Exponential Backoff and Jitter for API Reads
Design bounded retry delays with jitter, classify retryable failures and avoid synchronised request bursts across blockchain data workers.
Overview
When translating these concepts into an integration, keep the scope described by the wallet history api with the result. The examples in wallet transaction history and smart contract event logs show how the same distinction affects neighbouring data questions.
Exponential backoff spaces repeated attempts farther apart. Jitter spreads callers across time. Neither replaces a clear decision about which failures are eligible for retry.
Classify before delaying
Temporary transport failures and selected service responses can be retry candidates for safe reads. Authentication errors, malformed requests and unsupported methods generally require correction rather than delay. Respect service-specific guidance and an overall retry budget. Do not retry state-changing operations without an appropriate idempotency contract.
Worked example: a bounded schedule
A read policy uses a base delay of one second and a cap of sixteen seconds, with randomised waits within a declared range. Five attempts are allowed within a total deadline. If the deadline is reached sooner, the client stops. The exact schedule is an operational choice, not a guarantee that the service will recover.
Make retries observable
Record attempt count, safe error class and elapsed time. Test repeated 503 responses, a permanent 400 error and cancellation while waiting. Share concurrency limits across retries and original requests. A retry loop that hides every failure can turn a short outage into an expensive backlog with no clear completion status.
A practical acceptance test
Feed a temporary service error followed by success, a permanent request error and repeated failures until the deadline. Assert eligible retries only, capped delays and a total attempt budget. Use a controllable random source for deterministic schedule tests. Cancellation should stop waiting without converting the operation into a valid empty dataset.
Questions about the topic
Frequently asked questions
Should authentication failures use backoff indefinitely?
No. Correct the credential or authorisation issue.
Why add jitter?
It reduces synchronised retries from many clients after the same disruption.
Standards & technical documentation