CD
Cloudflare Developers•2mo ago
Ryan Chu

Extremely High Wall Time (900k ms) in Cloudflare Queues + Browser Rendering

While developing a Cloudflare Queues consumer worker integrated with Browser Rendering (@Cloudflare/puppeteer), we observe abnormally high wall time (~900,000 ms) despite normal CPU usage. The worker functions correctly but appears to hang due to potential asynchronous blocking. 
// consumer worker/index.ts
import puppeteer, { Browser } from '@cloudflare/puppeteer';
import { MessageBatch } from '@cloudflare/workers-types';

export interface Env {
  MYBROWSER: Fetcher;
}

export default {
  async queue(batch: MessageBatch<unknown>, env: Env): Promise<void> {
    let browser: Browser | null = null;
    try {
      browser = await puppeteer.launch(env.MYBROWSER);

      for (const message of batch.messages) {
        try {
          console.log('hello', message?.body);
          message.ack();
        } catch (error) {
          console.error('error', error);
          message.retry();
        }
      }
    } catch {
      batch.retryAll();
    }
    browser?.close();
  },
};
// consumer worker/index.ts
import puppeteer, { Browser } from '@cloudflare/puppeteer';
import { MessageBatch } from '@cloudflare/workers-types';

export interface Env {
  MYBROWSER: Fetcher;
}

export default {
  async queue(batch: MessageBatch<unknown>, env: Env): Promise<void> {
    let browser: Browser | null = null;
    try {
      browser = await puppeteer.launch(env.MYBROWSER);

      for (const message of batch.messages) {
        try {
          console.log('hello', message?.body);
          message.ack();
        } catch (error) {
          console.error('error', error);
          message.retry();
        }
      }
    } catch {
      batch.retryAll();
    }
    browser?.close();
  },
};
Observations: - Issue resembles cloudflare/puppeteer#93 with nearly identical symptoms - Problem occurs only when using browser rendering (puppeteer.launch(env.MYBROWSER)) - Message processing logic works as expected when isolated from browser operations Request for Guidance: Is this a known platform bug, or am I doing something wrong?
GitHub
[Bug]: Using the sessions API causes hanging queue · Issue #93 · cl...
Minimal, reproducible example import { WorkerEntrypoint } from "cloudflare:workers"; import puppeteer, { type Browser } from "@cloudflare/puppeteer"; export default class extend...
No description
0 Replies
No replies yetBe the first to reply to this messageJoin

Did you find this page helpful?