Anil, It sounds like what you are interested in would be some combination of the referenceable process groups  or worm-hole connections , which were ideas that were discussed, but haven't been implemented.
You might be able to make your situation slightly better by using the NiFi Registry instead of templates... As an example, you could design a stand-alone process group for your retry logic and place it under version control in the registry. Then you import this flow from the registry into various points of your overall flow. You could then go back to the original standalone process group and make a change to the logic and save version 2 to the registry. At this point all the other places you imported it to will show an upgrade and you can change their version to v2 to bring in the change. It still requires manual upgrading of all the versioned process groups, but at least they are all tied back to the same version, where as templates are not linked to anything once they instantiated. -Bryan  https://cwiki.apache.org/confluence/display/NIFI/Reference-able+Process+Groups  https://cwiki.apache.org/confluence/display/NIFI/Wormhole+Connections On Tue, Mar 13, 2018 at 10:48 AM, Anil Rai <anilrain...@gmail.com> wrote: > Team, > > My question is around re-use. > Templates : We are creating flows for different use cases. Most of them have > a requirement for retry. Say the API call fails, we would like to retry 3 > time after certain interval before giving up. We have created a retry > template that works perfect. > Q: If I have to use this template, then i have to import this template in > all the use case flows. If we have a change to this template, then i would > be forced to go to every flow that uses this template and make that change. > Date, String, Number formatting : I have seen couple of ways of doing this > formatting. Like in UpdateAttribute, Jolt transformation, ExecuteScript. > Q: Like in Java, can we have this utility in one place that can be used by > all my flows at run time by passing the required Parameters? > > Thanks > Anil > >