[jira] [Created] (NIFI-7501) Generate Flowfile does not scale

["Dennis Jaheruddin (Jira)" <ji...@apache.org>]

Dennis Jaheruddin created NIFI-7501:
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             Summary: Generate Flowfile does not scale
                 Key: NIFI-7501
                 URL: https://issues.apache.org/jira/browse/NIFI-7501
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Extensions
    Affects Versions: 1.11.4
            Reporter: Dennis Jaheruddin
         Attachments: generationperformance.xml

One of the purposes of Generate Flowfile is load testing. However, unfortunately it often appears to become the bottleneck itself. I have found it not to scale well.

Example result from my laptop:

I want to generate messages and bring them to a single processor, lets call it processor X.

With 1 concurrent task, and a batch size of 1, and a message size of 10MB and uniqueness false it can generate approximately 2 GB/sec.

When allowing for more concurrent tasks, or a larger batch size, no noticeable change is found.

However, if instead of increasing the batchsize I route the success relationship to multiple processors that do 'nothing' (like updateattribute), and then bring the success relations of all these to processor X, I can get much more than 2 GB/sec. 

 

In conclusion: I don't appear to be hitting a hardware limit as I am able to generate the number of messages in this inelegant way, but no matter how I set up my generateflowfile processor, it just will not scale. Suggesting there may be a smarter way to generate data when uniqueness is not required.

 

I have attached a template to illustrate my findings.



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