Apache Nifi, can I collect an attribute from multiple flow files

I have a nifi flow that takes in .csv files and partitions each into multiple records with each csv column value added as an attribute.

At one point in the flow, I'd like to collect the value of one attribute from each record that passes though. There could be from 0 to n collected. Once I have the list, it'll be emailed out. I'm trying to avoid me (or someone else) getting bombed with emails if there are 200+ bad records in a file. So if I could collect for a fixed period of time or until another attribute (filename) changes, that would be great.

I've tried merge content and record. I even tried replace text to replace the content w/ just the attribute value I want to save and merging those, and a slew of other things.

Is there a simple way to do this in nifi?

https://stackoverflow.com/questions/65922729/apache-nifi-can-i-collect-an-attribute-from-multiple-flow-files January 27, 2021 at 11:56PM