[I] Jmeter is causing 4x latency for high volume of 429s due to backend microservice rate limiting compared to latency for 200 OK response [jmeter]

["mkaranth-tech (via GitHub)" <gi...@apache.org>]

mkaranth-tech opened a new issue, #6570:
URL: https://github.com/apache/jmeter/issues/6570

   ### Expected behavior
   
   Expected behaviour should be equal or less latency than 200 OK response.
   
   ### Actual behavior
   
   We are trying to simulate 3 million requests/min from jmeter to background service. When we don't have rate limiting, jmeter instances are able to generate 3 million request per min. But when we enable rate limiting, throughout is reduced by 1/4th of what we are using for all success (200 OK) responses. When we checked the latency at background service/ingress, latency seems to be fine. But jmeter reports 4 times higher response time. Is there any limitation of 429s on jmeter load generation? Why 429s are reducing throughput at jmeter and increasing the latency at Jmeter?
   
   ### Steps to reproduce the problem
   
   1. Simulate very volume of test with all sucess response from a service
   2. Now repeat the test with enabling rate limiting for that service and configure rate limit to reject 50% of the requests.
   3. Now you should be able to see latency of 429s are 4x slower than 200 OK responses.
   
   ### JMeter Version
   
   latest
   
   ### Java Version
   
   latest
   
   ### OS Version
   
   Macos


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Re: [I] Jmeter is causing 4x latency for high volume of 429s due to backend microservice rate limiting compared to latency for 200 OK response [jmeter]

["vlsi (via GitHub)" <gi...@apache.org>]

vlsi commented on issue #6570:
URL: https://github.com/apache/jmeter/issues/6570#issuecomment-3482053542

   I don't think JMeter has 429 handling, however, it looks it might be a reasonable feature to add: retry certain HTTP codes, and support `Retry-After` header.


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