; j++) {
-          await queue.attemptToRelease({ name: `metrics-queue2-${i}` }, `run${i}-${j}`);
-        }
-      }
-
-      const metrics2 = await queue.getQueueMetrics();
-      expect(metrics2.length).toBeGreaterThan(90);
-
-      await queue.quit();
-    }
-  );
-
   redisTest(
     "refillTokenIfInReleasings should refill token when releaserId is in the releasings set",
     async ({ redisContainer }) => {

references/hello-world/src/trigger/batches.ts

@@ -0,0 +1,39 @@
+import { task } from "@trigger.dev/sdk/v3";
+import { setTimeout } from "timers/promises";
+
+export const batchTriggerAndWait = task({
+  id: "batch-trigger-and-wait",
+  maxDuration: 60,
+  run: async (payload: { count: number }, { ctx }) => {
+    const payloads = Array.from({ length: payload.count }, (_, i) => ({
+      payload: { waitSeconds: 1, output: `test${i}` },
+    }));
+
+    // First batch triggerAndWait with idempotency keys
+    const firstResults = await fixedLengthTask.batchTriggerAndWait(payloads);
+  },
+});
+
+type Payload = {
+  waitSeconds: number;
+  error?: string;
+  output?: any;
+};
+
+export const fixedLengthTask = task({
+  id: "fixed-length-lask",
+  retry: {
+    maxAttempts: 2,
+    maxTimeoutInMs: 100,
+  },
+  machine: "micro",
+  run: async ({ waitSeconds = 1, error, output }: Payload) => {
+    await setTimeout(waitSeconds * 1000);
+
+    if (error) {
+      throw new Error(error);
+    }
+
+    return output;
+  },
+});