This behavior is known and there is an open JIRA ticket [1] for it. It's not great for the processor's onTrigger() to be continually called without a flowfile, but it's also not a great user experience to do nothing and show 0 tasks executed, which leaves the end user with no idea why the processor isn't working. The current behavior is likely the best choice of the two, until some good UI notification can be built as mentioned in the ticket.
regards, -- Mike [1] - https://issues.apache.org/jira/browse/NIFI-767 On Fri, Dec 22, 2017 at 1:44 PM, Bryan Bende <bbe...@gmail.com> wrote: > Hello, > > Does your processor happen to have a @TriggerWhenEmpty annotation on it? > > That would cause it to always execute regardless of what is in the queue, > so just wanted to rule that out. > > Thanks, > > Bryan > > > On Fri, Dec 22, 2017 at 12:45 PM, Oleksi Derkatch < > oderka...@vitalimages.com > > wrote: > > > Hi, > > > > > > I've noticed that if the every FlowFile in a queue is penalized, I see > > constant invocations on the processor's onTrigger() method, despite the > > queue being "effectively" empty. This seems to cause millions of > > invocations of the processor that don't result in useful work. > > > > > > Am I understanding the situation correctly? Has anyone ever considered > > changing this behaviour so that we don't have all these calls to > onTrigger > > when the queue only contains penalized flow files? > > > > > > Of course, we can update our Processors to just yield() when they get > > called with a null flow file, but this seems like a good thing for the > > engine to handle automatically. > > > > > > ____________________________________________________________ > > _____________________________________________ > > [image: 1496944291439_image001.png] > > Oleksi Derkatch | Software Engineer > > > > 7 Father David Bauer Drive, Suite 201 > > <https://maps.google.com/?q=7+Father+David+Bauer+Drive,+ > Suite+201%C2%A0%0D+%7C%C2%A0+Waterloo,+ON,+Canada,+N2L+0A2& > entry=gmail&source=g> > > | Waterloo, ON, Canada, N2L 0A2 > > <https://maps.google.com/?q=7+Father+David+Bauer+Drive,+ > Suite+201%C2%A0%0D+%7C%C2%A0+Waterloo,+ON,+Canada,+N2L+0A2& > entry=gmail&source=g> > > > > +1 519 594 0940 ext.212 <(519)%20594-0940> | +1 844 527 6748 > > <(844)%20527-6748> l www.vitalimages.com > > ____________________________________________________________ > > _____________________________________________ > > > > > > > > > > Notice - Confidential Information The information in this communication > > and any attachments is strictly confidential and intended only for the > use > > of the individual(s) or entity(ies) named above. If you are not the > > intended recipient, any dissemination, distribution, copying or other use > > of the information contained in this communication and/or any attachment > is > > strictly prohibited. If you have received this communication in error, > > please first notify the sender immediately and then delete this > > communication from all data storage devices and destroy all hard copies. > > >
