Predictive Routing Queue Overflow with 10k Concurrent WebSocket Connections

Genesys Cloud Routing
1

Has anyone figured out why the predictive routing API returns 429 errors when JMeter hits 10,000 concurrent WebSocket connections from Singapore? The queue depth in Architect shows zero, but the platform_api rejects half the call attempts immediately. My JMeter config uses a ramp-up of 1 second per thread and targets the v2/analytic/conversations endpoint for validation.

2

This happens because the regional rate limiters for the Singapore edge, not queue depth.

  1. Implement exponential backoff in your JMeter script to respect the Retry-After header.
  2. Increase the initial delay between thread starts to avoid hitting the 10k concurrent connection cap.
3

Make sure you align your load testing with the actual business capacity limits defined in the Architect flows. The 429 errors indicate the platform is protecting itself from exceeding configured thresholds, not just regional rate limits.

{
 "max_concurrent_interactions": 5000,
 "overflow_behavior": "queue"
}