NiFi processor updateAttributes runs too many tasks

[#1]

NiFi processor updateAttributes runs too many tasks, but I just have only one flowfile transfers to it. I wonder why so many tasks are running.

[#2]

[#3 · Accepted solution]

I know why。

when my upstream processor routes to the relation of retry, penalizes the flow file, this causing it to wait 

Penalty Duration(30 seconds).

But,this trigger down processor continuous cycle of data acquisition。