Create multiple process instances with batch

Camunda 7 Topics Discussion & Questions
1

What I want to implement is a function that receives a list of business keys (=strings) and generate a process instance of a known process definition for each of the keys. I try to do that with the following code:

private void startInstances(List<String> keys) {
    for (Object key : keys) {
        runtimeService.createProcessInstanceByKey("process1")
                 .businessKey(key)
                 .execute();
     }
}

This code works, but it isn’t very performant when I deal with larger lists in the range of 10.000 entries and above. It seems to take about 1 second for every 10 entries or 15 minutes for 10.000 entries. To improve performance I tried to execute it in parallel with the following variant:

private void startInstances(List<String> keys) {
    keys.parallelStream().forEach((key) -> {
        runtimeService.createProcessInstanceByKey("process1")
                .businessKey(key)
                .execute();
    });
}

This improved performance a lot, but I’m not 100% sure if this is a solid implementation (due to possible threading problems).

Also I have read about supported batch operations (see here ) but just the operation to create new process instances seems to be missing. Do you have any tips or alternative approaches?

Thanks in advance

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