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Default retry strategy uses exponential backoff and jitter #1854

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Default retry strategy uses exponential backoff and jitter #1854

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9 changes: 6 additions & 3 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -761,9 +761,12 @@ using the `retryStrategy` option:
```javascript
const redis = new Redis({
// This is the default value of `retryStrategy`
retryStrategy(times) {
const delay = Math.min(times * 50, 2000);
return delay;
retryStrategy: function (times) {
// Generate a random jitter between 0 – 200 ms:
const jitter = Math.floor(Math.random() * 200);
// Delay is an exponential back off, (times^2) * 50 ms, with a maximum value of 2000 ms:
const delay = Math.min(Math.pow(2, times) * 50, 2000);
return delay + jitter;
},
});
```
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6 changes: 5 additions & 1 deletion lib/redis/RedisOptions.ts
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Expand Up @@ -193,7 +193,11 @@ export const DEFAULT_REDIS_OPTIONS: RedisOptions = {
connectTimeout: 10000,
disconnectTimeout: 2000,
retryStrategy: function (times) {
return Math.min(times * 50, 2000);
// Generate a random jitter between 0 – 200 ms:
const jitter = Math.floor(Math.random() * 200);
// Delay is an exponential back off, (times^2) * 50 ms, with a maximum value of 2000 ms:
const delay = Math.min(Math.pow(2, times) * 50, 2000);
return delay + jitter;
},
keepAlive: 0,
noDelay: true,
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