jmeter: Avoid duplicate execution in ForEach Controller

Question

I have a folder with many JSON-Files and I would like to send them parallel to a Webservice using jmeter.

I already used a BeanShell Sampler to collect the files into jmeter-variables. Then I used a ForEach Controller to perform the HTTP Request (see this thread).

But the problem is, when using a thread count > 1, the json-files are processed multiple times. Each thread loops through the list of JSON-files for its own.

Do you know how multiple threads can share the output variable of a ForEach Controller?

See jmeter configuration

. There are 3 (threads) * 2 (files) = 6 debug outputs. But I would like that e.g. thread 1 processes first.json, thread 3 processes second.json and thread 2 does not have any left. So no file is processed multiple times.

Answer 1

The easiest way of implementing your requirement is using Directory Listing Config plugin.

The plugin reads all the files from the folder provided into a single JMeter variable:

As you can see in the above setup 3rd user doesn't execute the sampler as the folder contains only 2 files and both have been processed already:

You can install Directory Listing Config plugin using JMeter Plugins Manager