JMeter won't write response data

Question

I'm running tests with JMeter (master+10 slaves) on elasticasearch. I'm getting error 400 for some requests but they are a bit elusive:

• When I run the requests manually with curl or pasting them on kibana's console, I don't get errors.
• Every time I run the tests using jmeter, using the same requests and under the same conditions, I get a different number of errors.

So I was thinking of inspecting the response bodies from jmeter. But all the ways I've tried failed:

• I've created a View Result Tree element and checked all boxes on the "configure" panel. When I run the script, it logs everything except response data
• I've tried a BeanShell post processor to write all responses on a file. But it apparently is being 'ignored' when I run the script

Both these solutions work on my machine, but not on the server (which I don't have total control over). I'm passing jmeter.save.saveservice.response_data=true on the command line to start jmeter.

What else could I try?

Answer 1

This is an optimization that JMeter makes for distributed testing related to the mode:

• https://jmeter.apache.org/usermanual/properties_reference.html#remote_batching_config

To avoid JMeter stripping the response data set in user.properties of servers snd controller:

mode=Batch

As by default it is:

mode=StrippedBatch