Messaging API 429s during JMeter spike

General Discussion
1

Looking for advice on handling 429 errors when hitting /api/v2/communications/messages. Running JMeter from Singapore with 100 threads.

  1. Generate OAuth2 token.
  2. Send POST requests to create SMS conversations.
  3. Observe rate limiting after 50 concurrent calls.
2

It depends, but generally… rate limits on /api/v2/communications/messages are strict. For bulk operations, direct API calls often fail. Use the bulk export API instead. It handles throttling internally and preserves metadata for audit trails. Check the documentation for bulk job submission.

3

Bulk export is for analytics, not for creating real-time conversations. The suggestion above misses the point of transactional messaging.

Use the Genesys Cloud CLI for load testing. It handles 429 retries and token refresh automatically. JMeter does not understand Genesys rate limits.

  1. Install genesyscloud CLI via npm.
  2. Configure credentials in .env.
  3. Run spike test with built-in retry logic:
genesyscloud communications:messages:create \
 --to "+1234567890" \
 --text "Test message" \
 --retry-count 3 \
 --concurrency 100

This approach respects the API gateway throttling. It also provides clearer error logs than JMeter. If you must use JMeter, add a custom JSR223 PostProcessor to parse Retry-After headers and pause threads accordingly. But the CLI is simpler for this specific use case. The documentation confirms CLI is optimized for high-concurrency deployments.