Gatling "Empty results" issue due for we set group for request

[BrightSummer]

Hi,
We are try to use Taurus do gatling testing, and the yaml look like:

execution:
  - executor: gatling
    scenario: sample
scenarios:
  sample:
    script: build/libs/abc.jar
    simulation: test.TestSimulation

in TestSimilation we use 'io.gatling.javaapi.core.group', code look like:

scenario("ScenarioName")
                .exec(session -> session.setAll(Map.of("timeStamp", nlocalDateTime, "baseUrl", BASE_URL)))
                .group("abc")
                .on(exec(login.doLogin)
                        .exec(access.doAccess).pause(1000, 5000)
                );    

Then we found gatling works fine with result like:

================================================================================
2023-06-02 03:51:27                                           5s elapsed
---- Requests ------------------------------------------------------------------
> Global                                                   (OK=2      KO=0     )
> abc / Login... (OK=1      KO=0     )
> abc / Access... (OK=1      KO=0     )

---- Requisition Simulation ----------------------------------------------------
[--                                                                        ]  0%
          waiting: 60     / active: 1      / done: 0     
================================================================================

But Taurus get error:
ERROR: Child Process Error: Empty results, most likely sample (GatlingExecutor) failed. Actual reason for this can be found in logs under /tmp/artifacts
By looking the source code, we can see if we set ".group("abc")" in scenario, the 'req_hierarchy' in below will be always not none and '__parse_request' always return None, could we know if there any reason doesn't support 'req_hierarchy'?

      req_hierarchy = fields[0].split(',')[0]
       if req_hierarchy:
           if error:
               self._group_errors[req_hierarchy].add(error)
           return None

taurus/bzt/modules/gatling.py

Line 603 in 2ce9dbe

return None

[ckrams]

what is the version of taurus used; appears not latest and outdated per above source link

[pavel-silar-perforce]

As the group parameter changes the output format, our parser probably fails here. We don't plan to support it for older version of Gatling.

For Gatling 3.14.3 though (which we newly support), there is completely new reporting architecture and thus new parser. If this issue is prevalent there as well, we might address it. Keeping it open.