Controls order of execution in a queue?

[Huagen peng]

Hi,

I notice that the order of execution in an incoming queue is not FIFO (first in 
first out).  For example, I have a ExecuteStreamCommand processor, which at one 
point may have more than 20 flowflies waiting.  It appears that the processor 
just randomly select a flowfile from the queue after it finishes one.  This 
leaves some flowfile waiting in the queue for a wrong time. I would like the 
processor to run the flowfiles FIFO.  Is there anyway to specify the order of 
execution?

Thanks,

Huagen