how to perform Jmeter API performance test with multiple backend systems?

Question

I want to do POST API performance test with Jmeter for the end to end system. Backend architecture is as follows,

API <-> [A system] <-API-> [B system]

The problem is when I am setting up Jmeter POST API it just generates 200 ok status for [A system] and does not care if the request is failed in further system. But I want to test the performance of the complete system and would like to know the RESPONSE OK or NG from [B system] for the POST API called from [A system]. Is there any solution to this concern? If more details are required about the problem let me know...

Answer 1

JMeter knows nothing about downstream components which are deployed behind system A therefore you cannot test the whole sequence.

The options are in:

1. If system B can be queries somehow for the status of a particular request you could use While Controller to periodically check whether system B has processed the request and record the cumulative time using Transaction Controller

2. The whole integrated system always acts at the speed of its slowest component so you can conduct 2 tests:

   • JMeter to mimic system A usage by system A consumer(s)
   • JMeter to mimic system B usage by system A

   once you have the results you can compare the throughput and state which one is slower

3. It might be the case you can collect the statuses from the system B using JMeter PerfMon Plugin or SSHMon Listener

4. You can consider using Grafana to collect metrics from systems A and B so you will have aggregate dashboard with the results.