Camunda 7 Start Process Instance high latency

Camunda 7 Topics
1

We encounter a some slowness that we’re tracking down. Just want to leave it here to see if anyone has done the same, and I’d like to learn from you

We execute a process definition this way

return runtimeService
          .createProcessInstanceById(procDefID)
          .businessKey(businessKey)
          .setVariables(variables)
          .execute()
          .getBusinessKey();

When enable TRACE level for Camunda engine we see this

- Nov 14, 2024 14:30:02.998
- ENGINE-03009 SQL operation: 'INSERT'; Entity: 'HistoricVariableUpdateEventEntity[id=fdb3c593-a2d7-11ef-9371-7ad4f1c50975]'
- Nov 14, 2024 14:30:02.998
- ENGINE-03009 SQL operation: 'INSERT'; Entity: 'ByteArrayEntity[id=fdb3c594-a2d7-11ef-9371-7ad4f1c50975]'
- Nov 14, 2024 14:30:02.998
- ENGINE-03009 SQL operation: 'INSERT'; Entity: 'ByteArrayEntity[id=fdb3c596-a2d7-11ef-9371-7ad4f1c50975]'
- Nov 14, 2024 14:30:02.999
- ENGINE-03009 SQL operation: 'INSERT'; Entity: 'VariableInstanceEntity[id=fdb39e80-a2d7-11ef-9371-7ad4f1c50975]'
- Nov 14, 2024 14:30:02.999
- ENGINE-03009 SQL operation: 'INSERT'; Entity: 'VariableInstanceEntity[id=fdb39e82-a2d7-11ef-9371-7ad4f1c50975]'
- Nov 14, 2024 14:30:02.999
- ENGINE-03009 SQL operation: 'INSERT'; Entity: 'VariableInstanceEntity[id=fdb3c595-a2d7-11ef-9371-7ad4f1c50975]'
- Nov 14, 2024 14:30:02.999
- ENGINE-03009 SQL operation: 'INSERT'; Entity: 'VariableInstanceEntity[id=fdb3c599-a2d7-11ef-9371-7ad4f1c50975]'
- Nov 14, 2024 14:30:02.999
- ENGINE-03009 SQL operation: 'INSERT'; Entity: 'MessageEntity[id=fdb54c3b-a2d7-11ef-9371-7ad4f1c50975]'
- Nov 14, 2024 14:30:05.631
  ENGINE-13006 Finishing command -------------------- StartProcessInstanceCmd

it looks like it takes ~3 secs for the process instance cmd to start.

We also notice that if i keep triggering this operation, then the latency is eventually reduced; but as we leave it alone for a while it’ll be slow again. It looks like it’s some sort of batching execution like the Job Executor. But I believe that StartProcessInstanceCmd call is synchronous, so I am not sure. Hope someone can shed some light on this and suggest what I can try

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