Techniques

Building AI Operations with Retry Logic

Jay Banlasan

Jay Banlasan

The AI Systems Guy

tl;dr

Smart retries that handle transient failures without overwhelming the system. Retry logic done right.

This ai operations retry logic guide covers the difference between smart retries and dumb loops. Smart retries recover from transient failures. Dumb loops hammer a broken service and make everything worse.

The Basics

Not every failure should be retried. A 400 error (bad request) means your input is wrong. Retrying the same bad input will fail the same way forever. Fix the input.

A 429 error (rate limit) or 500 error (server issue) is transient. Retrying after a delay usually works. These are the failures retry logic is built for.

The distinction matters. Retrying permanent failures wastes time and money. Retrying transient failures saves both.

Exponential Backoff

Do not retry immediately. Each retry should wait longer than the last. First retry after 1 second. Second after 2 seconds. Third after 4 seconds. Fourth after 8.

This is exponential backoff and it works because transient failures usually resolve within seconds. If the service is overloaded, backing off gives it time to recover instead of adding to the load.

Add jitter: a small random variation to the delay. If 100 of your requests fail simultaneously and all retry at exactly the same intervals, they will all hit the server at the same time again. Jitter spreads them out.

Max Retries

Always set a maximum. Three retries is a good default. Five for critical operations. Never unlimited.

After max retries, fail gracefully. Log the error, alert someone, and move on. A task stuck in an infinite retry loop is worse than a task that failed and was reported.

Retry Budgets

For high-volume operations, set a retry budget instead of per-request limits. "Up to 10% of requests can retry" prevents a cascade where a service degradation causes every request to retry and triples your load.

If your retry rate exceeds the budget, something is fundamentally wrong. Stop retrying and alert immediately.

What to Do After Retry Exhaustion

Queue the failed task for manual review or delayed retry. Store enough context to understand what failed and why. Include the original input, the error responses, and the timestamps.

When the issue resolves, you can replay the failed items from the queue without re-running the entire workflow.

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