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🎯 Lesson Learned: RabbitMQ Default Timeouts

 👋 Hello Team!

Today I want to share an important lesson we discovered in production 


👉 Default timeouts matter! Especially when you’re working with RabbitMQ and long‑running consumers.

🕒 What’s the default timeout in RabbitMQ?

✅ By default, RabbitMQ expects a message acknowledgment from the consumer within 30 minutes.


✅ If no ACK is received in that window, RabbitMQ assumes:

“This consumer might have failed!”
…and re‑queues the message to another consumer.

⚡ Why did this become a problem for us?

Our consumers trigger shell scripts that sometimes run for 2–3 hours.
🛠️ In development, our test scripts were small (20–25 mins), so we never hit the 30‑minute limit.


🚀 But in production:

  • After 30 minutes, RabbitMQ re‑delivered the same message.

  • That led to multiple consumers processing the same job.

  • A single 1‑hour job started running 5 to 10 times in parallel! 😱

🔎 Root Cause Analysis (RCA)

✔️ RabbitMQ was working as designed—but our process simply exceeded its default timeout.

✅ The Fix

We updated the message acknowledgment timeout from 30 minutes → 24 hours.


✅ This aligns with our actual processing time.
✅ Now, each job runs exactly once—no more duplicate executions. 🎉

✨ Key Takeaway

💡 Always review and configure default timeouts when integrating systems—especially if you have long‑running consumers or processes.


A small setting can make a huge difference in production stability. 🚀


 

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