Resilient Async Streams with Exponential Backoff

Snippet

Resilient Async Streams with Exponential Backoff

When handling flaky network requests, a simple retry is often insufficient. Exponential backoff reduces server strain by increasing the delay between attempts mathematically, ensuring a more stable recovery mechanism.

snippet.js
javascript
import { timer, retry } from 'rxjs';
 
this.http.get('/api/data').pipe(
  retry({
    count: 3,
    delay: (error, retryCount) => {
      const backoffTime = Math.pow(2, retryCount) * 1000;
      console.warn(`Retry #${retryCount} in ${backoffTime}ms`);
      return timer(backoffTime);
    }
  })
).subscribe();

angular

Breakdown

delay: (error, retryCount) => ...

A dynamic delay function that receives the error and the current attempt index.

Math.pow(2, retryCount) * 1000

Calculates the wait time exponentially (1s, 2s, 4s, etc.) to prevent thundering herd problems.

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Resilient Async Streams with Exponential Backoff

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