Thank you Mike.  I created a ticket to add documentation for this to the 
processor:

https://issues.apache.org/jira/browse/NIFI-13597

> On Jul 29, 2024, at 12:45 PM, Michael Moser <[email protected]> wrote:
> 
> Hello Greg.  If you give ConsumeJMS > 1 concurrent task, each task will 
> create a separate consumer.
> 
> If you are consuming from a JMS Queue, then you are OK and will not duplicate 
> any messages.
> 
> If, however, you are consuming from a JMS Topic, then you should keep 
> ConsumeJMS at 1 concurrent task.  Using > 1 concurrent task would cause each 
> task to receive every message from the Topic.
> 
> -- Mike
> 
> 
> On Thu, Jul 25, 2024 at 11:41 AM Gregory Foreman 
> <[email protected] <mailto:[email protected]>> 
> wrote:
>> Hello:
>> 
>> My client is running Nifi 1.22.0, single node.  The ConsumeJMS processor is 
>> at the top of the dataflow.  If more than one concurrent task is running, is 
>> there a potential for duplicate flowfiles to be generated?
>> 
>> Thanks,
>> Greg

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