James,
Thanks, excellent!
Now this named counter, /SampleScriptCounter/ here, shows up in the UI
later on somewhere?
Russ
On 12/09/2016 09:15 AM, James Wing wrote:
You can add a custom counter very easily using ExecuteScript:
/* ECMAScript */
flowFile = session.get();
if (flowFile != null) {
session.adjustCounter("SampleScriptCounter", 1, false);
session.transfer(flowFile, REL_SUCCESS);
}
The performance may not be optimal, but you can experiment with counters
immediately.
Thanks,
James
On Fri, Dec 9, 2016 at 7:56 AM, Russell Bateman <[email protected]>
wrote:
Aldrin,
Forgive me for commandeering this thread.
My down-streamers are asking for a custom "counting" processor because of
what from their point of view is an unreliable volatility in the counts
that the UI displays. In particular, they want to know how many documents
they're feeding into our ETL flow and how many they're getting out (at
least, in places where there is a one-to-one expectation which isn't all of
our flows of course). The delta, which they are pretty sure to be non-zero,
would be tantamount to lost/dropped documents. (So, they want me to
manufacture the pistol they intend aiming at my head. ;-) )
Are you saying that ProcessSession provides me, as a custom processor
writer, the ability to do this (ostensibly in already existing custom
processors I've written) in preference to adding yet another dedicated,
custom processor?
As new as NiFi is, great functionality is still hidden behind the fact
that no one's using it and no one's writing about it, giving examples, etc.
I was surprised to read this thread just now and wondered if it's another
cool thing I've missed.
Thanks for any confirmation, other comments, etc.
Russ
On 12/09/2016 08:42 AM, Aldrin Piri wrote:
Hello,
Counters are a framework level item that allows processors to provide
counts on things whilst processing. This functionality must be exercised
via the ProcessSession[1] within a processor's code. To add one, you
would
need to invoke the adjustCounter method in your processor.
[1]
https://github.com/apache/nifi/blob/master/nifi-api/src/main
/java/org/apache/nifi/processor/ProcessSession.java#L161
On Fri, Dec 9, 2016 at 3:40 AM, bingogo1986 <[email protected]> wrote:
hi
I noticed 'Counter' button on top right of Nifi UI ，how to aad a
specified
counter ，thanks.
Best regards.
